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Delete absl/utility/internal/if_constexpr.h

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PiperOrigin-RevId: 728798591
Change-Id: I86947936df752c706657d6cf1cf22178e4c0815c
This commit is contained in:
Derek Mauro
2025-02-19 13:40:25 -08:00
committed by Copybara-Service
parent c5d66dbfde
commit 14cfd97abe
5 changed files with 0 additions and 198 deletions
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1
CMake/AbseilDll.cmake
View File

@@ -444,7 +444,6 @@ set(ABSL_INTERNAL_DLL_FILES
"types/span.h"
"types/internal/span.h"
"types/variant.h"
"utility/internal/if_constexpr.h"
"utility/utility.h"
"debugging/leak_check.cc"
)

24
absl/utility/BUILD.bazel
View File

@@ -60,27 +60,3 @@ cc_test(
"@googletest//:gtest_main",
],
)
cc_library(
name = "if_constexpr",
hdrs = [
"internal/if_constexpr.h",
],
copts = ABSL_DEFAULT_COPTS,
linkopts = ABSL_DEFAULT_LINKOPTS,
deps = [
"//absl/base:config",
],
)
cc_test(
name = "if_constexpr_test",
srcs = ["internal/if_constexpr_test.cc"],
copts = ABSL_TEST_COPTS,
linkopts = ABSL_DEFAULT_LINKOPTS,
deps = [
":if_constexpr",
"@googletest//:gtest",
"@googletest//:gtest_main",
],
)

24
absl/utility/CMakeLists.txt
View File

@@ -42,27 +42,3 @@ absl_cc_test(
absl::strings
GTest::gmock_main
)
absl_cc_library(
NAME
if_constexpr
HDRS
"internal/if_constexpr.h"
COPTS
${ABSL_DEFAULT_COPTS}
DEPS
absl::config
PUBLIC
)
absl_cc_test(
NAME
if_constexpr_test
SRCS
"internal/if_constexpr_test.cc"
COPTS
${ABSL_TEST_COPTS}
DEPS
absl::if_constexpr
GTest::gmock_main
)

70
absl/utility/internal/if_constexpr.h
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@@ -1,70 +0,0 @@
// Copyright 2023 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.
// The IfConstexpr and IfConstexprElse utilities in this file are meant to be
// used to emulate `if constexpr` in pre-C++17 mode in library implementation.
// The motivation is to allow for avoiding complex SFINAE.
//
// The functions passed in must depend on the type(s) of the object(s) that
// require SFINAE. For example:
// template<typename T>
// int MaybeFoo(T& t) {
// if constexpr (HasFoo<T>::value) return t.foo();
// return 0;
// }
//
// can be written in pre-C++17 as:
//
// template<typename T>
// int MaybeFoo(T& t) {
// int i = 0;
// absl::utility_internal::IfConstexpr<HasFoo<T>::value>(
// [&](const auto& fooer) { i = fooer.foo(); }, t);
// return i;
// }
#ifndef ABSL_UTILITY_INTERNAL_IF_CONSTEXPR_H_
#define ABSL_UTILITY_INTERNAL_IF_CONSTEXPR_H_
#include <tuple>
#include <utility>
#include "absl/base/config.h"
namespace absl {
ABSL_NAMESPACE_BEGIN
namespace utility_internal {
template <bool condition, typename TrueFunc, typename FalseFunc,
typename... Args>
auto IfConstexprElse(TrueFunc&& true_func, FalseFunc&& false_func,
Args&&... args) {
return std::get<condition>(std::forward_as_tuple(
std::forward<FalseFunc>(false_func), std::forward<TrueFunc>(true_func)))(
std::forward<Args>(args)...);
}
template <bool condition, typename Func, typename... Args>
void IfConstexpr(Func&& func, Args&&... args) {
IfConstexprElse<condition>(std::forward<Func>(func), [](auto&&...){},
std::forward<Args>(args)...);
}
} // namespace utility_internal
ABSL_NAMESPACE_END
} // namespace absl
#endif // ABSL_UTILITY_INTERNAL_IF_CONSTEXPR_H_

79
absl/utility/internal/if_constexpr_test.cc
View File

@@ -1,79 +0,0 @@
// Copyright 2023 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/utility/internal/if_constexpr.h"
#include <utility>
#include "gtest/gtest.h"
namespace {
struct Empty {};
struct HasFoo {
int foo() const { return 1; }
};
TEST(IfConstexpr, Basic) {
int i = 0;
absl::utility_internal::IfConstexpr<false>(
[&](const auto& t) { i = t.foo(); }, Empty{});
EXPECT_EQ(i, 0);
absl::utility_internal::IfConstexpr<false>(
[&](const auto& t) { i = t.foo(); }, HasFoo{});
EXPECT_EQ(i, 0);
absl::utility_internal::IfConstexpr<true>(
[&](const auto& t) { i = t.foo(); }, HasFoo{});
EXPECT_EQ(i, 1);
}
TEST(IfConstexprElse, Basic) {
EXPECT_EQ(absl::utility_internal::IfConstexprElse<false>(
[&](const auto& t) { return t.foo(); }, [&](const auto&) { return 2; },
Empty{}), 2);
EXPECT_EQ(absl::utility_internal::IfConstexprElse<false>(
[&](const auto& t) { return t.foo(); }, [&](const auto&) { return 2; },
HasFoo{}), 2);
EXPECT_EQ(absl::utility_internal::IfConstexprElse<true>(
[&](const auto& t) { return t.foo(); }, [&](const auto&) { return 2; },
HasFoo{}), 1);
}
struct HasFooRValue {
int foo() && { return 1; }
};
struct RValueFunc {
void operator()(HasFooRValue&& t) && { *i = std::move(t).foo(); }
int* i = nullptr;
};
TEST(IfConstexpr, RValues) {
int i = 0;
RValueFunc func = {&i};
absl::utility_internal::IfConstexpr<false>(
std::move(func), HasFooRValue{});
EXPECT_EQ(i, 0);
func = RValueFunc{&i};
absl::utility_internal::IfConstexpr<true>(
std::move(func), HasFooRValue{});
EXPECT_EQ(i, 1);
}
} // namespace