13f5579cae
std::bind is supposed to be constexpr-friendly since C++20 and it was marked as such in our synopsis. However, the tests were not actually testing any of it and as it happens, std::bind was not really constexpr friendly. This fixes the issue and makes sure that at least some of the tests are running in constexpr mode. Some tests for std::bind check functions that return void, and those use global variables. These tests haven't been made constexpr-friendly, however the coverage added by this patch should be sufficient to get decent confidence. Differential Revision: https://reviews.llvm.org/D149295
56 lines
1.3 KiB
C++
56 lines
1.3 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
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// <functional>
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// template<CopyConstructible Fn, CopyConstructible... Types>
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// unspecified bind(Fn, Types...); // constexpr since C++20
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// template<Returnable R, CopyConstructible Fn, CopyConstructible... Types>
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// unspecified bind(Fn, Types...); // constexpr since C++20
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// https://llvm.org/PR16343
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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 multiply {
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template <typename T>
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TEST_CONSTEXPR_CXX20 T operator()(T a, T b) {
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return a * b;
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}
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};
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struct plus_one {
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template <typename T>
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TEST_CONSTEXPR_CXX20 T operator()(T a) {
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return a + 1;
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}
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};
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TEST_CONSTEXPR_CXX20 bool test() {
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using std::placeholders::_1;
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auto g = std::bind(multiply(), 2, _1);
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assert(g(5) == 10);
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assert(std::bind(plus_one(), g)(5) == 11);
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return true;
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}
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int main(int, char**) {
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test();
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#if TEST_STD_VER >= 20
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static_assert(test());
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#endif
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return 0;
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}
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