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-rw-r--r--absl/types/BUILD.bazel7
-rw-r--r--absl/types/CMakeLists.txt2
-rw-r--r--absl/types/internal/span.h126
-rw-r--r--absl/types/span.h100
4 files changed, 136 insertions, 99 deletions
diff --git a/absl/types/BUILD.bazel b/absl/types/BUILD.bazel
index a62522e469dd..feac34b1c9f9 100644
--- a/absl/types/BUILD.bazel
+++ b/absl/types/BUILD.bazel
@@ -117,7 +117,12 @@ cc_test(
 
 cc_library(
     name = "span",
-    hdrs = ["span.h"],
+    srcs = [
+        "internal/span.h",
+    ],
+    hdrs = [
+        "span.h",
+    ],
     copts = ABSL_DEFAULT_COPTS,
     linkopts = ABSL_DEFAULT_LINKOPTS,
     deps = [
diff --git a/absl/types/CMakeLists.txt b/absl/types/CMakeLists.txt
index 910c099a94ab..56f9fffd6f92 100644
--- a/absl/types/CMakeLists.txt
+++ b/absl/types/CMakeLists.txt
@@ -114,6 +114,8 @@ absl_cc_library(
     span
   HDRS
     "span.h"
+  SRCS
+    "internal/span.h"
   COPTS
     ${ABSL_DEFAULT_COPTS}
   DEPS
diff --git a/absl/types/internal/span.h b/absl/types/internal/span.h
new file mode 100644
index 000000000000..d203aad59165
--- /dev/null
+++ b/absl/types/internal/span.h
@@ -0,0 +1,126 @@
+//
+// 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.
+//
+#ifndef ABSL_TYPES_INTERNAL_SPAN_H_
+#define ABSL_TYPES_INTERNAL_SPAN_H_
+
+#include <algorithm>
+#include <cstddef>
+#include <string>
+#include <type_traits>
+
+#include "absl/algorithm/algorithm.h"
+#include "absl/base/internal/throw_delegate.h"
+#include "absl/meta/type_traits.h"
+
+namespace absl {
+
+namespace span_internal {
+// A constexpr min function
+constexpr size_t Min(size_t a, size_t b) noexcept { return a < b ? a : b; }
+
+// Wrappers for access to container data pointers.
+template <typename C>
+constexpr auto GetDataImpl(C& c, char) noexcept  // NOLINT(runtime/references)
+    -> decltype(c.data()) {
+  return c.data();
+}
+
+// Before C++17, std::string::data returns a const char* in all cases.
+inline char* GetDataImpl(std::string& s,  // NOLINT(runtime/references)
+                         int) noexcept {
+  return &s[0];
+}
+
+template <typename C>
+constexpr auto GetData(C& c) noexcept  // NOLINT(runtime/references)
+    -> decltype(GetDataImpl(c, 0)) {
+  return GetDataImpl(c, 0);
+}
+
+// Detection idioms for size() and data().
+template <typename C>
+using HasSize =
+    std::is_integral<absl::decay_t<decltype(std::declval<C&>().size())>>;
+
+// We want to enable conversion from vector<T*> to Span<const T* const> but
+// disable conversion from vector<Derived> to Span<Base>. Here we use
+// the fact that U** is convertible to Q* const* if and only if Q is the same
+// type or a more cv-qualified version of U.  We also decay the result type of
+// data() to avoid problems with classes which have a member function data()
+// which returns a reference.
+template <typename T, typename C>
+using HasData =
+    std::is_convertible<absl::decay_t<decltype(GetData(std::declval<C&>()))>*,
+                        T* const*>;
+
+// Extracts value type from a Container
+template <typename C>
+struct ElementType {
+  using type = typename absl::remove_reference_t<C>::value_type;
+};
+
+template <typename T, size_t N>
+struct ElementType<T (&)[N]> {
+  using type = T;
+};
+
+template <typename C>
+using ElementT = typename ElementType<C>::type;
+
+template <typename T>
+using EnableIfMutable =
+    typename std::enable_if<!std::is_const<T>::value, int>::type;
+
+template <template <typename> class SpanT, typename T>
+bool EqualImpl(SpanT<T> a, SpanT<T> b) {
+  static_assert(std::is_const<T>::value, "");
+  return absl::equal(a.begin(), a.end(), b.begin(), b.end());
+}
+
+template <template <typename> class SpanT, typename T>
+bool LessThanImpl(SpanT<T> a, SpanT<T> b) {
+  // We can't use value_type since that is remove_cv_t<T>, so we go the long way
+  // around.
+  static_assert(std::is_const<T>::value, "");
+  return std::lexicographical_compare(a.begin(), a.end(), b.begin(), b.end());
+}
+
+// The `IsConvertible` classes here are needed because of the
+// `std::is_convertible` bug in libcxx when compiled with GCC. This build
+// configuration is used by Android NDK toolchain. Reference link:
+// https://bugs.llvm.org/show_bug.cgi?id=27538.
+template <typename From, typename To>
+struct IsConvertibleHelper {
+ private:
+  static std::true_type testval(To);
+  static std::false_type testval(...);
+
+ public:
+  using type = decltype(testval(std::declval<From>()));
+};
+
+template <typename From, typename To>
+struct IsConvertible : IsConvertibleHelper<From, To>::type {};
+
+// TODO(zhangxy): replace `IsConvertible` with `std::is_convertible` once the
+// older version of libcxx is not supported.
+template <typename From, typename To>
+using EnableIfConvertibleTo =
+    typename std::enable_if<IsConvertible<From, To>::value>::type;
+}  // namespace span_internal
+}  // namespace absl
+
+#endif  // ABSL_TYPES_INTERNAL_SPAN_H_
diff --git a/absl/types/span.h b/absl/types/span.h
index e5c4fe1e4dc2..b007fc1fd3df 100644
--- a/absl/types/span.h
+++ b/absl/types/span.h
@@ -60,114 +60,18 @@
 #include <cstddef>
 #include <initializer_list>
 #include <iterator>
-#include <string>
 #include <type_traits>
 #include <utility>
 
-#include "absl/algorithm/algorithm.h"
 #include "absl/base/internal/throw_delegate.h"
 #include "absl/base/macros.h"
 #include "absl/base/optimization.h"
-#include "absl/base/port.h"
+#include "absl/base/port.h"    // TODO(strel): remove this include
 #include "absl/meta/type_traits.h"
+#include "absl/types/internal/span.h"
 
 namespace absl {
 
-namespace span_internal {
-// A constexpr min function
-constexpr size_t Min(size_t a, size_t b) noexcept { return a < b ? a : b; }
-
-// Wrappers for access to container data pointers.
-template <typename C>
-constexpr auto GetDataImpl(C& c, char) noexcept  // NOLINT(runtime/references)
-    -> decltype(c.data()) {
-  return c.data();
-}
-
-// Before C++17, std::string::data returns a const char* in all cases.
-inline char* GetDataImpl(std::string& s,  // NOLINT(runtime/references)
-                         int) noexcept {
-  return &s[0];
-}
-
-template <typename C>
-constexpr auto GetData(C& c) noexcept  // NOLINT(runtime/references)
-    -> decltype(GetDataImpl(c, 0)) {
-  return GetDataImpl(c, 0);
-}
-
-// Detection idioms for size() and data().
-template <typename C>
-using HasSize =
-    std::is_integral<absl::decay_t<decltype(std::declval<C&>().size())>>;
-
-// We want to enable conversion from vector<T*> to Span<const T* const> but
-// disable conversion from vector<Derived> to Span<Base>. Here we use
-// the fact that U** is convertible to Q* const* if and only if Q is the same
-// type or a more cv-qualified version of U.  We also decay the result type of
-// data() to avoid problems with classes which have a member function data()
-// which returns a reference.
-template <typename T, typename C>
-using HasData =
-    std::is_convertible<absl::decay_t<decltype(GetData(std::declval<C&>()))>*,
-                        T* const*>;
-
-// Extracts value type from a Container
-template <typename C>
-struct ElementType {
-  using type = typename absl::remove_reference_t<C>::value_type;
-};
-
-template <typename T, size_t N>
-struct ElementType<T (&)[N]> {
-  using type = T;
-};
-
-template <typename C>
-using ElementT = typename ElementType<C>::type;
-
-template <typename T>
-using EnableIfMutable =
-    typename std::enable_if<!std::is_const<T>::value, int>::type;
-
-template <template <typename> class SpanT, typename T>
-bool EqualImpl(SpanT<T> a, SpanT<T> b) {
-  static_assert(std::is_const<T>::value, "");
-  return absl::equal(a.begin(), a.end(), b.begin(), b.end());
-}
-
-template <template <typename> class SpanT, typename T>
-bool LessThanImpl(SpanT<T> a, SpanT<T> b) {
-  // We can't use value_type since that is remove_cv_t<T>, so we go the long way
-  // around.
-  static_assert(std::is_const<T>::value, "");
-  return std::lexicographical_compare(a.begin(), a.end(), b.begin(), b.end());
-}
-
-// The `IsConvertible` classes here are needed because of the
-// `std::is_convertible` bug in libcxx when compiled with GCC. This build
-// configuration is used by Android NDK toolchain. Reference link:
-// https://bugs.llvm.org/show_bug.cgi?id=27538.
-template <typename From, typename To>
-struct IsConvertibleHelper {
- private:
-  static std::true_type testval(To);
-  static std::false_type testval(...);
-
- public:
-  using type = decltype(testval(std::declval<From>()));
-};
-
-template <typename From, typename To>
-struct IsConvertible : IsConvertibleHelper<From, To>::type {};
-
-// TODO(zhangxy): replace `IsConvertible` with `std::is_convertible` once the
-// older version of libcxx is not supported.
-template <typename From, typename To>
-using EnableIfConvertibleTo =
-    typename std::enable_if<IsConvertible<From, To>::value>::type;
-}  // namespace span_internal
-
 //------------------------------------------------------------------------------
 // Span
 //------------------------------------------------------------------------------
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