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Export of internal Abseil changes

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--
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
This commit is contained in:
Abseil Team 2019-08-05 11:32:04 -07:00 committed by vslashg
parent 14550beb3b
commit c5c4db4f51
12 changed files with 1145 additions and 26 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

1
absl/CMakeLists.txt
View file

@ -25,6 +25,7 @@ add_subdirectory(hash)
add_subdirectory(memory)
add_subdirectory(meta)
add_subdirectory(numeric)
add_subdirectory(random)
add_subdirectory(strings)
add_subdirectory(synchronization)
add_subdirectory(time)

3
absl/base/BUILD.bazel
View file

@ -155,6 +155,9 @@ cc_library(
visibility = [
"//absl:__subpackages__",
],
deps = [
"//absl/meta:type_traits",
],
)
cc_library(

2
absl/base/CMakeLists.txt
View file

@ -133,6 +133,8 @@ absl_cc_library(
"internal/invoke.h"
COPTS
${ABSL_DEFAULT_COPTS}
DEPS
absl::type_traits
)
absl_cc_library(

37
absl/base/internal/invoke.h
View file

@ -39,6 +39,8 @@
#include <type_traits>
#include <utility>
#include "absl/meta/type_traits.h"
// The following code is internal implementation detail. See the comment at the
// top of this file for the API documentation.
@ -67,15 +69,11 @@ struct MemFunAndRef : StrippedAccept<MemFunAndRef> {
template <typename... Args>
struct AcceptImpl : std::false_type {};
template <typename R, typename C, typename... Params, typename Obj,
typename... Args>
struct AcceptImpl<R (C::*)(Params...), Obj, Args...>
: std::is_base_of<C, Obj> {};
template <typename R, typename C, typename... Params, typename Obj,
typename... Args>
struct AcceptImpl<R (C::*)(Params...) const, Obj, Args...>
: std::is_base_of<C, Obj> {};
template <typename MemFunType, typename C, typename Obj, typename... Args>
struct AcceptImpl<MemFunType C::*, Obj, Args...>
: std::integral_constant<bool, std::is_base_of<C, Obj>::value &&
absl::is_function<MemFunType>::value> {
};
template <typename MemFun, typename Obj, typename... Args>
static decltype((std::declval<Obj>().*
@ -92,15 +90,11 @@ struct MemFunAndPtr : StrippedAccept<MemFunAndPtr> {
template <typename... Args>
struct AcceptImpl : std::false_type {};
template <typename R, typename C, typename... Params, typename Ptr,
typename... Args>
struct AcceptImpl<R (C::*)(Params...), Ptr, Args...>
: std::integral_constant<bool, !std::is_base_of<C, Ptr>::value> {};
template <typename R, typename C, typename... Params, typename Ptr,
typename... Args>
struct AcceptImpl<R (C::*)(Params...) const, Ptr, Args...>
: std::integral_constant<bool, !std::is_base_of<C, Ptr>::value> {};
template <typename MemFunType, typename C, typename Ptr, typename... Args>
struct AcceptImpl<MemFunType C::*, Ptr, Args...>
: std::integral_constant<bool, !std::is_base_of<C, Ptr>::value &&
absl::is_function<MemFunType>::value> {
};
template <typename MemFun, typename Ptr, typename... Args>
static decltype(((*std::declval<Ptr>()).*
@ -119,7 +113,9 @@ struct DataMemAndRef : StrippedAccept<DataMemAndRef> {
struct AcceptImpl : std::false_type {};
template <typename R, typename C, typename Obj>
struct AcceptImpl<R C::*, Obj> : std::is_base_of<C, Obj> {};
struct AcceptImpl<R C::*, Obj>
: std::integral_constant<bool, std::is_base_of<C, Obj>::value &&
!absl::is_function<R>::value> {};
template <typename DataMem, typename Ref>
static decltype(std::declval<Ref>().*std::declval<DataMem>()) Invoke(
@ -136,7 +132,8 @@ struct DataMemAndPtr : StrippedAccept<DataMemAndPtr> {
template <typename R, typename C, typename Ptr>
struct AcceptImpl<R C::*, Ptr>
: std::integral_constant<bool, !std::is_base_of<C, Ptr>::value> {};
: std::integral_constant<bool, !std::is_base_of<C, Ptr>::value &&
!absl::is_function<R>::value> {};
template <typename DataMem, typename Ptr>
static decltype((*std::declval<Ptr>()).*std::declval<DataMem>()) Invoke(

21
absl/base/invoke_test.cc
View file

@ -70,6 +70,10 @@ struct OverloadedFunctor {
struct Class {
int Method(int a, int b) { return a - b; }
int ConstMethod(int a, int b) const { return a - b; }
int RefMethod(int a, int b) & { return a - b; }
int RefRefMethod(int a, int b) && { return a - b; }
int NoExceptMethod(int a, int b) noexcept { return a - b; }
int VolatileMethod(int a, int b) volatile { return a - b; }
int member;
};
@ -151,8 +155,18 @@ TEST(InvokeTest, ReferenceWrapper) {
TEST(InvokeTest, MemberFunction) {
std::unique_ptr<Class> p(new Class);
std::unique_ptr<const Class> cp(new Class);
std::unique_ptr<volatile Class> vp(new Class);
EXPECT_EQ(1, Invoke(&Class::Method, p, 3, 2));
EXPECT_EQ(1, Invoke(&Class::Method, p.get(), 3, 2));
EXPECT_EQ(1, Invoke(&Class::Method, *p, 3, 2));
EXPECT_EQ(1, Invoke(&Class::RefMethod, p, 3, 2));
EXPECT_EQ(1, Invoke(&Class::RefMethod, p.get(), 3, 2));
EXPECT_EQ(1, Invoke(&Class::RefMethod, *p, 3, 2));
EXPECT_EQ(1, Invoke(&Class::RefRefMethod, std::move(*p), 3, 2)); // NOLINT
EXPECT_EQ(1, Invoke(&Class::NoExceptMethod, p, 3, 2));
EXPECT_EQ(1, Invoke(&Class::NoExceptMethod, p.get(), 3, 2));
EXPECT_EQ(1, Invoke(&Class::NoExceptMethod, *p, 3, 2));
EXPECT_EQ(1, Invoke(&Class::ConstMethod, p, 3, 2));
EXPECT_EQ(1, Invoke(&Class::ConstMethod, p.get(), 3, 2));
@ -162,6 +176,13 @@ TEST(InvokeTest, MemberFunction) {
EXPECT_EQ(1, Invoke(&Class::ConstMethod, cp.get(), 3, 2));
EXPECT_EQ(1, Invoke(&Class::ConstMethod, *cp, 3, 2));
EXPECT_EQ(1, Invoke(&Class::VolatileMethod, p, 3, 2));
EXPECT_EQ(1, Invoke(&Class::VolatileMethod, p.get(), 3, 2));
EXPECT_EQ(1, Invoke(&Class::VolatileMethod, *p, 3, 2));
EXPECT_EQ(1, Invoke(&Class::VolatileMethod, vp, 3, 2));
EXPECT_EQ(1, Invoke(&Class::VolatileMethod, vp.get(), 3, 2));
EXPECT_EQ(1, Invoke(&Class::VolatileMethod, *vp, 3, 2));
EXPECT_EQ(1, Invoke(&Class::Method, make_unique<Class>(), 3, 2));
EXPECT_EQ(1, Invoke(&Class::ConstMethod, make_unique<Class>(), 3, 2));
EXPECT_EQ(1, Invoke(&Class::ConstMethod, make_unique<const Class>(), 3, 2));

5
absl/copts/AbseilConfigureCopts.cmake
View file

@ -9,6 +9,7 @@ if("${CMAKE_CXX_COMPILER_ID}" STREQUAL "GNU")
set(ABSL_DEFAULT_COPTS "${ABSL_GCC_FLAGS}")
set(ABSL_TEST_COPTS "${ABSL_GCC_FLAGS};${ABSL_GCC_TEST_FLAGS}")
set(ABSL_EXCEPTIONS_FLAG "${ABSL_GCC_EXCEPTIONS_FLAGS}")
set(ABSL_RANDOM_RANDEN_COPTS "${ABSL_RANDOM_HWAES_X64_FLAGS}")
elseif("${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang")
# MATCHES so we get both Clang and AppleClang
if(MSVC)
@ -17,10 +18,12 @@ elseif("${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang")
set(ABSL_TEST_COPTS "${ABSL_CLANG_CL_FLAGS};${ABSL_CLANG_CL_TEST_FLAGS}")
set(ABSL_EXCEPTIONS_FLAG "${ABSL_CLANG_CL_EXCEPTIONS_FLAGS}")
set(ABSL_DEFAULT_LINKOPTS "${ABSL_MSVC_LINKOPTS}")
set(ABSL_RANDOM_RANDEN_COPTS "${ABSL_RANDOM_HWAES_MSVC_X64_FLAGS}")
else()
set(ABSL_DEFAULT_COPTS "${ABSL_LLVM_FLAGS}")
set(ABSL_TEST_COPTS "${ABSL_LLVM_FLAGS};${ABSL_LLVM_TEST_FLAGS}")
set(ABSL_EXCEPTIONS_FLAG "${ABSL_LLVM_EXCEPTIONS_FLAGS}")
set(ABSL_RANDOM_RANDEN_COPTS "${ABSL_RANDOM_HWAES_X64_FLAGS}")
if("${CMAKE_CXX_COMPILER_ID}" STREQUAL "Clang")
# AppleClang doesn't have lsan
# https://developer.apple.com/documentation/code_diagnostics
@ -35,11 +38,13 @@ elseif("${CMAKE_CXX_COMPILER_ID}" STREQUAL "MSVC")
set(ABSL_TEST_COPTS "${ABSL_MSVC_FLAGS};${ABSL_MSVC_TEST_FLAGS}")
set(ABSL_EXCEPTIONS_FLAG "${ABSL_MSVC_EXCEPTIONS_FLAGS}")
set(ABSL_DEFAULT_LINKOPTS "${ABSL_MSVC_LINKOPTS}")
set(ABSL_RANDOM_RANDEN_COPTS "${ABSL_RANDOM_HWAES_MSVC_X64_FLAGS}")
else()
message(WARNING "Unknown compiler: ${CMAKE_CXX_COMPILER}. Building with no default flags")
set(ABSL_DEFAULT_COPTS "")
set(ABSL_TEST_COPTS "")
set(ABSL_EXCEPTIONS_FLAG "")
set(ABSL_RANDOM_RANDEN_COPTS "")
endif()
# This flag is used internally for Bazel builds and is kept here for consistency

17
absl/meta/type_traits.h
View file

@ -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.

16
absl/meta/type_traits_test.cc
View file

@ -385,6 +385,22 @@ class Base {
#define ABSL_GCC_BUG_TRIVIALLY_CONSTRUCTIBLE_ON_ARRAY_OF_NONTRIVIAL 1
#endif
TEST(TypeTraitsTest, TestIsFunction) {
struct Callable {
void operator()() {}
};
EXPECT_TRUE(absl::is_function<void()>::value);
EXPECT_TRUE(absl::is_function<void()&>::value);
EXPECT_TRUE(absl::is_function<void() const>::value);
EXPECT_TRUE(absl::is_function<void() noexcept>::value);
EXPECT_TRUE(absl::is_function<void(...) noexcept>::value);
EXPECT_FALSE(absl::is_function<void(*)()>::value);
EXPECT_FALSE(absl::is_function<void(&)()>::value);
EXPECT_FALSE(absl::is_function<int>::value);
EXPECT_FALSE(absl::is_function<Callable>::value);
}
TEST(TypeTraitsTest, TestTrivialDestructor) {
// Verify that arithmetic types and pointers have trivial destructors.
EXPECT_TRUE(absl::is_trivially_destructible<bool>::value);

1034
absl/random/CMakeLists.txt Normal file
View file

File diff suppressed because it is too large Load diff

8
absl/random/internal/salted_seed_seq.h
View file

@ -56,11 +56,11 @@ class SaltedSeedSeq {
SaltedSeedSeq(std::initializer_list<T> il)
: SaltedSeedSeq(il.begin(), il.end()) {}
SaltedSeedSeq(const SaltedSeedSeq& other) = delete;
SaltedSeedSeq& operator=(const SaltedSeedSeq& other) = delete;
SaltedSeedSeq(const SaltedSeedSeq&) = delete;
SaltedSeedSeq& operator=(const SaltedSeedSeq&) = delete;
SaltedSeedSeq(SaltedSeedSeq&& other) = default;
SaltedSeedSeq& operator=(SaltedSeedSeq&& other) = default;
SaltedSeedSeq(SaltedSeedSeq&&) = default;
SaltedSeedSeq& operator=(SaltedSeedSeq&&) = default;
template <typename RandomAccessIterator>
void generate(RandomAccessIterator begin, RandomAccessIterator end) {

23
absl/strings/str_split_benchmark.cc
View file

@ -44,6 +44,29 @@ void BM_Split2StringView(benchmark::State& state) {
}
BENCHMARK_RANGE(BM_Split2StringView, 0, 1 << 20);
static const absl::string_view kDelimiters = ";:,.";
std::string MakeMultiDelimiterTestString(int desired_length) {
static const int kAverageValueLen = 25;
std::string test(desired_length * kAverageValueLen, 'x');
for (int i = 0; i * kAverageValueLen < test.size(); ++i) {
// Cycle through a variety of delimiters.
test[i * kAverageValueLen] = kDelimiters[i % kDelimiters.size()];
}
return test;
}
// Measure StrSplit with ByAnyChar with four delimiters to choose from.
void BM_Split2StringViewByAnyChar(benchmark::State& state) {
std::string test = MakeMultiDelimiterTestString(state.range(0));
for (auto _ : state) {
std::vector<absl::string_view> result =
absl::StrSplit(test, absl::ByAnyChar(kDelimiters));
benchmark::DoNotOptimize(result);
}
}
BENCHMARK_RANGE(BM_Split2StringViewByAnyChar, 0, 1 << 20);
void BM_Split2StringViewLifted(benchmark::State& state) {
std::string test = MakeTestString(state.range(0));
std::vector<absl::string_view> result;

4
absl/types/optional.h
View file

@ -499,7 +499,7 @@ class optional : private optional_internal::optional_data<T>,
template <typename U>
constexpr T value_or(U&& v) const& {
static_assert(std::is_copy_constructible<value_type>::value,
"optional<T>::value_or: T must by copy constructible");
"optional<T>::value_or: T must be copy constructible");
static_assert(std::is_convertible<U&&, value_type>::value,
"optional<T>::value_or: U must be convertible to T");
return static_cast<bool>(*this)
@ -509,7 +509,7 @@ class optional : private optional_internal::optional_data<T>,
template <typename U>
T value_or(U&& v) && { // NOLINT(build/c++11)
static_assert(std::is_move_constructible<value_type>::value,
"optional<T>::value_or: T must by move constructible");
"optional<T>::value_or: T must be move constructible");
static_assert(std::is_convertible<U&&, value_type>::value,
"optional<T>::value_or: U must be convertible to T");
return static_cast<bool>(*this) ? std::move(**this)