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//===----------------------------------------------------------------------===//
//
// 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
//
//===----------------------------------------------------------------------===//
// <functional>
// class function<R(ArgTypes...)>
// template<class F> function(F);
// Allow incomplete argument types in the __is_callable check
#include <functional>
#include <cassert>
#include "test_macros.h"
struct X{
typedef std::function<void(X&)> callback_type;
virtual ~X() {}
private:
callback_type _cb;
};
struct IncompleteReturnType {
std::function<IncompleteReturnType ()> fn;
};
int called = 0;
IncompleteReturnType test_fn() {
++called;
IncompleteReturnType I;
return I;
}
// See llvm.org/PR34298
void test_pr34298()
{
static_assert(std::is_copy_constructible<IncompleteReturnType>::value, "");
static_assert(std::is_copy_assignable<IncompleteReturnType>::value, "");
{
IncompleteReturnType X;
X.fn = test_fn;
const IncompleteReturnType& CX = X;
IncompleteReturnType X2 = CX;
assert(X2.fn);
assert(called == 0);
X2.fn();
assert(called == 1);
}
{
IncompleteReturnType Empty;
IncompleteReturnType X2 = Empty;
assert(!X2.fn);
}
}
int main(int, char**) {
test_pr34298();
return 0;
}
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