diff options
author | Abseil Team <absl-team@google.com> | 2019-08-05T18·32-0700 |
---|---|---|
committer | vslashg <gfalcon@google.com> | 2019-08-05T19·42-0400 |
commit | c5c4db4f5191fe5e76cbf68dcc71fb28702f7d2b (patch) | |
tree | a5f5c13c9a239ac01d0f7b5280e71d1b2a641307 /absl/meta/type_traits.h | |
parent | 14550beb3b7b97195e483fb74b5efb906395c31e (diff) |
Export of internal Abseil changes
-- f8fe0f483378c7520d8f8bdfabe4b20de4d96c7e by Andy Soffer <asoffer@google.com>: Ensure that Invoke can support C++17 in the sense that noexcept is part of the type. PiperOrigin-RevId: 261730155 -- bf796ab71653a80498f9374bc8c5111d065c64ba by Abseil Team <absl-team@google.com>: Fix typo in static_assert message for copy/move constructible by replacing "by" with "be". PiperOrigin-RevId: 261713992 -- 8c7c17c40d03a322f304a2fd73ed34462dbf265a by Andy Soffer <asoffer@google.com>: Add absl::is_function drop-in replacement for std::is_function. Some standard libraries incorrectly implement std::is_function in a few corner cases. In particular, libstdc++ functions marked noexcept. The trick being used here is that function types decay to pointers. After excluding cases like is_class, etc, we can distinguish function types by testing for this decay. Many thanks to ericwf@ for essentially writing this CL. PiperOrigin-RevId: 261705008 -- c5adf42d0a132c2525d17a719329eab2ffe0aa94 by Abseil Team <absl-team@google.com>: Add microbenchmark for StrSplit that uses delimiter ByAnyChar. PiperOrigin-RevId: 261424010 -- 66a342f9381ec56be2fe3aa5b3193dd3538a9740 by Andy Soffer <asoffer@google.com>: CMake support for Abseil Random This change touches almost build-related files for CMake almost exclusively. The one minor exception is random/internal/salted_seed_seq.h. The default warnings configuration for one of our CI builds requests not having named but unused parameters. The change in this file cleans up that warning. PiperOrigin-RevId: 261192369 GitOrigin-RevId: f8fe0f483378c7520d8f8bdfabe4b20de4d96c7e Change-Id: I05f662baacfe78750651535aa658f61c2327bc44
Diffstat (limited to 'absl/meta/type_traits.h')
-rw-r--r-- | absl/meta/type_traits.h | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/absl/meta/type_traits.h b/absl/meta/type_traits.h index c08e3754689b..927244e09dfb 100644 --- a/absl/meta/type_traits.h +++ b/absl/meta/type_traits.h @@ -224,6 +224,23 @@ struct disjunction<> : std::false_type {}; template <typename T> struct negation : std::integral_constant<bool, !T::value> {}; +// is_function() +// +// Determines whether the passed type `T` is a function type. +// +// This metafunction is designed to be a drop-in replacement for the C++11 +// `std::is_function()` metafunction for platforms that have incomplete C++11 +// support (such as libstdc++ 4.x). +// +// This metafunction works because appending `const` to a type does nothing to +// function types and reference types (and forms a const-qualified type +// otherwise). +template <typename T> +struct is_function + : std::integral_constant< + bool, !(std::is_reference<T>::value || + std::is_const<typename std::add_const<T>::type>::value)> {}; + // is_trivially_destructible() // // Determines whether the passed type `T` is trivially destructable. |