From b832dce8489ef7b6231384909fd9b68d5a5ff2b7 Mon Sep 17 00:00:00 2001 From: Abseil Team Date: Tue, 25 Feb 2020 22:27:31 +0100 Subject: Creation of LTS branch "lts_2020_02_25" - 0033c9ea91a52ade7c6b725aa2ef3cbe15463421 Fix build on FreeBSD/powerpc (#616) by kgotlinux <60880393+kgotlinux@users.noreply.github.com> - 0d5ce2797eb695aee7e019e25323251ef6ffc277 Export of internal Abseil changes by Abseil Team - b69c7d880caddfc25bf348dbcfe9d45fdd8bc6e6 Export of internal Abseil changes by Abseil Team - 2a5633fc077a58528cdbfe78720f3f6bfdc6044d Merge "Export of internal Abseil changes" by Xiaoyi Zhang - f9b3d6e493c1b6ab3dbdab71c5f8fa849db4abaf Add RISCV support to GetProgramCounter() (#621) by Khem Raj - 0232c87f21c26718aa3eb2d86678070f3b498a4e Add missing ABSL_HAVE_VDSO_SUPPORT conditional (#622) by Sinan Kaya <41809318+franksinankaya@users.noreply.github.com> - 3c814105108680997d0821077694f663693b5382 Export of internal Abseil changes by Abseil Team - c44657f55692eddf5504156645d1f4ec7b3acabd Export of internal Abseil changes by Abseil Team - 98eb410c93ad059f9bba1bf43f5bb916fc92a5ea Export of internal Abseil changes by Abseil Team - bf78e977309c4cb946914b456404141ddac1c302 Export of internal Abseil changes by Abseil Team - d95d1567165d449e4c213ea31a15cbb112a9865f Export of internal Abseil changes by Abseil Team - 24713a7036a81498334807fa5c7ad3cb7c643711 Export of internal Abseil changes by Abseil Team - 72382c21fefed981b4b8a2a1b82e2d231c2c2e39 Export of internal Abseil changes by Abseil Team - 08a7e7bf972c8451855a5022f2faf3d3655db015 Export of internal Abseil changes by Abseil Team - 36bcd9599b3f48c99357ba61cf33584889306d6a Fix pointer format specifier in documentation (#614) by Andre Nguyen - 0f86336b6939ea673cc1cbe29189286cae67d63a Export of internal Abseil changes by Abseil Team - c512f118dde6ffd51cb7d8ac8804bbaf4d266c3a Export of internal Abseil changes by Abseil Team - 37dd2562ec830d547a1524bb306be313ac3f2556 Export of internal Abseil changes by Abseil Team - 44427702614d7b86b064ba06a390f5eb2f85dbf6 fix: Add support for more ARM processors detection (#608) by Andre Nguyen - 159bf2bf6d1cc8087e02468d071e94d1177d1bae Export of internal Abseil changes by Abseil Team - a2e6adecc294dc4cd98cc285a9134ce58e0f2ad0 Use https links. 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Abseil Team - 2d2d7fbc283315b676159716376e739d3d23ed94 Export of internal Abseil changes by Abseil Team - 0302d1e5fa4fcdd1763b7d1bb3212943b1ae911d supppress unused variable warning for gcc (#372) by Martin - 262d74ba81b1fc4d71f459555cde8ecb39786d68 Export of internal Abseil changes by Abseil Team - f0afae0d49af3e15a7169e019634d7719143d94d Export of internal Abseil changes by Abseil Team - 0e7afdcbd24c7e5b7cab4e0217d8886f1525b520 Export of internal Abseil changes by Abseil Team - 9a41ffdd3a0ccbcdd29c4e3886b28e06f2cd9c66 Export of internal Abseil changes by Abseil Team - 36910d3d7e9fccadd6603f232d0c4f54dcd47c7e [bazel] Add fixes for --incompatible_load_cc_rules_from_b... by Yannic - aae8143cf9aa611f70d7ea9b95b8b8b383b2271a Export of internal Abseil changes by Abseil Team - d9aa92d7fb324314f9df487ac23d32a25650b742 Export of internal Abseil changes by Abseil Team - 321ab5303023c86cd15d9ddc5740fb4b4fde32e1 Export of internal Abseil changes by Abseil Team - 4ef574064e75b86f115549e9eb4c7e806781b3ab Export of internal Abseil changes by Abseil Team GitOrigin-RevId: 0033c9ea91a52ade7c6b725aa2ef3cbe15463421 Change-Id: I8a2b70063cb3ab40c6943a6db0fe40cae71ed8d7 --- absl/functional/bind_front_test.cc | 231 +++++++++++++++++++++++++++++++++++++ 1 file changed, 231 insertions(+) create mode 100644 absl/functional/bind_front_test.cc (limited to 'absl/functional/bind_front_test.cc') diff --git a/absl/functional/bind_front_test.cc b/absl/functional/bind_front_test.cc new file mode 100644 index 00000000..4801a81c --- /dev/null +++ b/absl/functional/bind_front_test.cc @@ -0,0 +1,231 @@ +// 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 + +#include +#include +#include + +#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(i))); + EXPECT_EQ("const&", absl::bind_front(f)(static_cast(i))); + EXPECT_EQ("&&", absl::bind_front(f)(static_cast(i))); + EXPECT_EQ("const&&", absl::bind_front(f)(static_cast(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 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 p) { + return *p; +} + +std::unique_ptr Factory(int n) { return absl::make_unique(n); } + +TEST(BindTest, NonCopyableArg) { + EXPECT_EQ(42, absl::bind_front(Sink)(absl::make_unique(42))); + EXPECT_EQ(42, absl::bind_front(Sink, absl::make_unique(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> is true but an attempt to +// instantiate the copy constructor leads to a compile error. This is similar +// to how standard containers behave. +template +struct FalseCopyable { + FalseCopyable() {} + FalseCopyable(const FalseCopyable& other) : m(other.m) {} + FalseCopyable(FalseCopyable&& other) : m(std::move(other.m)) {} + T m; +}; + +int GetMember(FalseCopyable> x) { return *x.m; } + +TEST(BindTest, WrappedMoveOnly) { + FalseCopyable> x; + x.m = absl::make_unique(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 -- cgit v1.2.3