463 lines
15 KiB
C++
463 lines
15 KiB
C++
//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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// UNSUPPORTED: c++03, c++11, c++14
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// template <class F> unspecified not_fn(F&& f);
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#include <functional>
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#include <type_traits>
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#include <string>
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#include <cassert>
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#include "test_macros.h"
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#include "type_id.h"
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#include "callable_types.h"
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///////////////////////////////////////////////////////////////////////////////
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// BOOL TEST TYPES
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///////////////////////////////////////////////////////////////////////////////
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struct EvilBool {
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static int bang_called;
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EvilBool(EvilBool const&) = default;
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EvilBool(EvilBool&&) = default;
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friend EvilBool operator!(EvilBool const& other) {
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++bang_called;
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return EvilBool{!other.value};
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}
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private:
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friend struct MoveOnlyCallable<EvilBool>;
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friend struct CopyCallable<EvilBool>;
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friend struct NoExceptCallable<EvilBool>;
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constexpr explicit EvilBool(bool x) : value(x) {}
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EvilBool& operator=(EvilBool const& other) = default;
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public:
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bool value;
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};
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int EvilBool::bang_called = 0;
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struct ExplicitBool {
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ExplicitBool(ExplicitBool const&) = default;
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ExplicitBool(ExplicitBool&&) = default;
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constexpr explicit operator bool() const { return value; }
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private:
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friend struct MoveOnlyCallable<ExplicitBool>;
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friend struct CopyCallable<ExplicitBool>;
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constexpr explicit ExplicitBool(bool x) : value(x) {}
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constexpr ExplicitBool& operator=(bool x) {
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value = x;
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return *this;
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}
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bool value;
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};
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struct NoExceptEvilBool {
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NoExceptEvilBool(NoExceptEvilBool const&) = default;
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NoExceptEvilBool(NoExceptEvilBool&&) = default;
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NoExceptEvilBool& operator=(NoExceptEvilBool const& other) = default;
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constexpr explicit NoExceptEvilBool(bool x) : value(x) {}
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friend NoExceptEvilBool operator!(NoExceptEvilBool const& other) noexcept {
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return NoExceptEvilBool{!other.value};
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}
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bool value;
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};
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TEST_CONSTEXPR_CXX20
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bool constructor_tests()
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{
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{
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using T = MoveOnlyCallable<bool>;
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T value(true);
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using RetT = decltype(std::not_fn(std::move(value)));
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static_assert(std::is_move_constructible<RetT>::value, "");
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static_assert(!std::is_copy_constructible<RetT>::value, "");
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static_assert(!std::is_move_assignable<RetT>::value, "");
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static_assert(!std::is_copy_assignable<RetT>::value, "");
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auto ret = std::not_fn(std::move(value));
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// test it was moved from
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assert(value.value == false);
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// test that ret() negates the original value 'true'
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assert(ret() == false);
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assert(ret(0, 0.0, "blah") == false);
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// Move ret and test that it was moved from and that ret2 got the
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// original value.
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auto ret2 = std::move(ret);
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assert(ret() == true);
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assert(ret2() == false);
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assert(ret2(42) == false);
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}
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{
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using T = CopyCallable<bool>;
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T value(false);
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using RetT = decltype(std::not_fn(value));
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static_assert(std::is_move_constructible<RetT>::value, "");
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static_assert(std::is_copy_constructible<RetT>::value, "");
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static_assert(!std::is_move_assignable<RetT>::value, "");
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static_assert(!std::is_copy_assignable<RetT>::value, "");
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auto ret = std::not_fn(value);
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// test that value is unchanged (copied not moved)
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assert(value.value == false);
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// test 'ret' has the original value
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assert(ret() == true);
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assert(ret(42, 100) == true);
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// move from 'ret' and check that 'ret2' has the original value.
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auto ret2 = std::move(ret);
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assert(ret() == false);
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assert(ret2() == true);
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assert(ret2("abc") == true);
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// initialize not_fn with rvalue
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auto ret3 = std::not_fn(std::move(value));
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assert(ret(0) == false);
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assert(ret3(0) == true);
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}
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{
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using T = CopyAssignableWrapper;
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T value(true);
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T value2(false);
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using RetT = decltype(std::not_fn(value));
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static_assert(std::is_move_constructible<RetT>::value, "");
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static_assert(std::is_copy_constructible<RetT>::value, "");
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auto ret = std::not_fn(value);
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assert(ret() == false);
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auto ret2 = std::not_fn(value2);
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assert(ret2() == true);
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}
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{
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using T = MoveAssignableWrapper;
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T value(true);
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T value2(false);
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using RetT = decltype(std::not_fn(std::move(value)));
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static_assert(std::is_move_constructible<RetT>::value, "");
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static_assert(!std::is_copy_constructible<RetT>::value, "");
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static_assert(!std::is_copy_assignable<RetT>::value, "");
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auto ret = std::not_fn(std::move(value));
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assert(ret() == false);
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auto ret2 = std::not_fn(std::move(value2));
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assert(ret2() == true);
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}
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return true;
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}
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void return_type_tests()
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{
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using std::is_same;
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{
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using T = CopyCallable<bool>;
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auto ret = std::not_fn(T{false});
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static_assert(is_same<decltype(ret()), bool>::value, "");
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static_assert(is_same<decltype(ret("abc")), bool>::value, "");
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assert(ret() == true);
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}
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{
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using T = CopyCallable<ExplicitBool>;
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auto ret = std::not_fn(T{true});
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static_assert(is_same<decltype(ret()), bool>::value, "");
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static_assert(is_same<decltype(ret(std::string("abc"))), bool>::value, "");
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assert(ret() == false);
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}
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{
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using T = CopyCallable<EvilBool>;
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auto ret = std::not_fn(T{false});
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static_assert(is_same<decltype(ret()), EvilBool>::value, "");
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EvilBool::bang_called = 0;
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auto value_ret = ret();
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assert(EvilBool::bang_called == 1);
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assert(value_ret.value == true);
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ret();
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assert(EvilBool::bang_called == 2);
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}
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}
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// Other tests only test using objects with call operators. Test various
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// other callable types here.
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TEST_CONSTEXPR_CXX20
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bool other_callable_types_test()
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{
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{ // test with function pointer
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auto ret = std::not_fn(returns_true);
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assert(ret() == false);
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}
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{ // test with lambda
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auto returns_value = [](bool value) { return value; };
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auto ret = std::not_fn(returns_value);
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assert(ret(true) == false);
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assert(ret(false) == true);
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}
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{ // test with pointer to member function
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MemFunCallable mt(true);
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const MemFunCallable mf(false);
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auto ret = std::not_fn(&MemFunCallable::return_value);
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assert(ret(mt) == false);
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assert(ret(mf) == true);
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assert(ret(&mt) == false);
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assert(ret(&mf) == true);
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}
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{ // test with pointer to member function
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MemFunCallable mt(true);
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MemFunCallable mf(false);
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auto ret = std::not_fn(&MemFunCallable::return_value_nc);
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assert(ret(mt) == false);
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assert(ret(mf) == true);
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assert(ret(&mt) == false);
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assert(ret(&mf) == true);
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}
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{ // test with pointer to member data
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MemFunCallable mt(true);
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const MemFunCallable mf(false);
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auto ret = std::not_fn(&MemFunCallable::value);
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assert(ret(mt) == false);
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assert(ret(mf) == true);
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assert(ret(&mt) == false);
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assert(ret(&mf) == true);
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}
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return true;
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}
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void throws_in_constructor_test()
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{
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#ifndef TEST_HAS_NO_EXCEPTIONS
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struct ThrowsOnCopy {
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ThrowsOnCopy(ThrowsOnCopy const&) {
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throw 42;
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}
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ThrowsOnCopy() = default;
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bool operator()() const {
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assert(false);
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#ifdef TEST_COMPILER_MSVC
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__assume(0);
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#else
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__builtin_unreachable();
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#endif
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}
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};
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{
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ThrowsOnCopy cp;
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try {
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(void)std::not_fn(cp);
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assert(false);
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} catch (int const& value) {
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assert(value == 42);
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}
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}
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#endif
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}
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TEST_CONSTEXPR_CXX20
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bool call_operator_sfinae_test() {
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{ // wrong number of arguments
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using T = decltype(std::not_fn(returns_true));
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static_assert(std::is_invocable<T>::value, ""); // callable only with no args
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static_assert(!std::is_invocable<T, bool>::value, "");
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}
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{ // violates const correctness (member function pointer)
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using T = decltype(std::not_fn(&MemFunCallable::return_value_nc));
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static_assert(std::is_invocable<T, MemFunCallable&>::value, "");
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static_assert(!std::is_invocable<T, const MemFunCallable&>::value, "");
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}
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{ // violates const correctness (call object)
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using Obj = CopyCallable<bool>;
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using NCT = decltype(std::not_fn(Obj{true}));
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using CT = const NCT;
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static_assert(std::is_invocable<NCT>::value, "");
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static_assert(!std::is_invocable<CT>::value, "");
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}
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{ // returns bad type with no operator!
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auto fn = [](auto x) { return x; };
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using T = decltype(std::not_fn(fn));
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static_assert(std::is_invocable<T, bool>::value, "");
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static_assert(!std::is_invocable<T, std::string>::value, "");
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}
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return true;
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}
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TEST_CONSTEXPR_CXX20
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bool call_operator_forwarding_test()
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{
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using Fn = ForwardingCallObject;
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Fn::State st;
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auto obj = std::not_fn(Fn{st});
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const auto& c_obj = obj;
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{ // test zero args
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obj();
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assert(st.check_call<>(CT_NonConst | CT_LValue));
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std::move(obj)();
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assert(st.check_call<>(CT_NonConst | CT_RValue));
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c_obj();
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assert(st.check_call<>(CT_Const | CT_LValue));
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std::move(c_obj)();
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assert(st.check_call<>(CT_Const | CT_RValue));
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}
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{ // test value categories
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int x = 42;
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const int cx = 42;
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obj(x);
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assert(st.check_call<int&>(CT_NonConst | CT_LValue));
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obj(cx);
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assert(st.check_call<const int&>(CT_NonConst | CT_LValue));
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obj(std::move(x));
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assert(st.check_call<int&&>(CT_NonConst | CT_LValue));
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obj(std::move(cx));
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assert(st.check_call<const int&&>(CT_NonConst | CT_LValue));
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obj(42);
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assert(st.check_call<int&&>(CT_NonConst | CT_LValue));
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}
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{ // test value categories - rvalue
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int x = 42;
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const int cx = 42;
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std::move(obj)(x);
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assert(st.check_call<int&>(CT_NonConst | CT_RValue));
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std::move(obj)(cx);
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assert(st.check_call<const int&>(CT_NonConst | CT_RValue));
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std::move(obj)(std::move(x));
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assert(st.check_call<int&&>(CT_NonConst | CT_RValue));
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std::move(obj)(std::move(cx));
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assert(st.check_call<const int&&>(CT_NonConst | CT_RValue));
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std::move(obj)(42);
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assert(st.check_call<int&&>(CT_NonConst | CT_RValue));
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}
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{ // test value categories - const call
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int x = 42;
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const int cx = 42;
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c_obj(x);
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assert(st.check_call<int&>(CT_Const | CT_LValue));
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c_obj(cx);
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assert(st.check_call<const int&>(CT_Const | CT_LValue));
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c_obj(std::move(x));
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assert(st.check_call<int&&>(CT_Const | CT_LValue));
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c_obj(std::move(cx));
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assert(st.check_call<const int&&>(CT_Const | CT_LValue));
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c_obj(42);
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assert(st.check_call<int&&>(CT_Const | CT_LValue));
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}
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{ // test value categories - const call rvalue
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int x = 42;
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const int cx = 42;
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std::move(c_obj)(x);
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assert(st.check_call<int&>(CT_Const | CT_RValue));
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std::move(c_obj)(cx);
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assert(st.check_call<const int&>(CT_Const | CT_RValue));
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std::move(c_obj)(std::move(x));
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assert(st.check_call<int&&>(CT_Const | CT_RValue));
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std::move(c_obj)(std::move(cx));
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assert(st.check_call<const int&&>(CT_Const | CT_RValue));
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std::move(c_obj)(42);
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assert(st.check_call<int&&>(CT_Const | CT_RValue));
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}
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{ // test multi arg
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using String = const char *;
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const double y = 3.14;
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String s = "abc";
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obj(42, std::move(y), s, String{"foo"});
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assert((st.check_call<int&&, const double&&, String&, String&&>(CT_NonConst | CT_LValue)));
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std::move(obj)(42, std::move(y), s, String{"foo"});
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assert((st.check_call<int&&, const double&&, String&, String&&>(CT_NonConst | CT_RValue)));
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c_obj(42, std::move(y), s, String{"foo"});
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assert((st.check_call<int&&, const double&&, String&, String&&>(CT_Const | CT_LValue)));
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std::move(c_obj)(42, std::move(y), s, String{"foo"});
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assert((st.check_call<int&&, const double&&, String&, String&&>(CT_Const | CT_RValue)));
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}
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return true;
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}
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TEST_CONSTEXPR_CXX20
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bool call_operator_noexcept_test()
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{
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{
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using T = ConstCallable<bool>;
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T value(true);
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auto ret = std::not_fn(value);
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static_assert(!noexcept(ret()), "call should not be noexcept");
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auto const& cret = ret;
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static_assert(!noexcept(cret()), "call should not be noexcept");
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}
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{
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using T = NoExceptCallable<bool>;
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T value(true);
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auto ret = std::not_fn(value);
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LIBCPP_STATIC_ASSERT(noexcept(!_VSTD::__invoke(value)), "");
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#if TEST_STD_VER > 14
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static_assert(noexcept(!std::invoke(value)), "");
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#endif
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static_assert(noexcept(ret()), "call should be noexcept");
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auto const& cret = ret;
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static_assert(noexcept(cret()), "call should be noexcept");
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}
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{
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using T = NoExceptCallable<NoExceptEvilBool>;
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T value(true);
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auto ret = std::not_fn(value);
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static_assert(noexcept(ret()), "call should not be noexcept");
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auto const& cret = ret;
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static_assert(noexcept(cret()), "call should not be noexcept");
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}
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{
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using T = NoExceptCallable<EvilBool>;
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T value(true);
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auto ret = std::not_fn(value);
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static_assert(!noexcept(ret()), "call should not be noexcept");
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auto const& cret = ret;
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static_assert(!noexcept(cret()), "call should not be noexcept");
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}
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return true;
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}
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TEST_CONSTEXPR_CXX20
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bool test_lwg2767() {
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// See https://cplusplus.github.io/LWG/lwg-defects.html#2767
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struct Abstract { virtual void f() const = 0; };
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struct Derived : public Abstract { void f() const {} };
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struct F { constexpr bool operator()(Abstract&&) { return false; } };
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{
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Derived d;
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Abstract &a = d;
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bool b = std::not_fn(F{})(std::move(a));
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assert(b);
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}
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return true;
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}
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int main(int, char**)
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{
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constructor_tests();
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return_type_tests();
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other_callable_types_test();
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throws_in_constructor_test();
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call_operator_sfinae_test(); // somewhat of an extension
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call_operator_forwarding_test();
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call_operator_noexcept_test();
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test_lwg2767();
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#if TEST_STD_VER >= 20
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static_assert(constructor_tests());
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static_assert(other_callable_types_test());
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static_assert(call_operator_sfinae_test()); // somewhat of an extension
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static_assert(call_operator_forwarding_test());
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static_assert(call_operator_noexcept_test());
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static_assert(test_lwg2767());
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#endif
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return 0;
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}
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