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libcxx_old/test/std/utilities/function.objects/func.wrap/func.wrap.func/derive_from.pass.cpp

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C++

//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// UNSUPPORTED: c++98, c++03
// <functional>
// See https://bugs.llvm.org/show_bug.cgi?id=20002
#include <functional>
#include <type_traits>
#include "test_macros.h"
using Fn = std::function<void()>;
struct S : public std::function<void()> { using function::function; };
int main(int, char**) {
S s( [](){} );
S f1( s );
#if TEST_STD_VER <= 14
S f2(std::allocator_arg, std::allocator<int>{}, s);
#endif
return 0;
}