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Vincent Ambo 2020-05-20 02:32:24 +01:00
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93
third_party/abseil_cpp/absl/functional/BUILD.bazel vendored Normal file
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#
# 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"]) # Apache 2.0
cc_library(
name = "bind_front",
srcs = ["internal/front_binder.h"],
hdrs = ["bind_front.h"],
copts = ABSL_DEFAULT_COPTS,
linkopts = ABSL_DEFAULT_LINKOPTS,
deps = [
"//absl/base:base_internal",
"//absl/container:compressed_tuple",
"//absl/meta:type_traits",
"//absl/utility",
],
)
cc_test(
name = "bind_front_test",
srcs = ["bind_front_test.cc"],
copts = ABSL_TEST_COPTS,
linkopts = ABSL_DEFAULT_LINKOPTS,
deps = [
":bind_front",
"//absl/memory",
"@com_google_googletest//:gtest_main",
],
)
cc_library(
name = "function_ref",
srcs = ["internal/function_ref.h"],
hdrs = ["function_ref.h"],
copts = ABSL_DEFAULT_COPTS,
linkopts = ABSL_DEFAULT_LINKOPTS,
deps = [
"//absl/base:base_internal",
"//absl/meta:type_traits",
],
)
cc_test(
name = "function_ref_test",
size = "small",
srcs = ["function_ref_test.cc"],
copts = ABSL_TEST_COPTS,
deps = [
":function_ref",
"//absl/container:test_instance_tracker",
"//absl/memory",
"@com_google_googletest//:gtest_main",
],
)
cc_test(
name = "function_ref_benchmark",
srcs = [
"function_ref_benchmark.cc",
],
copts = ABSL_TEST_COPTS,
tags = ["benchmark"],
visibility = ["//visibility:private"],
deps = [
":function_ref",
"//absl/base:core_headers",
"@com_github_google_benchmark//:benchmark_main",
],
)

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#
# 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.
#
absl_cc_library(
NAME
bind_front
SRCS
"internal/front_binder.h"
HDRS
"bind_front.h"
COPTS
${ABSL_DEFAULT_COPTS}
DEPS
absl::base_internal
absl::compressed_tuple
PUBLIC
)
absl_cc_test(
NAME
bind_front_test
SRCS
"bind_front_test.cc"
COPTS
${ABSL_DEFAULT_COPTS}
DEPS
absl::bind_front
absl::memory
gmock_main
)
absl_cc_library(
NAME
function_ref
SRCS
"internal/function_ref.h"
HDRS
"function_ref.h"
COPTS
${ABSL_DEFAULT_COPTS}
DEPS
absl::base_internal
absl::meta
PUBLIC
)
absl_cc_test(
NAME
function_ref_test
SRCS
"function_ref_test.cc"
COPTS
${ABSL_TEST_COPTS}
DEPS
absl::function_ref
absl::memory
absl::test_instance_tracker
gmock_main
)

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third_party/abseil_cpp/absl/functional/bind_front.h vendored Normal file
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// 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.
//
// -----------------------------------------------------------------------------
// File: bind_front.h
// -----------------------------------------------------------------------------
//
// `absl::bind_front()` returns a functor by binding a number of arguments to
// the front of a provided (usually more generic) functor. Unlike `std::bind`,
// it does not require the use of argument placeholders. The simpler syntax of
// `absl::bind_front()` allows you to avoid known misuses with `std::bind()`.
//
// `absl::bind_front()` is meant as a drop-in replacement for C++20's upcoming
// `std::bind_front()`, which similarly resolves these issues with
// `std::bind()`. Both `bind_front()` alternatives, unlike `std::bind()`, allow
// partial function application. (See
// https://en.wikipedia.org/wiki/Partial_application).
#ifndef ABSL_FUNCTIONAL_BIND_FRONT_H_
#define ABSL_FUNCTIONAL_BIND_FRONT_H_
#include "absl/functional/internal/front_binder.h"
#include "absl/utility/utility.h"
namespace absl {
ABSL_NAMESPACE_BEGIN
// bind_front()
//
// Binds the first N arguments of an invocable object and stores them by value.
//
// Like `std::bind()`, `absl::bind_front()` is implicitly convertible to
// `std::function`. In particular, it may be used as a simpler replacement for
// `std::bind()` in most cases, as it does not require placeholders to be
// specified. More importantly, it provides more reliable correctness guarantees
// than `std::bind()`; while `std::bind()` will silently ignore passing more
// parameters than expected, for example, `absl::bind_front()` will report such
// mis-uses as errors.
//
// absl::bind_front(a...) can be seen as storing the results of
// std::make_tuple(a...).
//
// Example: Binding a free function.
//
// int Minus(int a, int b) { return a - b; }
//
// assert(absl::bind_front(Minus)(3, 2) == 3 - 2);
// assert(absl::bind_front(Minus, 3)(2) == 3 - 2);
// assert(absl::bind_front(Minus, 3, 2)() == 3 - 2);
//
// Example: Binding a member function.
//
// struct Math {
// int Double(int a) const { return 2 * a; }
// };
//
// Math math;
//
// assert(absl::bind_front(&Math::Double)(&math, 3) == 2 * 3);
// // Stores a pointer to math inside the functor.
// assert(absl::bind_front(&Math::Double, &math)(3) == 2 * 3);
// // Stores a copy of math inside the functor.
// assert(absl::bind_front(&Math::Double, math)(3) == 2 * 3);
// // Stores std::unique_ptr<Math> inside the functor.
// assert(absl::bind_front(&Math::Double,
// std::unique_ptr<Math>(new Math))(3) == 2 * 3);
//
// Example: Using `absl::bind_front()`, instead of `std::bind()`, with
// `std::function`.
//
// class FileReader {
// public:
// void ReadFileAsync(const std::string& filename, std::string* content,
// const std::function<void()>& done) {
// // Calls Executor::Schedule(std::function<void()>).
// Executor::DefaultExecutor()->Schedule(
// absl::bind_front(&FileReader::BlockingRead, this,
// filename, content, done));
// }
//
// private:
// void BlockingRead(const std::string& filename, std::string* content,
// const std::function<void()>& done) {
// CHECK_OK(file::GetContents(filename, content, {}));
// done();
// }
// };
//
// `absl::bind_front()` stores bound arguments explicitly using the type passed
// rather than implicitly based on the type accepted by its functor.
//
// Example: Binding arguments explicitly.
//
// void LogStringView(absl::string_view sv) {
// LOG(INFO) << sv;
// }
//
// Executor* e = Executor::DefaultExecutor();
// std::string s = "hello";
// absl::string_view sv = s;
//
// // absl::bind_front(LogStringView, arg) makes a copy of arg and stores it.
// e->Schedule(absl::bind_front(LogStringView, sv)); // ERROR: dangling
// // string_view.
//
// e->Schedule(absl::bind_front(LogStringView, s)); // OK: stores a copy of
// // s.
//
// To store some of the arguments passed to `absl::bind_front()` by reference,
// use std::ref()` and `std::cref()`.
//
// Example: Storing some of the bound arguments by reference.
//
// class Service {
// public:
// void Serve(const Request& req, std::function<void()>* done) {
// // The request protocol buffer won't be deleted until done is called.
// // It's safe to store a reference to it inside the functor.
// Executor::DefaultExecutor()->Schedule(
// absl::bind_front(&Service::BlockingServe, this, std::cref(req),
// done));
// }
//
// private:
// void BlockingServe(const Request& req, std::function<void()>* done);
// };
//
// Example: Storing bound arguments by reference.
//
// void Print(const std::string& a, const std::string& b) {
// std::cerr << a << b;
// }
//
// std::string hi = "Hello, ";
// std::vector<std::string> names = {"Chuk", "Gek"};
// // Doesn't copy hi.
// for_each(names.begin(), names.end(),
// absl::bind_front(Print, std::ref(hi)));
//
// // DO NOT DO THIS: the functor may outlive "hi", resulting in
// // dangling references.
// foo->DoInFuture(absl::bind_front(Print, std::ref(hi), "Guest")); // BAD!
// auto f = absl::bind_front(Print, std::ref(hi), "Guest"); // BAD!
//
// Example: Storing reference-like types.
//
// void Print(absl::string_view a, const std::string& b) {
// std::cerr << a << b;
// }
//
// std::string hi = "Hello, ";
// // Copies "hi".
// absl::bind_front(Print, hi)("Chuk");
//
// // Compile error: std::reference_wrapper<const string> is not implicitly
// // convertible to string_view.
// // absl::bind_front(Print, std::cref(hi))("Chuk");
//
// // Doesn't copy "hi".
// absl::bind_front(Print, absl::string_view(hi))("Chuk");
//
template <class F, class... BoundArgs>
constexpr functional_internal::bind_front_t<F, BoundArgs...> bind_front(
F&& func, BoundArgs&&... args) {
return functional_internal::bind_front_t<F, BoundArgs...>(
absl::in_place, absl::forward<F>(func),
absl::forward<BoundArgs>(args)...);
}
ABSL_NAMESPACE_END
} // namespace absl
#endif // ABSL_FUNCTIONAL_BIND_FRONT_H_

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// 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/functional/bind_front.h"
#include <stddef.h>
#include <functional>
#include <memory>
#include <string>
#include "gmock/gmock.h"
#include "gtest/gtest.h"
#include "absl/memory/memory.h"
namespace {
char CharAt(const char* s, size_t index) { return s[index]; }
TEST(BindTest, Basics) {
EXPECT_EQ('C', absl::bind_front(CharAt)("ABC", 2));
EXPECT_EQ('C', absl::bind_front(CharAt, "ABC")(2));
EXPECT_EQ('C', absl::bind_front(CharAt, "ABC", 2)());
}
TEST(BindTest, Lambda) {
auto lambda = [](int x, int y, int z) { return x + y + z; };
EXPECT_EQ(6, absl::bind_front(lambda)(1, 2, 3));
EXPECT_EQ(6, absl::bind_front(lambda, 1)(2, 3));
EXPECT_EQ(6, absl::bind_front(lambda, 1, 2)(3));
EXPECT_EQ(6, absl::bind_front(lambda, 1, 2, 3)());
}
struct Functor {
std::string operator()() & { return "&"; }
std::string operator()() const& { return "const&"; }
std::string operator()() && { return "&&"; }
std::string operator()() const&& { return "const&&"; }
};
TEST(BindTest, PerfectForwardingOfBoundArgs) {
auto f = absl::bind_front(Functor());
const auto& cf = f;
EXPECT_EQ("&", f());
EXPECT_EQ("const&", cf());
EXPECT_EQ("&&", std::move(f)());
EXPECT_EQ("const&&", std::move(cf)());
}
struct ArgDescribe {
std::string operator()(int&) const { return "&"; } // NOLINT
std::string operator()(const int&) const { return "const&"; } // NOLINT
std::string operator()(int&&) const { return "&&"; }
std::string operator()(const int&&) const { return "const&&"; }
};
TEST(BindTest, PerfectForwardingOfFreeArgs) {
ArgDescribe f;
int i;
EXPECT_EQ("&", absl::bind_front(f)(static_cast<int&>(i)));
EXPECT_EQ("const&", absl::bind_front(f)(static_cast<const int&>(i)));
EXPECT_EQ("&&", absl::bind_front(f)(static_cast<int&&>(i)));
EXPECT_EQ("const&&", absl::bind_front(f)(static_cast<const int&&>(i)));
}
struct NonCopyableFunctor {
NonCopyableFunctor() = default;
NonCopyableFunctor(const NonCopyableFunctor&) = delete;
NonCopyableFunctor& operator=(const NonCopyableFunctor&) = delete;
const NonCopyableFunctor* operator()() const { return this; }
};
TEST(BindTest, RefToFunctor) {
// It won't copy/move the functor and use the original object.
NonCopyableFunctor ncf;
auto bound_ncf = absl::bind_front(std::ref(ncf));
auto bound_ncf_copy = bound_ncf;
EXPECT_EQ(&ncf, bound_ncf_copy());
}
struct Struct {
std::string value;
};
TEST(BindTest, StoreByCopy) {
Struct s = {"hello"};
auto f = absl::bind_front(&Struct::value, s);
auto g = f;
EXPECT_EQ("hello", f());
EXPECT_EQ("hello", g());
EXPECT_NE(&s.value, &f());
EXPECT_NE(&s.value, &g());
EXPECT_NE(&g(), &f());
}
struct NonCopyable {
explicit NonCopyable(const std::string& s) : value(s) {}
NonCopyable(const NonCopyable&) = delete;
NonCopyable& operator=(const NonCopyable&) = delete;
std::string value;
};
const std::string& GetNonCopyableValue(const NonCopyable& n) { return n.value; }
TEST(BindTest, StoreByRef) {
NonCopyable s("hello");
auto f = absl::bind_front(&GetNonCopyableValue, std::ref(s));
EXPECT_EQ("hello", f());
EXPECT_EQ(&s.value, &f());
auto g = std::move(f); // NOLINT
EXPECT_EQ("hello", g());
EXPECT_EQ(&s.value, &g());
s.value = "goodbye";
EXPECT_EQ("goodbye", g());
}
TEST(BindTest, StoreByCRef) {
NonCopyable s("hello");
auto f = absl::bind_front(&GetNonCopyableValue, std::cref(s));
EXPECT_EQ("hello", f());
EXPECT_EQ(&s.value, &f());
auto g = std::move(f); // NOLINT
EXPECT_EQ("hello", g());
EXPECT_EQ(&s.value, &g());
s.value = "goodbye";
EXPECT_EQ("goodbye", g());
}
const std::string& GetNonCopyableValueByWrapper(
std::reference_wrapper<NonCopyable> n) {
return n.get().value;
}
TEST(BindTest, StoreByRefInvokeByWrapper) {
NonCopyable s("hello");
auto f = absl::bind_front(GetNonCopyableValueByWrapper, std::ref(s));
EXPECT_EQ("hello", f());
EXPECT_EQ(&s.value, &f());
auto g = std::move(f);
EXPECT_EQ("hello", g());
EXPECT_EQ(&s.value, &g());
s.value = "goodbye";
EXPECT_EQ("goodbye", g());
}
TEST(BindTest, StoreByPointer) {
NonCopyable s("hello");
auto f = absl::bind_front(&NonCopyable::value, &s);
EXPECT_EQ("hello", f());
EXPECT_EQ(&s.value, &f());
auto g = std::move(f);
EXPECT_EQ("hello", g());
EXPECT_EQ(&s.value, &g());
}
int Sink(std::unique_ptr<int> p) {
return *p;
}
std::unique_ptr<int> Factory(int n) { return absl::make_unique<int>(n); }
TEST(BindTest, NonCopyableArg) {
EXPECT_EQ(42, absl::bind_front(Sink)(absl::make_unique<int>(42)));
EXPECT_EQ(42, absl::bind_front(Sink, absl::make_unique<int>(42))());
}
TEST(BindTest, NonCopyableResult) {
EXPECT_THAT(absl::bind_front(Factory)(42), ::testing::Pointee(42));
EXPECT_THAT(absl::bind_front(Factory, 42)(), ::testing::Pointee(42));
}
// is_copy_constructible<FalseCopyable<unique_ptr<T>> is true but an attempt to
// instantiate the copy constructor leads to a compile error. This is similar
// to how standard containers behave.
template <class T>
struct FalseCopyable {
FalseCopyable() {}
FalseCopyable(const FalseCopyable& other) : m(other.m) {}
FalseCopyable(FalseCopyable&& other) : m(std::move(other.m)) {}
T m;
};
int GetMember(FalseCopyable<std::unique_ptr<int>> x) { return *x.m; }
TEST(BindTest, WrappedMoveOnly) {
FalseCopyable<std::unique_ptr<int>> x;
x.m = absl::make_unique<int>(42);
auto f = absl::bind_front(&GetMember, std::move(x));
EXPECT_EQ(42, std::move(f)());
}
int Plus(int a, int b) { return a + b; }
TEST(BindTest, ConstExpr) {
constexpr auto f = absl::bind_front(CharAt);
EXPECT_EQ(f("ABC", 1), 'B');
static constexpr int five = 5;
constexpr auto plus5 = absl::bind_front(Plus, five);
EXPECT_EQ(plus5(1), 6);
// There seems to be a bug in MSVC dealing constexpr construction of
// char[]. Notice 'plus5' above; 'int' works just fine.
#if !(defined(_MSC_VER) && _MSC_VER < 1910)
static constexpr char data[] = "DEF";
constexpr auto g = absl::bind_front(CharAt, data);
EXPECT_EQ(g(1), 'E');
#endif
}
struct ManglingCall {
int operator()(int, double, std::string) const { return 0; }
};
TEST(BindTest, Mangling) {
// We just want to generate a particular instantiation to see its mangling.
absl::bind_front(ManglingCall{}, 1, 3.3)("A");
}
} // namespace

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// 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.
//
// -----------------------------------------------------------------------------
// File: function_ref.h
// -----------------------------------------------------------------------------
//
// This header file defines the `absl::FunctionRef` type for holding a
// non-owning reference to an object of any invocable type. This function
// reference is typically most useful as a type-erased argument type for
// accepting function types that neither take ownership nor copy the type; using
// the reference type in this case avoids a copy and an allocation. Best
// practices of other non-owning reference-like objects (such as
// `absl::string_view`) apply here.
//
// An `absl::FunctionRef` is similar in usage to a `std::function` but has the
// following differences:
//
// * It doesn't own the underlying object.
// * It doesn't have a null or empty state.
// * It never performs deep copies or allocations.
// * It's much faster and cheaper to construct.
// * It's trivially copyable and destructable.
//
// Generally, `absl::FunctionRef` should not be used as a return value, data
// member, or to initialize a `std::function`. Such usages will often lead to
// problematic lifetime issues. Once you convert something to an
// `absl::FunctionRef` you cannot make a deep copy later.
//
// This class is suitable for use wherever a "const std::function<>&"
// would be used without making a copy. ForEach functions and other versions of
// the visitor pattern are a good example of when this class should be used.
//
// This class is trivial to copy and should be passed by value.
#ifndef ABSL_FUNCTIONAL_FUNCTION_REF_H_
#define ABSL_FUNCTIONAL_FUNCTION_REF_H_
#include <cassert>
#include <functional>
#include <type_traits>
#include "absl/functional/internal/function_ref.h"
#include "absl/meta/type_traits.h"
namespace absl {
ABSL_NAMESPACE_BEGIN
// FunctionRef
//
// Dummy class declaration to allow the partial specialization based on function
// types below.
template <typename T>
class FunctionRef;
// FunctionRef
//
// An `absl::FunctionRef` is a lightweight wrapper to any invokable object with
// a compatible signature. Generally, an `absl::FunctionRef` should only be used
// as an argument type and should be preferred as an argument over a const
// reference to a `std::function`.
//
// Example:
//
// // The following function takes a function callback by const reference
// bool Visitor(const std::function<void(my_proto&,
// absl::string_view)>& callback);
//
// // Assuming that the function is not stored or otherwise copied, it can be
// // replaced by an `absl::FunctionRef`:
// bool Visitor(absl::FunctionRef<void(my_proto&, absl::string_view)>
// callback);
//
// Note: the assignment operator within an `absl::FunctionRef` is intentionally
// deleted to prevent misuse; because the `absl::FunctionRef` does not own the
// underlying type, assignment likely indicates misuse.
template <typename R, typename... Args>
class FunctionRef<R(Args...)> {
private:
// Used to disable constructors for objects that are not compatible with the
// signature of this FunctionRef.
template <typename F,
typename FR = absl::base_internal::InvokeT<F, Args&&...>>
using EnableIfCompatible =
typename std::enable_if<std::is_void<R>::value ||
std::is_convertible<FR, R>::value>::type;
public:
// Constructs a FunctionRef from any invokable type.
template <typename F, typename = EnableIfCompatible<const F&>>
FunctionRef(const F& f) // NOLINT(runtime/explicit)
: invoker_(&absl::functional_internal::InvokeObject<F, R, Args...>) {
absl::functional_internal::AssertNonNull(f);
ptr_.obj = &f;
}
// Overload for function pointers. This eliminates a level of indirection that
// would happen if the above overload was used (it lets us store the pointer
// instead of a pointer to a pointer).
//
// This overload is also used for references to functions, since references to
// functions can decay to function pointers implicitly.
template <
typename F, typename = EnableIfCompatible<F*>,
absl::functional_internal::EnableIf<absl::is_function<F>::value> = 0>
FunctionRef(F* f) // NOLINT(runtime/explicit)
: invoker_(&absl::functional_internal::InvokeFunction<F*, R, Args...>) {
assert(f != nullptr);
ptr_.fun = reinterpret_cast<decltype(ptr_.fun)>(f);
}
// To help prevent subtle lifetime bugs, FunctionRef is not assignable.
// Typically, it should only be used as an argument type.
FunctionRef& operator=(const FunctionRef& rhs) = delete;
// Call the underlying object.
R operator()(Args... args) const {
return invoker_(ptr_, std::forward<Args>(args)...);
}
private:
absl::functional_internal::VoidPtr ptr_;
absl::functional_internal::Invoker<R, Args...> invoker_;
};
ABSL_NAMESPACE_END
} // namespace absl
#endif // ABSL_FUNCTIONAL_FUNCTION_REF_H_

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// 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.
#include "absl/functional/function_ref.h"
#include <memory>
#include "benchmark/benchmark.h"
#include "absl/base/attributes.h"
namespace absl {
ABSL_NAMESPACE_BEGIN
namespace {
int dummy = 0;
void FreeFunction() { benchmark::DoNotOptimize(dummy); }
struct TrivialFunctor {
void operator()() const { benchmark::DoNotOptimize(dummy); }
};
struct LargeFunctor {
void operator()() const { benchmark::DoNotOptimize(this); }
std::string a, b, c;
};
template <typename Function, typename... Args>
void ABSL_ATTRIBUTE_NOINLINE CallFunction(Function f, Args&&... args) {
f(std::forward<Args>(args)...);
}
template <typename Function, typename Callable, typename... Args>
void ConstructAndCallFunctionBenchmark(benchmark::State& state,
const Callable& c, Args&&... args) {
for (auto _ : state) {
CallFunction<Function>(c, std::forward<Args>(args)...);
}
}
void BM_TrivialStdFunction(benchmark::State& state) {
ConstructAndCallFunctionBenchmark<std::function<void()>>(state,
TrivialFunctor{});
}
BENCHMARK(BM_TrivialStdFunction);
void BM_TrivialFunctionRef(benchmark::State& state) {
ConstructAndCallFunctionBenchmark<FunctionRef<void()>>(state,
TrivialFunctor{});
}
BENCHMARK(BM_TrivialFunctionRef);
void BM_LargeStdFunction(benchmark::State& state) {
ConstructAndCallFunctionBenchmark<std::function<void()>>(state,
LargeFunctor{});
}
BENCHMARK(BM_LargeStdFunction);
void BM_LargeFunctionRef(benchmark::State& state) {
ConstructAndCallFunctionBenchmark<FunctionRef<void()>>(state, LargeFunctor{});
}
BENCHMARK(BM_LargeFunctionRef);
void BM_FunPtrStdFunction(benchmark::State& state) {
ConstructAndCallFunctionBenchmark<std::function<void()>>(state, FreeFunction);
}
BENCHMARK(BM_FunPtrStdFunction);
void BM_FunPtrFunctionRef(benchmark::State& state) {
ConstructAndCallFunctionBenchmark<FunctionRef<void()>>(state, FreeFunction);
}
BENCHMARK(BM_FunPtrFunctionRef);
// Doesn't include construction or copy overhead in the loop.
template <typename Function, typename Callable, typename... Args>
void CallFunctionBenchmark(benchmark::State& state, const Callable& c,
Args... args) {
Function f = c;
for (auto _ : state) {
benchmark::DoNotOptimize(&f);
f(args...);
}
}
struct FunctorWithTrivialArgs {
void operator()(int a, int b, int c) const {
benchmark::DoNotOptimize(a);
benchmark::DoNotOptimize(b);
benchmark::DoNotOptimize(c);
}
};
void BM_TrivialArgsStdFunction(benchmark::State& state) {
CallFunctionBenchmark<std::function<void(int, int, int)>>(
state, FunctorWithTrivialArgs{}, 1, 2, 3);
}
BENCHMARK(BM_TrivialArgsStdFunction);
void BM_TrivialArgsFunctionRef(benchmark::State& state) {
CallFunctionBenchmark<FunctionRef<void(int, int, int)>>(
state, FunctorWithTrivialArgs{}, 1, 2, 3);
}
BENCHMARK(BM_TrivialArgsFunctionRef);
struct FunctorWithNonTrivialArgs {
void operator()(std::string a, std::string b, std::string c) const {
benchmark::DoNotOptimize(&a);
benchmark::DoNotOptimize(&b);
benchmark::DoNotOptimize(&c);
}
};
void BM_NonTrivialArgsStdFunction(benchmark::State& state) {
std::string a, b, c;
CallFunctionBenchmark<
std::function<void(std::string, std::string, std::string)>>(
state, FunctorWithNonTrivialArgs{}, a, b, c);
}
BENCHMARK(BM_NonTrivialArgsStdFunction);
void BM_NonTrivialArgsFunctionRef(benchmark::State& state) {
std::string a, b, c;
CallFunctionBenchmark<
FunctionRef<void(std::string, std::string, std::string)>>(
state, FunctorWithNonTrivialArgs{}, a, b, c);
}
BENCHMARK(BM_NonTrivialArgsFunctionRef);
} // namespace
ABSL_NAMESPACE_END
} // namespace absl

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// 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.
#include "absl/functional/function_ref.h"
#include <memory>
#include "gmock/gmock.h"
#include "gtest/gtest.h"
#include "absl/container/internal/test_instance_tracker.h"
#include "absl/memory/memory.h"
namespace absl {
ABSL_NAMESPACE_BEGIN
namespace {
void RunFun(FunctionRef<void()> f) { f(); }
TEST(FunctionRefTest, Lambda) {
bool ran = false;
RunFun([&] { ran = true; });
EXPECT_TRUE(ran);
}
int Function() { return 1337; }
TEST(FunctionRefTest, Function1) {
FunctionRef<int()> ref(&Function);
EXPECT_EQ(1337, ref());
}
TEST(FunctionRefTest, Function2) {
FunctionRef<int()> ref(Function);
EXPECT_EQ(1337, ref());
}
int NoExceptFunction() noexcept { return 1337; }
// TODO(jdennett): Add a test for noexcept member functions.
TEST(FunctionRefTest, NoExceptFunction) {
FunctionRef<int()> ref(NoExceptFunction);
EXPECT_EQ(1337, ref());
}
TEST(FunctionRefTest, ForwardsArgs) {
auto l = [](std::unique_ptr<int> i) { return *i; };
FunctionRef<int(std::unique_ptr<int>)> ref(l);
EXPECT_EQ(42, ref(absl::make_unique<int>(42)));
}
TEST(FunctionRef, ReturnMoveOnly) {
auto l = [] { return absl::make_unique<int>(29); };
FunctionRef<std::unique_ptr<int>()> ref(l);
EXPECT_EQ(29, *ref());
}
TEST(FunctionRef, ManyArgs) {
auto l = [](int a, int b, int c) { return a + b + c; };
FunctionRef<int(int, int, int)> ref(l);
EXPECT_EQ(6, ref(1, 2, 3));
}
TEST(FunctionRef, VoidResultFromNonVoidFunctor) {
bool ran = false;
auto l = [&]() -> int {
ran = true;
return 2;
};
FunctionRef<void()> ref(l);
ref();
EXPECT_TRUE(ran);
}
TEST(FunctionRef, CastFromDerived) {
struct Base {};
struct Derived : public Base {};
Derived d;
auto l1 = [&](Base* b) { EXPECT_EQ(&d, b); };
FunctionRef<void(Derived*)> ref1(l1);
ref1(&d);
auto l2 = [&]() -> Derived* { return &d; };
FunctionRef<Base*()> ref2(l2);
EXPECT_EQ(&d, ref2());
}
TEST(FunctionRef, VoidResultFromNonVoidFuncton) {
FunctionRef<void()> ref(Function);
ref();
}
TEST(FunctionRef, MemberPtr) {
struct S {
int i;
};
S s{1100111};
auto mem_ptr = &S::i;
FunctionRef<int(const S& s)> ref(mem_ptr);
EXPECT_EQ(1100111, ref(s));
}
TEST(FunctionRef, MemberFun) {
struct S {
int i;
int get_i() const { return i; }
};
S s{22};
auto mem_fun_ptr = &S::get_i;
FunctionRef<int(const S& s)> ref(mem_fun_ptr);
EXPECT_EQ(22, ref(s));
}
TEST(FunctionRef, MemberFunRefqualified) {
struct S {
int i;
int get_i() && { return i; }
};
auto mem_fun_ptr = &S::get_i;
S s{22};
FunctionRef<int(S && s)> ref(mem_fun_ptr);
EXPECT_EQ(22, ref(std::move(s)));
}
#if !defined(_WIN32) && defined(GTEST_HAS_DEATH_TEST)
TEST(FunctionRef, MemberFunRefqualifiedNull) {
struct S {
int i;
int get_i() && { return i; }
};
auto mem_fun_ptr = &S::get_i;
mem_fun_ptr = nullptr;
EXPECT_DEBUG_DEATH({ FunctionRef<int(S && s)> ref(mem_fun_ptr); }, "");
}
TEST(FunctionRef, NullMemberPtrAssertFails) {
struct S {
int i;
};
using MemberPtr = int S::*;
MemberPtr mem_ptr = nullptr;
EXPECT_DEBUG_DEATH({ FunctionRef<int(const S& s)> ref(mem_ptr); }, "");
}
#endif // GTEST_HAS_DEATH_TEST
TEST(FunctionRef, CopiesAndMovesPerPassByValue) {
absl::test_internal::InstanceTracker tracker;
absl::test_internal::CopyableMovableInstance instance(0);
auto l = [](absl::test_internal::CopyableMovableInstance) {};
FunctionRef<void(absl::test_internal::CopyableMovableInstance)> ref(l);
ref(instance);
EXPECT_EQ(tracker.copies(), 1);
EXPECT_EQ(tracker.moves(), 1);
}
TEST(FunctionRef, CopiesAndMovesPerPassByRef) {
absl::test_internal::InstanceTracker tracker;
absl::test_internal::CopyableMovableInstance instance(0);
auto l = [](const absl::test_internal::CopyableMovableInstance&) {};
FunctionRef<void(const absl::test_internal::CopyableMovableInstance&)> ref(l);
ref(instance);
EXPECT_EQ(tracker.copies(), 0);
EXPECT_EQ(tracker.moves(), 0);
}
TEST(FunctionRef, CopiesAndMovesPerPassByValueCallByMove) {
absl::test_internal::InstanceTracker tracker;
absl::test_internal::CopyableMovableInstance instance(0);
auto l = [](absl::test_internal::CopyableMovableInstance) {};
FunctionRef<void(absl::test_internal::CopyableMovableInstance)> ref(l);
ref(std::move(instance));
EXPECT_EQ(tracker.copies(), 0);
EXPECT_EQ(tracker.moves(), 2);
}
TEST(FunctionRef, CopiesAndMovesPerPassByValueToRef) {
absl::test_internal::InstanceTracker tracker;
absl::test_internal::CopyableMovableInstance instance(0);
auto l = [](const absl::test_internal::CopyableMovableInstance&) {};
FunctionRef<void(absl::test_internal::CopyableMovableInstance)> ref(l);
ref(std::move(instance));
EXPECT_EQ(tracker.copies(), 0);
EXPECT_EQ(tracker.moves(), 1);
}
TEST(FunctionRef, PassByValueTypes) {
using absl::functional_internal::Invoker;
using absl::functional_internal::VoidPtr;
using absl::test_internal::CopyableMovableInstance;
struct Trivial {
void* p[2];
};
struct LargeTrivial {
void* p[3];
};
static_assert(std::is_same<Invoker<void, int>, void (*)(VoidPtr, int)>::value,
"Scalar types should be passed by value");
static_assert(
std::is_same<Invoker<void, Trivial>, void (*)(VoidPtr, Trivial)>::value,
"Small trivial types should be passed by value");
static_assert(std::is_same<Invoker<void, LargeTrivial>,
void (*)(VoidPtr, LargeTrivial &&)>::value,
"Large trivial types should be passed by rvalue reference");
static_assert(
std::is_same<Invoker<void, CopyableMovableInstance>,
void (*)(VoidPtr, CopyableMovableInstance &&)>::value,
"Types with copy/move ctor should be passed by rvalue reference");
// References are passed as references.
static_assert(
std::is_same<Invoker<void, int&>, void (*)(VoidPtr, int&)>::value,
"Reference types should be preserved");
static_assert(
std::is_same<Invoker<void, CopyableMovableInstance&>,
void (*)(VoidPtr, CopyableMovableInstance&)>::value,
"Reference types should be preserved");
static_assert(
std::is_same<Invoker<void, CopyableMovableInstance&&>,
void (*)(VoidPtr, CopyableMovableInstance &&)>::value,
"Reference types should be preserved");
// Make sure the address of an object received by reference is the same as the
// addess of the object passed by the caller.
{
LargeTrivial obj;
auto test = [&obj](LargeTrivial& input) { ASSERT_EQ(&input, &obj); };
absl::FunctionRef<void(LargeTrivial&)> ref(test);
ref(obj);
}
{
Trivial obj;
auto test = [&obj](Trivial& input) { ASSERT_EQ(&input, &obj); };
absl::FunctionRef<void(Trivial&)> ref(test);
ref(obj);
}
}
} // namespace
ABSL_NAMESPACE_END
} // namespace absl

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// 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.
// Implementation details for `absl::bind_front()`.
#ifndef ABSL_FUNCTIONAL_INTERNAL_FRONT_BINDER_H_
#define ABSL_FUNCTIONAL_INTERNAL_FRONT_BINDER_H_
#include <cstddef>
#include <type_traits>
#include <utility>
#include "absl/base/internal/invoke.h"
#include "absl/container/internal/compressed_tuple.h"
#include "absl/meta/type_traits.h"
#include "absl/utility/utility.h"
namespace absl {
ABSL_NAMESPACE_BEGIN
namespace functional_internal {
// Invoke the method, expanding the tuple of bound arguments.
template <class R, class Tuple, size_t... Idx, class... Args>
R Apply(Tuple&& bound, absl::index_sequence<Idx...>, Args&&... free) {
return base_internal::Invoke(
absl::forward<Tuple>(bound).template get<Idx>()...,
absl::forward<Args>(free)...);
}
template <class F, class... BoundArgs>
class FrontBinder {
using BoundArgsT = absl::container_internal::CompressedTuple<F, BoundArgs...>;
using Idx = absl::make_index_sequence<sizeof...(BoundArgs) + 1>;
BoundArgsT bound_args_;
public:
template <class... Ts>
constexpr explicit FrontBinder(absl::in_place_t, Ts&&... ts)
: bound_args_(absl::forward<Ts>(ts)...) {}
template <class... FreeArgs,
class R = base_internal::InvokeT<F&, BoundArgs&..., FreeArgs&&...>>
R operator()(FreeArgs&&... free_args) & {
return functional_internal::Apply<R>(bound_args_, Idx(),
absl::forward<FreeArgs>(free_args)...);
}
template <class... FreeArgs,
class R = base_internal::InvokeT<const F&, const BoundArgs&...,
FreeArgs&&...>>
R operator()(FreeArgs&&... free_args) const& {
return functional_internal::Apply<R>(bound_args_, Idx(),
absl::forward<FreeArgs>(free_args)...);
}
template <class... FreeArgs, class R = base_internal::InvokeT<
F&&, BoundArgs&&..., FreeArgs&&...>>
R operator()(FreeArgs&&... free_args) && {
// This overload is called when *this is an rvalue. If some of the bound
// arguments are stored by value or rvalue reference, we move them.
return functional_internal::Apply<R>(absl::move(bound_args_), Idx(),
absl::forward<FreeArgs>(free_args)...);
}
template <class... FreeArgs,
class R = base_internal::InvokeT<const F&&, const BoundArgs&&...,
FreeArgs&&...>>
R operator()(FreeArgs&&... free_args) const&& {
// This overload is called when *this is an rvalue. If some of the bound
// arguments are stored by value or rvalue reference, we move them.
return functional_internal::Apply<R>(absl::move(bound_args_), Idx(),
absl::forward<FreeArgs>(free_args)...);
}
};
template <class F, class... BoundArgs>
using bind_front_t = FrontBinder<decay_t<F>, absl::decay_t<BoundArgs>...>;
} // namespace functional_internal
ABSL_NAMESPACE_END
} // namespace absl
#endif // ABSL_FUNCTIONAL_INTERNAL_FRONT_BINDER_H_

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// 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_FUNCTIONAL_INTERNAL_FUNCTION_REF_H_
#define ABSL_FUNCTIONAL_INTERNAL_FUNCTION_REF_H_
#include <cassert>
#include <functional>
#include <type_traits>
#include "absl/base/internal/invoke.h"
#include "absl/meta/type_traits.h"
namespace absl {
ABSL_NAMESPACE_BEGIN
namespace functional_internal {
// Like a void* that can handle function pointers as well. The standard does not
// allow function pointers to round-trip through void*, but void(*)() is fine.
//
// Note: It's important that this class remains trivial and is the same size as
// a pointer, since this allows the compiler to perform tail-call optimizations
// when the underlying function is a callable object with a matching signature.
union VoidPtr {
const void* obj;
void (*fun)();
};
// Chooses the best type for passing T as an argument.
// Attempt to be close to SystemV AMD64 ABI. Objects with trivial copy ctor are
// passed by value.
template <typename T>
constexpr bool PassByValue() {
return !std::is_lvalue_reference<T>::value &&
absl::is_trivially_copy_constructible<T>::value &&
absl::is_trivially_copy_assignable<
typename std::remove_cv<T>::type>::value &&
std::is_trivially_destructible<T>::value &&
sizeof(T) <= 2 * sizeof(void*);
}
template <typename T>
struct ForwardT : std::conditional<PassByValue<T>(), T, T&&> {};
// An Invoker takes a pointer to the type-erased invokable object, followed by
// the arguments that the invokable object expects.
//
// Note: The order of arguments here is an optimization, since member functions
// have an implicit "this" pointer as their first argument, putting VoidPtr
// first allows the compiler to perform tail-call optimization in many cases.
template <typename R, typename... Args>
using Invoker = R (*)(VoidPtr, typename ForwardT<Args>::type...);
//
// InvokeObject and InvokeFunction provide static "Invoke" functions that can be
// used as Invokers for objects or functions respectively.
//
// static_cast<R> handles the case the return type is void.
template <typename Obj, typename R, typename... Args>
R InvokeObject(VoidPtr ptr, typename ForwardT<Args>::type... args) {
auto o = static_cast<const Obj*>(ptr.obj);
return static_cast<R>(
absl::base_internal::Invoke(*o, std::forward<Args>(args)...));
}
template <typename Fun, typename R, typename... Args>
R InvokeFunction(VoidPtr ptr, typename ForwardT<Args>::type... args) {
auto f = reinterpret_cast<Fun>(ptr.fun);
return static_cast<R>(
absl::base_internal::Invoke(f, std::forward<Args>(args)...));
}
template <typename Sig>
void AssertNonNull(const std::function<Sig>& f) {
assert(f != nullptr);
(void)f;
}
template <typename F>
void AssertNonNull(const F&) {}
template <typename F, typename C>
void AssertNonNull(F C::*f) {
assert(f != nullptr);
(void)f;
}
template <bool C>
using EnableIf = typename ::std::enable_if<C, int>::type;
} // namespace functional_internal
ABSL_NAMESPACE_END
} // namespace absl
#endif // ABSL_FUNCTIONAL_INTERNAL_FUNCTION_REF_H_