7b00e9fae3
This completes the implementation of P1065 "constexpr INVOKE": http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2019/p1065r2.html This doesn't yet complete the implementation of P1032 "Misc constexpr bits," http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2018/p1032r1.html but it does complete all of the <functional> bits, which means that we can now set `__cpp_lib_constexpr_functional` for C++20. This could use more constexpr tests for `std::reference_wrapper<T>`, but the existing tests are extremely non-constexpr-friendly and so I don't want to get into that rabbit-hole today. Differential Revision: https://reviews.llvm.org/D93815
88 lines
1.8 KiB
C++
88 lines
1.8 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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// <functional>
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// template<Returnable R, class T, CopyConstructible... Args>
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// unspecified mem_fn(R (T::* pm)(Args...));
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#include <functional>
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#include <cassert>
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#include "test_macros.h"
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struct A
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{
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TEST_CONSTEXPR_CXX14 char test0() {return 'a';}
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TEST_CONSTEXPR_CXX14 char test1(int) {return 'b';}
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TEST_CONSTEXPR_CXX14 char test2(int, double) {return 'c';}
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};
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template <class F>
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TEST_CONSTEXPR_CXX20 bool
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test0(F f)
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{
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{
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A a;
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assert(f(a) == 'a');
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A* ap = &a;
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assert(f(ap) == 'a');
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const F& cf = f;
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assert(cf(ap) == 'a');
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}
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return true;
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}
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template <class F>
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TEST_CONSTEXPR_CXX20 bool
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test1(F f)
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{
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{
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A a;
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assert(f(a, 1) == 'b');
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A* ap = &a;
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assert(f(ap, 2) == 'b');
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const F& cf = f;
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assert(cf(ap, 2) == 'b');
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}
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return true;
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}
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template <class F>
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TEST_CONSTEXPR_CXX20 bool
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test2(F f)
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{
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{
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A a;
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assert(f(a, 1, 2) == 'c');
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A* ap = &a;
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assert(f(ap, 2, 3.5) == 'c');
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const F& cf = f;
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assert(cf(ap, 2, 3.5) == 'c');
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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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test0(std::mem_fn(&A::test0));
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test1(std::mem_fn(&A::test1));
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test2(std::mem_fn(&A::test2));
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#if TEST_STD_VER >= 11
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static_assert((noexcept(std::mem_fn(&A::test0))), ""); // LWG#2489
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#endif
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#if TEST_STD_VER >= 20
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static_assert(test0(std::mem_fn(&A::test0)));
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static_assert(test1(std::mem_fn(&A::test1)));
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static_assert(test2(std::mem_fn(&A::test2)));
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#endif
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return 0;
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}
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