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Export of internal Abseil changes.

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e7f892a0b9b313b434c5f9e9a2365b377204b60e by Abseil Team <absl-team@google.com>:

Remove internal CaseEqual helper now that we have the equivalent absl::EqualsIgnoreCase.

PiperOrigin-RevId: 225189084

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722af2c74766d2fe3cee13c8dc886d39aedda597 by Abseil Team <absl-team@google.com>:

Add -Wno-extra-semi-stmt to silence that warning.

The [-Wno-extra-semi] is already disabled in the build.  This
change will allow the build to remain consistent across newer
versions of clang which are now issuing a new similiar warning
[-Wextra-semi-stmt]:

  https://clang.llvm.org/docs/ReleaseNotes.html#major-new-features
  https://clang.llvm.org/docs/DiagnosticsReference.html#wextra-semi-stmt

PiperOrigin-RevId: 225185101

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f7fd6244b4efcf0331631a54b7b0cf5f1f691a89 by CJ Johnson <johnsoncj@google.com>:

Move using directive in swap implementation

PiperOrigin-RevId: 225017825

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3005841725df5b9cdb35c8a5319bb4c78b5dc2b7 by Abseil Team <absl-team@google.com>:

Update absl/strings/CMakeLists.txt to use new functions
i.e. absl_cc_(library|test)

PiperOrigin-RevId: 224860689

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eeaf7099924b182472bfea3636ef6d9a39adfc50 by CJ Johnson <johnsoncj@google.com>:

Prefer public method over private for InlinedVector allocator access

PiperOrigin-RevId: 224825775

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db9d218e3ca7ab400eef97778b720cb082a03281 by Eric Fiselier <ericwf@google.com>:

Take advantage of secret libc++ resize uninitialized function in string.

PiperOrigin-RevId: 224817877
GitOrigin-RevId: e7f892a0b9b313b434c5f9e9a2365b377204b60e
Change-Id: I051beee37ee03f0570bd2e068355ad75c8bdfcf8
This commit is contained in:
Abseil Team 2018-12-12 08:20:32 -08:00 • committed by jueminyang
parent 455dc17ba1
commit 8fbcdb9095
6 changed files with 490 additions and 458 deletions
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35
absl/strings/internal/resize_uninitialized.h
View file

@ -18,6 +18,7 @@
#define ABSL_STRINGS_INTERNAL_RESIZE_UNINITIALIZED_H_
#include <string>
#include <type_traits>
#include <utility>
#include "absl/base/port.h"
@ -27,22 +28,24 @@ namespace absl {
namespace strings_internal {
// Is a subclass of true_type or false_type, depending on whether or not
// T has a resize_uninitialized member.
template <typename T, typename = void>
struct HasResizeUninitialized : std::false_type {};
template <typename T>
struct HasResizeUninitialized<
T, absl::void_t<decltype(std::declval<T>().resize_uninitialized(237))>>
: std::true_type {};
// T has a __resize_default_init member.
template <typename string_type, typename = void>
struct ResizeUninitializedTraits {
using HasMember = std::false_type;
static void Resize(string_type* s, size_t new_size) { s->resize(new_size); }
};
// __resize_default_init is provided by libc++ >= 8.0 and by Google's internal
// ::string implementation.
template <typename string_type>
void ResizeUninit(string_type* s, size_t new_size, std::true_type) {
s->resize_uninitialized(new_size);
}
template <typename string_type>
void ResizeUninit(string_type* s, size_t new_size, std::false_type) {
s->resize(new_size);
}
struct ResizeUninitializedTraits<
string_type, absl::void_t<decltype(std::declval<string_type&>()
.__resize_default_init(237))> > {
using HasMember = std::true_type;
static void Resize(string_type* s, size_t new_size) {
s->__resize_default_init(new_size);
}
};
// Returns true if the string implementation supports a resize where
// the new characters added to the string are left untouched.
@ -51,7 +54,7 @@ void ResizeUninit(string_type* s, size_t new_size, std::false_type) {
// the previous function.)
template <typename string_type>
inline constexpr bool STLStringSupportsNontrashingResize(string_type*) {
return HasResizeUninitialized<string_type>();
return ResizeUninitializedTraits<string_type>::HasMember::value;
}
// Like str->resize(new_size), except any new characters added to "*str" as a
@ -60,7 +63,7 @@ inline constexpr bool STLStringSupportsNontrashingResize(string_type*) {
// store of the string with known data. Uses a Google extension to ::string.
template <typename string_type, typename = void>
inline void STLStringResizeUninitialized(string_type* s, size_t new_size) {
ResizeUninit(s, new_size, HasResizeUninitialized<string_type>());
ResizeUninitializedTraits<string_type>::Resize(s, new_size);
}
} // namespace strings_internal