16d5db71b3
This reverts commit e476f968bc8e438a0435d10934f148de570db8eb. It has introduced a failure tracked by https://github.com/llvm/llvm-project/issues/150601 One libcxx test fail if libcxx is build with no exceptions and no RTTI: - libcxx/utilities/expected/expected.expected/value.observers.verify.cpp
86 lines
2.5 KiB
C++
86 lines
2.5 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, c++17, c++20
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// <functional>
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// template<class F, class... Args>
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// constexpr unspecified bind_back(F&& f, Args&&... args);
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#include <functional>
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#include "types.h"
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constexpr int pass(int n) { return n; }
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void test() {
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{ // Test calling constexpr function from non-constexpr `bind_back` result
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auto f1 = std::bind_back(pass, 1);
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static_assert(f1() == 1); // expected-error {{static assertion expression is not an integral constant expression}}
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}
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{ // Test calling `bind_back` with template function
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auto f1 = std::bind_back(do_nothing, 2);
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// expected-error@-1 {{no matching function for call to 'bind_back'}}
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}
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{ // Mandates: is_constructible_v<decay_t<F>, F>
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struct F {
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F() = default;
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F(const F&) = default;
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F(F&) = delete;
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void operator()() {}
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};
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F f;
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auto f1 = std::bind_back(f);
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// expected-error-re@*:* {{static assertion failed{{.*}}bind_back requires decay_t<F> to be constructible from F}}
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}
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{ // Mandates: is_move_constructible_v<decay_t<F>>
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struct F {
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F() = default;
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F(const F&) = default;
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F(F&&) = delete;
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void operator()() {}
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};
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F f;
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auto f1 = std::bind_back(f);
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// expected-error-re@*:* {{static assertion failed{{.*}}bind_back requires decay_t<F> to be move constructible}}
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}
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{ // Mandates: (is_constructible_v<decay_t<Args>, Args> && ...)
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struct Arg {
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Arg() = default;
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Arg(const Arg&) = default;
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Arg(Arg&) = delete;
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};
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Arg x;
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auto f = std::bind_back([](const Arg&) {}, x);
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// expected-error-re@*:* {{static assertion failed{{.*}}bind_back requires all decay_t<Args> to be constructible from respective Args}}
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// expected-error@*:* {{no matching constructor for initialization}}
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}
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{ // Mandates: (is_move_constructible_v<decay_t<Args>> && ...)
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struct Arg {
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Arg() = default;
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Arg(const Arg&) = default;
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Arg(Arg&&) = delete;
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};
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Arg x;
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auto f = std::bind_back([](Arg&) {}, x);
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// expected-error-re@*:* {{static assertion failed{{.*}}bind_back requires all decay_t<Args> to be move constructible}}
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}
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}
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