diff options
Diffstat (limited to 'third_party/abseil_cpp/absl/memory')
| -rw-r--r-- | third_party/abseil_cpp/absl/memory/BUILD.bazel | 65 | ||||
| -rw-r--r-- | third_party/abseil_cpp/absl/memory/CMakeLists.txt | 55 | ||||
| -rw-r--r-- | third_party/abseil_cpp/absl/memory/memory.h | 699 | ||||
| -rw-r--r-- | third_party/abseil_cpp/absl/memory/memory_exception_safety_test.cc | 57 | ||||
| -rw-r--r-- | third_party/abseil_cpp/absl/memory/memory_test.cc | 650 |
5 files changed, 1526 insertions, 0 deletions
diff --git a/third_party/abseil_cpp/absl/memory/BUILD.bazel b/third_party/abseil_cpp/absl/memory/BUILD.bazel new file mode 100644 index 0000000000..d2824a05ad --- /dev/null +++ b/third_party/abseil_cpp/absl/memory/BUILD.bazel @@ -0,0 +1,65 @@ +# +# Copyright 2019 The Abseil Authors. +# +# Licensed under the Apache License, Version 2.0 (the "License"); +# you may not use this file except in compliance with the License. +# You may obtain a copy of the License at +# +# https://www.apache.org/licenses/LICENSE-2.0 +# +# Unless required by applicable law or agreed to in writing, software +# distributed under the License is distributed on an "AS IS" BASIS, +# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +# See the License for the specific language governing permissions and +# limitations under the License. +# + +load("@rules_cc//cc:defs.bzl", "cc_library", "cc_test") +load( + "//absl:copts/configure_copts.bzl", + "ABSL_DEFAULT_COPTS", + "ABSL_DEFAULT_LINKOPTS", + "ABSL_TEST_COPTS", +) + +package(default_visibility = ["//visibility:public"]) + +licenses(["notice"]) + +cc_library( + name = "memory", + hdrs = ["memory.h"], + copts = ABSL_DEFAULT_COPTS, + linkopts = ABSL_DEFAULT_LINKOPTS, + deps = [ + "//absl/base:core_headers", + "//absl/meta:type_traits", + ], +) + +cc_test( + name = "memory_test", + srcs = ["memory_test.cc"], + copts = ABSL_TEST_COPTS, + linkopts = ABSL_DEFAULT_LINKOPTS, + deps = [ + ":memory", + "//absl/base:core_headers", + "@com_google_googletest//:gtest_main", + ], +) + +cc_test( + name = "memory_exception_safety_test", + srcs = [ + "memory_exception_safety_test.cc", + ], + copts = ABSL_TEST_COPTS, + linkopts = ABSL_DEFAULT_LINKOPTS, + deps = [ + ":memory", + "//absl/base:config", + "//absl/base:exception_safety_testing", + "@com_google_googletest//:gtest_main", + ], +) diff --git a/third_party/abseil_cpp/absl/memory/CMakeLists.txt b/third_party/abseil_cpp/absl/memory/CMakeLists.txt new file mode 100644 index 0000000000..78fb7e1b31 --- /dev/null +++ b/third_party/abseil_cpp/absl/memory/CMakeLists.txt @@ -0,0 +1,55 @@ +# +# Copyright 2017 The Abseil Authors. +# +# Licensed under the Apache License, Version 2.0 (the "License"); +# you may not use this file except in compliance with the License. +# You may obtain a copy of the License at +# +# https://www.apache.org/licenses/LICENSE-2.0 +# +# Unless required by applicable law or agreed to in writing, software +# distributed under the License is distributed on an "AS IS" BASIS, +# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +# See the License for the specific language governing permissions and +# limitations under the License. +# + +absl_cc_library( + NAME + memory + HDRS + "memory.h" + COPTS + ${ABSL_DEFAULT_COPTS} + DEPS + absl::core_headers + absl::meta + PUBLIC +) + +absl_cc_test( + NAME + memory_test + SRCS + "memory_test.cc" + COPTS + ${ABSL_TEST_COPTS} + DEPS + absl::memory + absl::core_headers + gmock_main +) + +absl_cc_test( + NAME + memory_exception_safety_test + SRCS + "memory_exception_safety_test.cc" + COPTS + ${ABSL_TEST_COPTS} + DEPS + absl::memory + absl::config + absl::exception_safety_testing + gmock_main +) diff --git a/third_party/abseil_cpp/absl/memory/memory.h b/third_party/abseil_cpp/absl/memory/memory.h new file mode 100644 index 0000000000..2b5ff623d4 --- /dev/null +++ b/third_party/abseil_cpp/absl/memory/memory.h @@ -0,0 +1,699 @@ +// Copyright 2017 The Abseil Authors. +// +// Licensed under the Apache License, Version 2.0 (the "License"); +// you may not use this file except in compliance with the License. +// You may obtain a copy of the License at +// +// https://www.apache.org/licenses/LICENSE-2.0 +// +// Unless required by applicable law or agreed to in writing, software +// distributed under the License is distributed on an "AS IS" BASIS, +// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +// See the License for the specific language governing permissions and +// limitations under the License. +// +// ----------------------------------------------------------------------------- +// File: memory.h +// ----------------------------------------------------------------------------- +// +// This header file contains utility functions for managing the creation and +// conversion of smart pointers. This file is an extension to the C++ +// standard <memory> library header file. + +#ifndef ABSL_MEMORY_MEMORY_H_ +#define ABSL_MEMORY_MEMORY_H_ + +#include <cstddef> +#include <limits> +#include <memory> +#include <new> +#include <type_traits> +#include <utility> + +#include "absl/base/macros.h" +#include "absl/meta/type_traits.h" + +namespace absl { +ABSL_NAMESPACE_BEGIN + +// ----------------------------------------------------------------------------- +// Function Template: WrapUnique() +// ----------------------------------------------------------------------------- +// +// Adopts ownership from a raw pointer and transfers it to the returned +// `std::unique_ptr`, whose type is deduced. Because of this deduction, *do not* +// specify the template type `T` when calling `WrapUnique`. +// +// Example: +// X* NewX(int, int); +// auto x = WrapUnique(NewX(1, 2)); // 'x' is std::unique_ptr<X>. +// +// Do not call WrapUnique with an explicit type, as in +// `WrapUnique<X>(NewX(1, 2))`. The purpose of WrapUnique is to automatically +// deduce the pointer type. If you wish to make the type explicit, just use +// `std::unique_ptr` directly. +// +// auto x = std::unique_ptr<X>(NewX(1, 2)); +// - or - +// std::unique_ptr<X> x(NewX(1, 2)); +// +// While `absl::WrapUnique` is useful for capturing the output of a raw +// pointer factory, prefer 'absl::make_unique<T>(args...)' over +// 'absl::WrapUnique(new T(args...))'. +// +// auto x = WrapUnique(new X(1, 2)); // works, but nonideal. +// auto x = make_unique<X>(1, 2); // safer, standard, avoids raw 'new'. +// +// Note that `absl::WrapUnique(p)` is valid only if `delete p` is a valid +// expression. In particular, `absl::WrapUnique()` cannot wrap pointers to +// arrays, functions or void, and it must not be used to capture pointers +// obtained from array-new expressions (even though that would compile!). +template <typename T> +std::unique_ptr<T> WrapUnique(T* ptr) { + static_assert(!std::is_array<T>::value, "array types are unsupported"); + static_assert(std::is_object<T>::value, "non-object types are unsupported"); + return std::unique_ptr<T>(ptr); +} + +namespace memory_internal { + +// Traits to select proper overload and return type for `absl::make_unique<>`. +template <typename T> +struct MakeUniqueResult { + using scalar = std::unique_ptr<T>; +}; +template <typename T> +struct MakeUniqueResult<T[]> { + using array = std::unique_ptr<T[]>; +}; +template <typename T, size_t N> +struct MakeUniqueResult<T[N]> { + using invalid = void; +}; + +} // namespace memory_internal + +// gcc 4.8 has __cplusplus at 201301 but the libstdc++ shipped with it doesn't +// define make_unique. Other supported compilers either just define __cplusplus +// as 201103 but have make_unique (msvc), or have make_unique whenever +// __cplusplus > 201103 (clang). +#if (__cplusplus > 201103L || defined(_MSC_VER)) && \ + !(defined(__GLIBCXX__) && !defined(__cpp_lib_make_unique)) +using std::make_unique; +#else +// ----------------------------------------------------------------------------- +// Function Template: make_unique<T>() +// ----------------------------------------------------------------------------- +// +// Creates a `std::unique_ptr<>`, while avoiding issues creating temporaries +// during the construction process. `absl::make_unique<>` also avoids redundant +// type declarations, by avoiding the need to explicitly use the `new` operator. +// +// This implementation of `absl::make_unique<>` is designed for C++11 code and +// will be replaced in C++14 by the equivalent `std::make_unique<>` abstraction. +// `absl::make_unique<>` is designed to be 100% compatible with +// `std::make_unique<>` so that the eventual migration will involve a simple +// rename operation. +// +// For more background on why `std::unique_ptr<T>(new T(a,b))` is problematic, +// see Herb Sutter's explanation on +// (Exception-Safe Function Calls)[https://herbsutter.com/gotw/_102/]. +// (In general, reviewers should treat `new T(a,b)` with scrutiny.) +// +// Example usage: +// +// auto p = make_unique<X>(args...); // 'p' is a std::unique_ptr<X> +// auto pa = make_unique<X[]>(5); // 'pa' is a std::unique_ptr<X[]> +// +// Three overloads of `absl::make_unique` are required: +// +// - For non-array T: +// +// Allocates a T with `new T(std::forward<Args> args...)`, +// forwarding all `args` to T's constructor. +// Returns a `std::unique_ptr<T>` owning that object. +// +// - For an array of unknown bounds T[]: +// +// `absl::make_unique<>` will allocate an array T of type U[] with +// `new U[n]()` and return a `std::unique_ptr<U[]>` owning that array. +// +// Note that 'U[n]()' is different from 'U[n]', and elements will be +// value-initialized. Note as well that `std::unique_ptr` will perform its +// own destruction of the array elements upon leaving scope, even though +// the array [] does not have a default destructor. +// +// NOTE: an array of unknown bounds T[] may still be (and often will be) +// initialized to have a size, and will still use this overload. E.g: +// +// auto my_array = absl::make_unique<int[]>(10); +// +// - For an array of known bounds T[N]: +// +// `absl::make_unique<>` is deleted (like with `std::make_unique<>`) as +// this overload is not useful. +// +// NOTE: an array of known bounds T[N] is not considered a useful +// construction, and may cause undefined behavior in templates. E.g: +// +// auto my_array = absl::make_unique<int[10]>(); +// +// In those cases, of course, you can still use the overload above and +// simply initialize it to its desired size: +// +// auto my_array = absl::make_unique<int[]>(10); + +// `absl::make_unique` overload for non-array types. +template <typename T, typename... Args> +typename memory_internal::MakeUniqueResult<T>::scalar make_unique( + Args&&... args) { + return std::unique_ptr<T>(new T(std::forward<Args>(args)...)); +} + +// `absl::make_unique` overload for an array T[] of unknown bounds. +// The array allocation needs to use the `new T[size]` form and cannot take +// element constructor arguments. The `std::unique_ptr` will manage destructing +// these array elements. +template <typename T> +typename memory_internal::MakeUniqueResult<T>::array make_unique(size_t n) { + return std::unique_ptr<T>(new typename absl::remove_extent_t<T>[n]()); +} + +// `absl::make_unique` overload for an array T[N] of known bounds. +// This construction will be rejected. +template <typename T, typename... Args> +typename memory_internal::MakeUniqueResult<T>::invalid make_unique( + Args&&... /* args */) = delete; +#endif + +// ----------------------------------------------------------------------------- +// Function Template: RawPtr() +// ----------------------------------------------------------------------------- +// +// Extracts the raw pointer from a pointer-like value `ptr`. `absl::RawPtr` is +// useful within templates that need to handle a complement of raw pointers, +// `std::nullptr_t`, and smart pointers. +template <typename T> +auto RawPtr(T&& ptr) -> decltype(std::addressof(*ptr)) { + // ptr is a forwarding reference to support Ts with non-const operators. + return (ptr != nullptr) ? std::addressof(*ptr) : nullptr; +} +inline std::nullptr_t RawPtr(std::nullptr_t) { return nullptr; } + +// ----------------------------------------------------------------------------- +// Function Template: ShareUniquePtr() +// ----------------------------------------------------------------------------- +// +// Adopts a `std::unique_ptr` rvalue and returns a `std::shared_ptr` of deduced +// type. Ownership (if any) of the held value is transferred to the returned +// shared pointer. +// +// Example: +// +// auto up = absl::make_unique<int>(10); +// auto sp = absl::ShareUniquePtr(std::move(up)); // shared_ptr<int> +// CHECK_EQ(*sp, 10); +// CHECK(up == nullptr); +// +// Note that this conversion is correct even when T is an array type, and more +// generally it works for *any* deleter of the `unique_ptr` (single-object +// deleter, array deleter, or any custom deleter), since the deleter is adopted +// by the shared pointer as well. The deleter is copied (unless it is a +// reference). +// +// Implements the resolution of [LWG 2415](http://wg21.link/lwg2415), by which a +// null shared pointer does not attempt to call the deleter. +template <typename T, typename D> +std::shared_ptr<T> ShareUniquePtr(std::unique_ptr<T, D>&& ptr) { + return ptr ? std::shared_ptr<T>(std::move(ptr)) : std::shared_ptr<T>(); +} + +// ----------------------------------------------------------------------------- +// Function Template: WeakenPtr() +// ----------------------------------------------------------------------------- +// +// Creates a weak pointer associated with a given shared pointer. The returned +// value is a `std::weak_ptr` of deduced type. +// +// Example: +// +// auto sp = std::make_shared<int>(10); +// auto wp = absl::WeakenPtr(sp); +// CHECK_EQ(sp.get(), wp.lock().get()); +// sp.reset(); +// CHECK(wp.lock() == nullptr); +// +template <typename T> +std::weak_ptr<T> WeakenPtr(const std::shared_ptr<T>& ptr) { + return std::weak_ptr<T>(ptr); +} + +namespace memory_internal { + +// ExtractOr<E, O, D>::type evaluates to E<O> if possible. Otherwise, D. +template <template <typename> class Extract, typename Obj, typename Default, + typename> +struct ExtractOr { + using type = Default; +}; + +template <template <typename> class Extract, typename Obj, typename Default> +struct ExtractOr<Extract, Obj, Default, void_t<Extract<Obj>>> { + using type = Extract<Obj>; +}; + +template <template <typename> class Extract, typename Obj, typename Default> +using ExtractOrT = typename ExtractOr<Extract, Obj, Default, void>::type; + +// Extractors for the features of allocators. +template <typename T> +using GetPointer = typename T::pointer; + +template <typename T> +using GetConstPointer = typename T::const_pointer; + +template <typename T> +using GetVoidPointer = typename T::void_pointer; + +template <typename T> +using GetConstVoidPointer = typename T::const_void_pointer; + +template <typename T> +using GetDifferenceType = typename T::difference_type; + +template <typename T> +using GetSizeType = typename T::size_type; + +template <typename T> +using GetPropagateOnContainerCopyAssignment = + typename T::propagate_on_container_copy_assignment; + +template <typename T> +using GetPropagateOnContainerMoveAssignment = + typename T::propagate_on_container_move_assignment; + +template <typename T> +using GetPropagateOnContainerSwap = typename T::propagate_on_container_swap; + +template <typename T> +using GetIsAlwaysEqual = typename T::is_always_equal; + +template <typename T> +struct GetFirstArg; + +template <template <typename...> class Class, typename T, typename... Args> +struct GetFirstArg<Class<T, Args...>> { + using type = T; +}; + +template <typename Ptr, typename = void> +struct ElementType { + using type = typename GetFirstArg<Ptr>::type; +}; + +template <typename T> +struct ElementType<T, void_t<typename T::element_type>> { + using type = typename T::element_type; +}; + +template <typename T, typename U> +struct RebindFirstArg; + +template <template <typename...> class Class, typename T, typename... Args, + typename U> +struct RebindFirstArg<Class<T, Args...>, U> { + using type = Class<U, Args...>; +}; + +template <typename T, typename U, typename = void> +struct RebindPtr { + using type = typename RebindFirstArg<T, U>::type; +}; + +template <typename T, typename U> +struct RebindPtr<T, U, void_t<typename T::template rebind<U>>> { + using type = typename T::template rebind<U>; +}; + +template <typename T, typename U> +constexpr bool HasRebindAlloc(...) { + return false; +} + +template <typename T, typename U> +constexpr bool HasRebindAlloc(typename T::template rebind<U>::other*) { + return true; +} + +template <typename T, typename U, bool = HasRebindAlloc<T, U>(nullptr)> +struct RebindAlloc { + using type = typename RebindFirstArg<T, U>::type; +}; + +template <typename T, typename U> +struct RebindAlloc<T, U, true> { + using type = typename T::template rebind<U>::other; +}; + +} // namespace memory_internal + +// ----------------------------------------------------------------------------- +// Class Template: pointer_traits +// ----------------------------------------------------------------------------- +// +// An implementation of C++11's std::pointer_traits. +// +// Provided for portability on toolchains that have a working C++11 compiler, +// but the standard library is lacking in C++11 support. For example, some +// version of the Android NDK. +// + +template <typename Ptr> +struct pointer_traits { + using pointer = Ptr; + + // element_type: + // Ptr::element_type if present. Otherwise T if Ptr is a template + // instantiation Template<T, Args...> + using element_type = typename memory_internal::ElementType<Ptr>::type; + + // difference_type: + // Ptr::difference_type if present, otherwise std::ptrdiff_t + using difference_type = + memory_internal::ExtractOrT<memory_internal::GetDifferenceType, Ptr, + std::ptrdiff_t>; + + // rebind: + // Ptr::rebind<U> if exists, otherwise Template<U, Args...> if Ptr is a + // template instantiation Template<T, Args...> + template <typename U> + using rebind = typename memory_internal::RebindPtr<Ptr, U>::type; + + // pointer_to: + // Calls Ptr::pointer_to(r) + static pointer pointer_to(element_type& r) { // NOLINT(runtime/references) + return Ptr::pointer_to(r); + } +}; + +// Specialization for T*. +template <typename T> +struct pointer_traits<T*> { + using pointer = T*; + using element_type = T; + using difference_type = std::ptrdiff_t; + + template <typename U> + using rebind = U*; + + // pointer_to: + // Calls std::addressof(r) + static pointer pointer_to( + element_type& r) noexcept { // NOLINT(runtime/references) + return std::addressof(r); + } +}; + +// ----------------------------------------------------------------------------- +// Class Template: allocator_traits +// ----------------------------------------------------------------------------- +// +// A C++11 compatible implementation of C++17's std::allocator_traits. +// +#if __cplusplus >= 201703L +using std::allocator_traits; +#else // __cplusplus >= 201703L +template <typename Alloc> +struct allocator_traits { + using allocator_type = Alloc; + + // value_type: + // Alloc::value_type + using value_type = typename Alloc::value_type; + + // pointer: + // Alloc::pointer if present, otherwise value_type* + using pointer = memory_internal::ExtractOrT<memory_internal::GetPointer, + Alloc, value_type*>; + + // const_pointer: + // Alloc::const_pointer if present, otherwise + // absl::pointer_traits<pointer>::rebind<const value_type> + using const_pointer = + memory_internal::ExtractOrT<memory_internal::GetConstPointer, Alloc, + typename absl::pointer_traits<pointer>:: + template rebind<const value_type>>; + + // void_pointer: + // Alloc::void_pointer if present, otherwise + // absl::pointer_traits<pointer>::rebind<void> + using void_pointer = memory_internal::ExtractOrT< + memory_internal::GetVoidPointer, Alloc, + typename absl::pointer_traits<pointer>::template rebind<void>>; + + // const_void_pointer: + // Alloc::const_void_pointer if present, otherwise + // absl::pointer_traits<pointer>::rebind<const void> + using const_void_pointer = memory_internal::ExtractOrT< + memory_internal::GetConstVoidPointer, Alloc, + typename absl::pointer_traits<pointer>::template rebind<const void>>; + + // difference_type: + // Alloc::difference_type if present, otherwise + // absl::pointer_traits<pointer>::difference_type + using difference_type = memory_internal::ExtractOrT< + memory_internal::GetDifferenceType, Alloc, + typename absl::pointer_traits<pointer>::difference_type>; + + // size_type: + // Alloc::size_type if present, otherwise + // std::make_unsigned<difference_type>::type + using size_type = memory_internal::ExtractOrT< + memory_internal::GetSizeType, Alloc, + typename std::make_unsigned<difference_type>::type>; + + // propagate_on_container_copy_assignment: + // Alloc::propagate_on_container_copy_assignment if present, otherwise + // std::false_type + using propagate_on_container_copy_assignment = memory_internal::ExtractOrT< + memory_internal::GetPropagateOnContainerCopyAssignment, Alloc, + std::false_type>; + + // propagate_on_container_move_assignment: + // Alloc::propagate_on_container_move_assignment if present, otherwise + // std::false_type + using propagate_on_container_move_assignment = memory_internal::ExtractOrT< + memory_internal::GetPropagateOnContainerMoveAssignment, Alloc, + std::false_type>; + + // propagate_on_container_swap: + // Alloc::propagate_on_container_swap if present, otherwise std::false_type + using propagate_on_container_swap = + memory_internal::ExtractOrT<memory_internal::GetPropagateOnContainerSwap, + Alloc, std::false_type>; + + // is_always_equal: + // Alloc::is_always_equal if present, otherwise std::is_empty<Alloc>::type + using is_always_equal = + memory_internal::ExtractOrT<memory_internal::GetIsAlwaysEqual, Alloc, + typename std::is_empty<Alloc>::type>; + + // rebind_alloc: + // Alloc::rebind<T>::other if present, otherwise Alloc<T, Args> if this Alloc + // is Alloc<U, Args> + template <typename T> + using rebind_alloc = typename memory_internal::RebindAlloc<Alloc, T>::type; + + // rebind_traits: + // absl::allocator_traits<rebind_alloc<T>> + template <typename T> + using rebind_traits = absl::allocator_traits<rebind_alloc<T>>; + + // allocate(Alloc& a, size_type n): + // Calls a.allocate(n) + static pointer allocate(Alloc& a, // NOLINT(runtime/references) + size_type n) { + return a.allocate(n); + } + + // allocate(Alloc& a, size_type n, const_void_pointer hint): + // Calls a.allocate(n, hint) if possible. + // If not possible, calls a.allocate(n) + static pointer allocate(Alloc& a, size_type n, // NOLINT(runtime/references) + const_void_pointer hint) { + return allocate_impl(0, a, n, hint); + } + + // deallocate(Alloc& a, pointer p, size_type n): + // Calls a.deallocate(p, n) + static void deallocate(Alloc& a, pointer p, // NOLINT(runtime/references) + size_type n) { + a.deallocate(p, n); + } + + // construct(Alloc& a, T* p, Args&&... args): + // Calls a.construct(p, std::forward<Args>(args)...) if possible. + // If not possible, calls + // ::new (static_cast<void*>(p)) T(std::forward<Args>(args)...) + template <typename T, typename... Args> + static void construct(Alloc& a, T* p, // NOLINT(runtime/references) + Args&&... args) { + construct_impl(0, a, p, std::forward<Args>(args)...); + } + + // destroy(Alloc& a, T* p): + // Calls a.destroy(p) if possible. If not possible, calls p->~T(). + template <typename T> + static void destroy(Alloc& a, T* p) { // NOLINT(runtime/references) + destroy_impl(0, a, p); + } + + // max_size(const Alloc& a): + // Returns a.max_size() if possible. If not possible, returns + // std::numeric_limits<size_type>::max() / sizeof(value_type) + static size_type max_size(const Alloc& a) { return max_size_impl(0, a); } + + // select_on_container_copy_construction(const Alloc& a): + // Returns a.select_on_container_copy_construction() if possible. + // If not possible, returns a. + static Alloc select_on_container_copy_construction(const Alloc& a) { + return select_on_container_copy_construction_impl(0, a); + } + + private: + template <typename A> + static auto allocate_impl(int, A& a, // NOLINT(runtime/references) + size_type n, const_void_pointer hint) + -> decltype(a.allocate(n, hint)) { + return a.allocate(n, hint); + } + static pointer allocate_impl(char, Alloc& a, // NOLINT(runtime/references) + size_type n, const_void_pointer) { + return a.allocate(n); + } + + template <typename A, typename... Args> + static auto construct_impl(int, A& a, // NOLINT(runtime/references) + Args&&... args) + -> decltype(a.construct(std::forward<Args>(args)...)) { + a.construct(std::forward<Args>(args)...); + } + + template <typename T, typename... Args> + static void construct_impl(char, Alloc&, T* p, Args&&... args) { + ::new (static_cast<void*>(p)) T(std::forward<Args>(args)...); + } + + template <typename A, typename T> + static auto destroy_impl(int, A& a, // NOLINT(runtime/references) + T* p) -> decltype(a.destroy(p)) { + a.destroy(p); + } + template <typename T> + static void destroy_impl(char, Alloc&, T* p) { + p->~T(); + } + + template <typename A> + static auto max_size_impl(int, const A& a) -> decltype(a.max_size()) { + return a.max_size(); + } + static size_type max_size_impl(char, const Alloc&) { + return (std::numeric_limits<size_type>::max)() / sizeof(value_type); + } + + template <typename A> + static auto select_on_container_copy_construction_impl(int, const A& a) + -> decltype(a.select_on_container_copy_construction()) { + return a.select_on_container_copy_construction(); + } + static Alloc select_on_container_copy_construction_impl(char, + const Alloc& a) { + return a; + } +}; +#endif // __cplusplus >= 201703L + +namespace memory_internal { + +// This template alias transforms Alloc::is_nothrow into a metafunction with +// Alloc as a parameter so it can be used with ExtractOrT<>. +template <typename Alloc> +using GetIsNothrow = typename Alloc::is_nothrow; + +} // namespace memory_internal + +// ABSL_ALLOCATOR_NOTHROW is a build time configuration macro for user to +// specify whether the default allocation function can throw or never throws. +// If the allocation function never throws, user should define it to a non-zero +// value (e.g. via `-DABSL_ALLOCATOR_NOTHROW`). +// If the allocation function can throw, user should leave it undefined or +// define it to zero. +// +// allocator_is_nothrow<Alloc> is a traits class that derives from +// Alloc::is_nothrow if present, otherwise std::false_type. It's specialized +// for Alloc = std::allocator<T> for any type T according to the state of +// ABSL_ALLOCATOR_NOTHROW. +// +// default_allocator_is_nothrow is a class that derives from std::true_type +// when the default allocator (global operator new) never throws, and +// std::false_type when it can throw. It is a convenience shorthand for writing +// allocator_is_nothrow<std::allocator<T>> (T can be any type). +// NOTE: allocator_is_nothrow<std::allocator<T>> is guaranteed to derive from +// the same type for all T, because users should specialize neither +// allocator_is_nothrow nor std::allocator. +template <typename Alloc> +struct allocator_is_nothrow + : memory_internal::ExtractOrT<memory_internal::GetIsNothrow, Alloc, + std::false_type> {}; + +#if defined(ABSL_ALLOCATOR_NOTHROW) && ABSL_ALLOCATOR_NOTHROW +template <typename T> +struct allocator_is_nothrow<std::allocator<T>> : std::true_type {}; +struct default_allocator_is_nothrow : std::true_type {}; +#else +struct default_allocator_is_nothrow : std::false_type {}; +#endif + +namespace memory_internal { +template <typename Allocator, typename Iterator, typename... Args> +void ConstructRange(Allocator& alloc, Iterator first, Iterator last, + const Args&... args) { + for (Iterator cur = first; cur != last; ++cur) { + ABSL_INTERNAL_TRY { + std::allocator_traits<Allocator>::construct(alloc, std::addressof(*cur), + args...); + } + ABSL_INTERNAL_CATCH_ANY { + while (cur != first) { + --cur; + std::allocator_traits<Allocator>::destroy(alloc, std::addressof(*cur)); + } + ABSL_INTERNAL_RETHROW; + } + } +} + +template <typename Allocator, typename Iterator, typename InputIterator> +void CopyRange(Allocator& alloc, Iterator destination, InputIterator first, + InputIterator last) { + for (Iterator cur = destination; first != last; + static_cast<void>(++cur), static_cast<void>(++first)) { + ABSL_INTERNAL_TRY { + std::allocator_traits<Allocator>::construct(alloc, std::addressof(*cur), + *first); + } + ABSL_INTERNAL_CATCH_ANY { + while (cur != destination) { + --cur; + std::allocator_traits<Allocator>::destroy(alloc, std::addressof(*cur)); + } + ABSL_INTERNAL_RETHROW; + } + } +} +} // namespace memory_internal +ABSL_NAMESPACE_END +} // namespace absl + +#endif // ABSL_MEMORY_MEMORY_H_ diff --git a/third_party/abseil_cpp/absl/memory/memory_exception_safety_test.cc b/third_party/abseil_cpp/absl/memory/memory_exception_safety_test.cc new file mode 100644 index 0000000000..1df72614c0 --- /dev/null +++ b/third_party/abseil_cpp/absl/memory/memory_exception_safety_test.cc @@ -0,0 +1,57 @@ +// Copyright 2018 The Abseil Authors. +// +// Licensed under the Apache License, Version 2.0 (the "License"); +// you may not use this file except in compliance with the License. +// You may obtain a copy of the License at +// +// https://www.apache.org/licenses/LICENSE-2.0 +// +// Unless required by applicable law or agreed to in writing, software +// distributed under the License is distributed on an "AS IS" BASIS, +// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +// See the License for the specific language governing permissions and +// limitations under the License. + +#include "absl/memory/memory.h" + +#include "absl/base/config.h" + +#ifdef ABSL_HAVE_EXCEPTIONS + +#include "gtest/gtest.h" +#include "absl/base/internal/exception_safety_testing.h" + +namespace absl { +ABSL_NAMESPACE_BEGIN +namespace { + +constexpr int kLength = 50; +using Thrower = testing::ThrowingValue<testing::TypeSpec::kEverythingThrows>; + +TEST(MakeUnique, CheckForLeaks) { + constexpr int kValue = 321; + auto tester = testing::MakeExceptionSafetyTester() + .WithInitialValue(Thrower(kValue)) + // Ensures make_unique does not modify the input. The real + // test, though, is ConstructorTracker checking for leaks. + .WithContracts(testing::strong_guarantee); + + EXPECT_TRUE(tester.Test([](Thrower* thrower) { + static_cast<void>(absl::make_unique<Thrower>(*thrower)); + })); + + EXPECT_TRUE(tester.Test([](Thrower* thrower) { + static_cast<void>(absl::make_unique<Thrower>(std::move(*thrower))); + })); + + // Test T[n] overload + EXPECT_TRUE(tester.Test([&](Thrower*) { + static_cast<void>(absl::make_unique<Thrower[]>(kLength)); + })); +} + +} // namespace +ABSL_NAMESPACE_END +} // namespace absl + +#endif // ABSL_HAVE_EXCEPTIONS diff --git a/third_party/abseil_cpp/absl/memory/memory_test.cc b/third_party/abseil_cpp/absl/memory/memory_test.cc new file mode 100644 index 0000000000..1990c7ba47 --- /dev/null +++ b/third_party/abseil_cpp/absl/memory/memory_test.cc @@ -0,0 +1,650 @@ +// Copyright 2017 The Abseil Authors. +// +// Licensed under the Apache License, Version 2.0 (the "License"); +// you may not use this file except in compliance with the License. +// You may obtain a copy of the License at +// +// https://www.apache.org/licenses/LICENSE-2.0 +// +// Unless required by applicable law or agreed to in writing, software +// distributed under the License is distributed on an "AS IS" BASIS, +// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. +// See the License for the specific language governing permissions and +// limitations under the License. + +// Tests for pointer utilities. + +#include "absl/memory/memory.h" + +#include <sys/types.h> + +#include <cstddef> +#include <memory> +#include <string> +#include <type_traits> +#include <utility> +#include <vector> + +#include "gmock/gmock.h" +#include "gtest/gtest.h" + +namespace { + +using ::testing::ElementsAre; +using ::testing::Return; + +// This class creates observable behavior to verify that a destructor has +// been called, via the instance_count variable. +class DestructorVerifier { + public: + DestructorVerifier() { ++instance_count_; } + DestructorVerifier(const DestructorVerifier&) = delete; + DestructorVerifier& operator=(const DestructorVerifier&) = delete; + ~DestructorVerifier() { --instance_count_; } + + // The number of instances of this class currently active. + static int instance_count() { return instance_count_; } + + private: + // The number of instances of this class currently active. + static int instance_count_; +}; + +int DestructorVerifier::instance_count_ = 0; + +TEST(WrapUniqueTest, WrapUnique) { + // Test that the unique_ptr is constructed properly by verifying that the + // destructor for its payload gets called at the proper time. + { + auto dv = new DestructorVerifier; + EXPECT_EQ(1, DestructorVerifier::instance_count()); + std::unique_ptr<DestructorVerifier> ptr = absl::WrapUnique(dv); + EXPECT_EQ(1, DestructorVerifier::instance_count()); + } + EXPECT_EQ(0, DestructorVerifier::instance_count()); +} +TEST(MakeUniqueTest, Basic) { + std::unique_ptr<std::string> p = absl::make_unique<std::string>(); + EXPECT_EQ("", *p); + p = absl::make_unique<std::string>("hi"); + EXPECT_EQ("hi", *p); +} + +// InitializationVerifier fills in a pattern when allocated so we can +// distinguish between its default and value initialized states (without +// accessing truly uninitialized memory). +struct InitializationVerifier { + static constexpr int kDefaultScalar = 0x43; + static constexpr int kDefaultArray = 0x4B; + + static void* operator new(size_t n) { + void* ret = ::operator new(n); + memset(ret, kDefaultScalar, n); + return ret; + } + + static void* operator new[](size_t n) { + void* ret = ::operator new[](n); + memset(ret, kDefaultArray, n); + return ret; + } + + int a; + int b; +}; + +TEST(Initialization, MakeUnique) { + auto p = absl::make_unique<InitializationVerifier>(); + + EXPECT_EQ(0, p->a); + EXPECT_EQ(0, p->b); +} + +TEST(Initialization, MakeUniqueArray) { + auto p = absl::make_unique<InitializationVerifier[]>(2); + + EXPECT_EQ(0, p[0].a); + EXPECT_EQ(0, p[0].b); + EXPECT_EQ(0, p[1].a); + EXPECT_EQ(0, p[1].b); +} + +struct MoveOnly { + MoveOnly() = default; + explicit MoveOnly(int i1) : ip1{new int{i1}} {} + MoveOnly(int i1, int i2) : ip1{new int{i1}}, ip2{new int{i2}} {} + std::unique_ptr<int> ip1; + std::unique_ptr<int> ip2; +}; + +struct AcceptMoveOnly { + explicit AcceptMoveOnly(MoveOnly m) : m_(std::move(m)) {} + MoveOnly m_; +}; + +TEST(MakeUniqueTest, MoveOnlyTypeAndValue) { + using ExpectedType = std::unique_ptr<MoveOnly>; + { + auto p = absl::make_unique<MoveOnly>(); + static_assert(std::is_same<decltype(p), ExpectedType>::value, + "unexpected return type"); + EXPECT_TRUE(!p->ip1); + EXPECT_TRUE(!p->ip2); + } + { + auto p = absl::make_unique<MoveOnly>(1); + static_assert(std::is_same<decltype(p), ExpectedType>::value, + "unexpected return type"); + EXPECT_TRUE(p->ip1 && *p->ip1 == 1); + EXPECT_TRUE(!p->ip2); + } + { + auto p = absl::make_unique<MoveOnly>(1, 2); + static_assert(std::is_same<decltype(p), ExpectedType>::value, + "unexpected return type"); + EXPECT_TRUE(p->ip1 && *p->ip1 == 1); + EXPECT_TRUE(p->ip2 && *p->ip2 == 2); + } +} + +TEST(MakeUniqueTest, AcceptMoveOnly) { + auto p = absl::make_unique<AcceptMoveOnly>(MoveOnly()); + p = std::unique_ptr<AcceptMoveOnly>(new AcceptMoveOnly(MoveOnly())); +} + +struct ArrayWatch { + void* operator new[](size_t n) { + allocs().push_back(n); + return ::operator new[](n); + } + void operator delete[](void* p) { return ::operator delete[](p); } + static std::vector<size_t>& allocs() { + static auto& v = *new std::vector<size_t>; + return v; + } +}; + +TEST(Make_UniqueTest, Array) { + // Ensure state is clean before we start so that these tests + // are order-agnostic. + ArrayWatch::allocs().clear(); + + auto p = absl::make_unique<ArrayWatch[]>(5); + static_assert(std::is_same<decltype(p), std::unique_ptr<ArrayWatch[]>>::value, + "unexpected return type"); + EXPECT_THAT(ArrayWatch::allocs(), ElementsAre(5 * sizeof(ArrayWatch))); +} + +TEST(Make_UniqueTest, NotAmbiguousWithStdMakeUnique) { + // Ensure that absl::make_unique is not ambiguous with std::make_unique. + // In C++14 mode, the below call to make_unique has both types as candidates. + struct TakesStdType { + explicit TakesStdType(const std::vector<int>& vec) {} + }; + using absl::make_unique; + (void)make_unique<TakesStdType>(std::vector<int>()); +} + +#if 0 +// These tests shouldn't compile. +TEST(MakeUniqueTestNC, AcceptMoveOnlyLvalue) { + auto m = MoveOnly(); + auto p = absl::make_unique<AcceptMoveOnly>(m); +} +TEST(MakeUniqueTestNC, KnownBoundArray) { + auto p = absl::make_unique<ArrayWatch[5]>(); +} +#endif + +TEST(RawPtrTest, RawPointer) { + int i = 5; + EXPECT_EQ(&i, absl::RawPtr(&i)); +} + +TEST(RawPtrTest, SmartPointer) { + int* o = new int(5); + std::unique_ptr<int> p(o); + EXPECT_EQ(o, absl::RawPtr(p)); +} + +class IntPointerNonConstDeref { + public: + explicit IntPointerNonConstDeref(int* p) : p_(p) {} + friend bool operator!=(const IntPointerNonConstDeref& a, std::nullptr_t) { + return a.p_ != nullptr; + } + int& operator*() { return *p_; } + + private: + std::unique_ptr<int> p_; +}; + +TEST(RawPtrTest, SmartPointerNonConstDereference) { + int* o = new int(5); + IntPointerNonConstDeref p(o); + EXPECT_EQ(o, absl::RawPtr(p)); +} + +TEST(RawPtrTest, NullValuedRawPointer) { + int* p = nullptr; + EXPECT_EQ(nullptr, absl::RawPtr(p)); +} + +TEST(RawPtrTest, NullValuedSmartPointer) { + std::unique_ptr<int> p; + EXPECT_EQ(nullptr, absl::RawPtr(p)); +} + +TEST(RawPtrTest, Nullptr) { + auto p = absl::RawPtr(nullptr); + EXPECT_TRUE((std::is_same<std::nullptr_t, decltype(p)>::value)); + EXPECT_EQ(nullptr, p); +} + +TEST(RawPtrTest, Null) { + auto p = absl::RawPtr(nullptr); + EXPECT_TRUE((std::is_same<std::nullptr_t, decltype(p)>::value)); + EXPECT_EQ(nullptr, p); +} + +TEST(RawPtrTest, Zero) { + auto p = absl::RawPtr(nullptr); + EXPECT_TRUE((std::is_same<std::nullptr_t, decltype(p)>::value)); + EXPECT_EQ(nullptr, p); +} + +TEST(ShareUniquePtrTest, Share) { + auto up = absl::make_unique<int>(); + int* rp = up.get(); + auto sp = absl::ShareUniquePtr(std::move(up)); + EXPECT_EQ(sp.get(), rp); +} + +TEST(ShareUniquePtrTest, ShareNull) { + struct NeverDie { + using pointer = void*; + void operator()(pointer) { + ASSERT_TRUE(false) << "Deleter should not have been called."; + } + }; + + std::unique_ptr<void, NeverDie> up; + auto sp = absl::ShareUniquePtr(std::move(up)); +} + +TEST(WeakenPtrTest, Weak) { + auto sp = std::make_shared<int>(); + auto wp = absl::WeakenPtr(sp); + EXPECT_EQ(sp.get(), wp.lock().get()); + sp.reset(); + EXPECT_TRUE(wp.expired()); +} + +// Should not compile. +/* +TEST(RawPtrTest, NotAPointer) { + absl::RawPtr(1.5); +} +*/ + +template <typename T> +struct SmartPointer { + using difference_type = char; +}; + +struct PointerWith { + using element_type = int32_t; + using difference_type = int16_t; + template <typename U> + using rebind = SmartPointer<U>; + + static PointerWith pointer_to( + element_type& r) { // NOLINT(runtime/references) + return PointerWith{&r}; + } + + element_type* ptr; +}; + +template <typename... Args> +struct PointerWithout {}; + +TEST(PointerTraits, Types) { + using TraitsWith = absl::pointer_traits<PointerWith>; + EXPECT_TRUE((std::is_same<TraitsWith::pointer, PointerWith>::value)); + EXPECT_TRUE((std::is_same<TraitsWith::element_type, int32_t>::value)); + EXPECT_TRUE((std::is_same<TraitsWith::difference_type, int16_t>::value)); + EXPECT_TRUE(( + std::is_same<TraitsWith::rebind<int64_t>, SmartPointer<int64_t>>::value)); + + using TraitsWithout = absl::pointer_traits<PointerWithout<double, int>>; + EXPECT_TRUE((std::is_same<TraitsWithout::pointer, + PointerWithout<double, int>>::value)); + EXPECT_TRUE((std::is_same<TraitsWithout::element_type, double>::value)); + EXPECT_TRUE( + (std::is_same<TraitsWithout ::difference_type, std::ptrdiff_t>::value)); + EXPECT_TRUE((std::is_same<TraitsWithout::rebind<int64_t>, + PointerWithout<int64_t, int>>::value)); + + using TraitsRawPtr = absl::pointer_traits<char*>; + EXPECT_TRUE((std::is_same<TraitsRawPtr::pointer, char*>::value)); + EXPECT_TRUE((std::is_same<TraitsRawPtr::element_type, char>::value)); + EXPECT_TRUE( + (std::is_same<TraitsRawPtr::difference_type, std::ptrdiff_t>::value)); + EXPECT_TRUE((std::is_same<TraitsRawPtr::rebind<int64_t>, int64_t*>::value)); +} + +TEST(PointerTraits, Functions) { + int i; + EXPECT_EQ(&i, absl::pointer_traits<PointerWith>::pointer_to(i).ptr); + EXPECT_EQ(&i, absl::pointer_traits<int*>::pointer_to(i)); +} + +TEST(AllocatorTraits, Typedefs) { + struct A { + struct value_type {}; + }; + EXPECT_TRUE(( + std::is_same<A, + typename absl::allocator_traits<A>::allocator_type>::value)); + EXPECT_TRUE( + (std::is_same<A::value_type, + typename absl::allocator_traits<A>::value_type>::value)); + + struct X {}; + struct HasPointer { + using value_type = X; + using pointer = SmartPointer<X>; + }; + EXPECT_TRUE((std::is_same<SmartPointer<X>, typename absl::allocator_traits< + HasPointer>::pointer>::value)); + EXPECT_TRUE( + (std::is_same<A::value_type*, + typename absl::allocator_traits<A>::pointer>::value)); + + EXPECT_TRUE( + (std::is_same< + SmartPointer<const X>, + typename absl::allocator_traits<HasPointer>::const_pointer>::value)); + EXPECT_TRUE( + (std::is_same<const A::value_type*, + typename absl::allocator_traits<A>::const_pointer>::value)); + + struct HasVoidPointer { + using value_type = X; + struct void_pointer {}; + }; + + EXPECT_TRUE((std::is_same<HasVoidPointer::void_pointer, + typename absl::allocator_traits< + HasVoidPointer>::void_pointer>::value)); + EXPECT_TRUE( + (std::is_same<SmartPointer<void>, typename absl::allocator_traits< + HasPointer>::void_pointer>::value)); + + struct HasConstVoidPointer { + using value_type = X; + struct const_void_pointer {}; + }; + + EXPECT_TRUE( + (std::is_same<HasConstVoidPointer::const_void_pointer, + typename absl::allocator_traits< + HasConstVoidPointer>::const_void_pointer>::value)); + EXPECT_TRUE((std::is_same<SmartPointer<const void>, + typename absl::allocator_traits< + HasPointer>::const_void_pointer>::value)); + + struct HasDifferenceType { + using value_type = X; + using difference_type = int; + }; + EXPECT_TRUE( + (std::is_same<int, typename absl::allocator_traits< + HasDifferenceType>::difference_type>::value)); + EXPECT_TRUE((std::is_same<char, typename absl::allocator_traits< + HasPointer>::difference_type>::value)); + + struct HasSizeType { + using value_type = X; + using size_type = unsigned int; + }; + EXPECT_TRUE((std::is_same<unsigned int, typename absl::allocator_traits< + HasSizeType>::size_type>::value)); + EXPECT_TRUE((std::is_same<unsigned char, typename absl::allocator_traits< + HasPointer>::size_type>::value)); + + struct HasPropagateOnCopy { + using value_type = X; + struct propagate_on_container_copy_assignment {}; + }; + + EXPECT_TRUE( + (std::is_same<HasPropagateOnCopy::propagate_on_container_copy_assignment, + typename absl::allocator_traits<HasPropagateOnCopy>:: + propagate_on_container_copy_assignment>::value)); + EXPECT_TRUE( + (std::is_same<std::false_type, + typename absl::allocator_traits< + A>::propagate_on_container_copy_assignment>::value)); + + struct HasPropagateOnMove { + using value_type = X; + struct propagate_on_container_move_assignment {}; + }; + + EXPECT_TRUE( + (std::is_same<HasPropagateOnMove::propagate_on_container_move_assignment, + typename absl::allocator_traits<HasPropagateOnMove>:: + propagate_on_container_move_assignment>::value)); + EXPECT_TRUE( + (std::is_same<std::false_type, + typename absl::allocator_traits< + A>::propagate_on_container_move_assignment>::value)); + + struct HasPropagateOnSwap { + using value_type = X; + struct propagate_on_container_swap {}; + }; + + EXPECT_TRUE( + (std::is_same<HasPropagateOnSwap::propagate_on_container_swap, + typename absl::allocator_traits<HasPropagateOnSwap>:: + propagate_on_container_swap>::value)); + EXPECT_TRUE( + (std::is_same<std::false_type, typename absl::allocator_traits<A>:: + propagate_on_container_swap>::value)); + + struct HasIsAlwaysEqual { + using value_type = X; + struct is_always_equal {}; + }; + + EXPECT_TRUE((std::is_same<HasIsAlwaysEqual::is_always_equal, + typename absl::allocator_traits< + HasIsAlwaysEqual>::is_always_equal>::value)); + EXPECT_TRUE((std::is_same<std::true_type, typename absl::allocator_traits< + A>::is_always_equal>::value)); + struct NonEmpty { + using value_type = X; + int i; + }; + EXPECT_TRUE( + (std::is_same<std::false_type, + absl::allocator_traits<NonEmpty>::is_always_equal>::value)); +} + +template <typename T> +struct AllocWithPrivateInheritance : private std::allocator<T> { + using value_type = T; +}; + +TEST(AllocatorTraits, RebindWithPrivateInheritance) { + // Regression test for some versions of gcc that do not like the sfinae we + // used in combination with private inheritance. + EXPECT_TRUE( + (std::is_same<AllocWithPrivateInheritance<int>, + absl::allocator_traits<AllocWithPrivateInheritance<char>>:: + rebind_alloc<int>>::value)); +} + +template <typename T> +struct Rebound {}; + +struct AllocWithRebind { + using value_type = int; + template <typename T> + struct rebind { + using other = Rebound<T>; + }; +}; + +template <typename T, typename U> +struct AllocWithoutRebind { + using value_type = int; +}; + +TEST(AllocatorTraits, Rebind) { + EXPECT_TRUE( + (std::is_same<Rebound<int>, + typename absl::allocator_traits< + AllocWithRebind>::template rebind_alloc<int>>::value)); + EXPECT_TRUE( + (std::is_same<absl::allocator_traits<Rebound<int>>, + typename absl::allocator_traits< + AllocWithRebind>::template rebind_traits<int>>::value)); + + EXPECT_TRUE( + (std::is_same<AllocWithoutRebind<double, char>, + typename absl::allocator_traits<AllocWithoutRebind< + int, char>>::template rebind_alloc<double>>::value)); + EXPECT_TRUE( + (std::is_same<absl::allocator_traits<AllocWithoutRebind<double, char>>, + typename absl::allocator_traits<AllocWithoutRebind< + int, char>>::template rebind_traits<double>>::value)); +} + +struct TestValue { + TestValue() {} + explicit TestValue(int* trace) : trace(trace) { ++*trace; } + ~TestValue() { + if (trace) --*trace; + } + int* trace = nullptr; +}; + +struct MinimalMockAllocator { + MinimalMockAllocator() : value(0) {} + explicit MinimalMockAllocator(int value) : value(value) {} + MinimalMockAllocator(const MinimalMockAllocator& other) + : value(other.value) {} + using value_type = TestValue; + MOCK_METHOD(value_type*, allocate, (size_t)); + MOCK_METHOD(void, deallocate, (value_type*, size_t)); + + int value; +}; + +TEST(AllocatorTraits, FunctionsMinimal) { + int trace = 0; + int hint; + TestValue x(&trace); + MinimalMockAllocator mock; + using Traits = absl::allocator_traits<MinimalMockAllocator>; + EXPECT_CALL(mock, allocate(7)).WillRepeatedly(Return(&x)); + EXPECT_CALL(mock, deallocate(&x, 7)); + + EXPECT_EQ(&x, Traits::allocate(mock, 7)); + static_cast<void>(Traits::allocate(mock, 7, static_cast<const void*>(&hint))); + EXPECT_EQ(&x, Traits::allocate(mock, 7, static_cast<const void*>(&hint))); + Traits::deallocate(mock, &x, 7); + + EXPECT_EQ(1, trace); + Traits::construct(mock, &x, &trace); + EXPECT_EQ(2, trace); + Traits::destroy(mock, &x); + EXPECT_EQ(1, trace); + + EXPECT_EQ(std::numeric_limits<size_t>::max() / sizeof(TestValue), + Traits::max_size(mock)); + + EXPECT_EQ(0, mock.value); + EXPECT_EQ(0, Traits::select_on_container_copy_construction(mock).value); +} + +struct FullMockAllocator { + FullMockAllocator() : value(0) {} + explicit FullMockAllocator(int value) : value(value) {} + FullMockAllocator(const FullMockAllocator& other) : value(other.value) {} + using value_type = TestValue; + MOCK_METHOD(value_type*, allocate, (size_t)); + MOCK_METHOD(value_type*, allocate, (size_t, const void*)); + MOCK_METHOD(void, construct, (value_type*, int*)); + MOCK_METHOD(void, destroy, (value_type*)); + MOCK_METHOD(size_t, max_size, (), + (const)); + MOCK_METHOD(FullMockAllocator, select_on_container_copy_construction, (), + (const)); + + int value; +}; + +TEST(AllocatorTraits, FunctionsFull) { + int trace = 0; + int hint; + TestValue x(&trace), y; + FullMockAllocator mock; + using Traits = absl::allocator_traits<FullMockAllocator>; + EXPECT_CALL(mock, allocate(7)).WillRepeatedly(Return(&x)); + EXPECT_CALL(mock, allocate(13, &hint)).WillRepeatedly(Return(&y)); + EXPECT_CALL(mock, construct(&x, &trace)); + EXPECT_CALL(mock, destroy(&x)); + EXPECT_CALL(mock, max_size()).WillRepeatedly(Return(17)); + EXPECT_CALL(mock, select_on_container_copy_construction()) + .WillRepeatedly(Return(FullMockAllocator(23))); + + EXPECT_EQ(&x, Traits::allocate(mock, 7)); + EXPECT_EQ(&y, Traits::allocate(mock, 13, static_cast<const void*>(&hint))); + + EXPECT_EQ(1, trace); + Traits::construct(mock, &x, &trace); + EXPECT_EQ(1, trace); + Traits::destroy(mock, &x); + EXPECT_EQ(1, trace); + + EXPECT_EQ(17, Traits::max_size(mock)); + + EXPECT_EQ(0, mock.value); + EXPECT_EQ(23, Traits::select_on_container_copy_construction(mock).value); +} + +TEST(AllocatorNoThrowTest, DefaultAllocator) { +#if defined(ABSL_ALLOCATOR_NOTHROW) && ABSL_ALLOCATOR_NOTHROW + EXPECT_TRUE(absl::default_allocator_is_nothrow::value); +#else + EXPECT_FALSE(absl::default_allocator_is_nothrow::value); +#endif +} + +TEST(AllocatorNoThrowTest, StdAllocator) { +#if defined(ABSL_ALLOCATOR_NOTHROW) && ABSL_ALLOCATOR_NOTHROW + EXPECT_TRUE(absl::allocator_is_nothrow<std::allocator<int>>::value); +#else + EXPECT_FALSE(absl::allocator_is_nothrow<std::allocator<int>>::value); +#endif +} + +TEST(AllocatorNoThrowTest, CustomAllocator) { + struct NoThrowAllocator { + using is_nothrow = std::true_type; + }; + struct CanThrowAllocator { + using is_nothrow = std::false_type; + }; + struct UnspecifiedAllocator {}; + EXPECT_TRUE(absl::allocator_is_nothrow<NoThrowAllocator>::value); + EXPECT_FALSE(absl::allocator_is_nothrow<CanThrowAllocator>::value); + EXPECT_FALSE(absl::allocator_is_nothrow<UnspecifiedAllocator>::value); +} + +} // namespace |