1//===----------------------------------------------------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9// UNSUPPORTED: c++03, c++11, c++14
10
11// <functional>
12//
13// Make sure we can't initialize a std::function using an allocator (http://wg21.link/p0302r1).
14// These constructors were removed in C++17.
15
16#include <functional>
17#include <memory>
18
19struct S : public std::function<void()> { using function::function; };
20
21void f() {
22 S f1( [](){} );
23 S f2(std::allocator_arg, std::allocator<int>{}, f1); // expected-error {{no matching constructor for initialization of 'S'}}
24}
25

source code of libcxx/test/std/utilities/function.objects/func.wrap/func.wrap.func/derive_from.verify.cpp