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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>
// requires CopyConstructible<F> && Callable<F, ArgTypes..>
// && Convertible<Callable<F, ArgTypes...>::result_type
// operator=(F f);
#include <functional>
#include <cassert>
#include "test_macros.h"
#include "count_new.hpp"
class A
{
int data_[10];
public:
static int count;
A()
{
++count;
for (int i = 0; i < 10; ++i)
data_[i] = i;
}
A(const A&) {++count;}
~A() {--count;}
int operator()(int i) const
{
for (int j = 0; j < 10; ++j)
i += data_[j];
return i;
}
int foo(int) const {return 1;}
};
int A::count = 0;
int g(int) {return 0;}
#if TEST_STD_VER >= 11
struct RValueCallable {
template <class ...Args>
void operator()(Args&&...) && {}
};
struct LValueCallable {
template <class ...Args>
void operator()(Args&&...) & {}
};
#endif
int main(int, char**)
{
assert(globalMemCounter.checkOutstandingNewEq(0));
{
std::function<int(int)> f;
f = A();
assert(A::count == 1);
assert(globalMemCounter.checkOutstandingNewEq(1));
assert(f.target<A>());
assert(f.target<int(*)(int)>() == 0);
}
assert(A::count == 0);
assert(globalMemCounter.checkOutstandingNewEq(0));
{
std::function<int(int)> f;
f = g;
assert(globalMemCounter.checkOutstandingNewEq(0));
assert(f.target<int(*)(int)>());
assert(f.target<A>() == 0);
}
assert(globalMemCounter.checkOutstandingNewEq(0));
{
std::function<int(int)> f;
f = (int (*)(int))0;
assert(!f);
assert(globalMemCounter.checkOutstandingNewEq(0));
assert(f.target<int(*)(int)>() == 0);
assert(f.target<A>() == 0);
}
{
std::function<int(const A*, int)> f;
f = &A::foo;
assert(f);
assert(globalMemCounter.checkOutstandingNewEq(0));
assert(f.target<int (A::*)(int) const>() != 0);
}
{
std::function<void(int)> f;
f = &g;
assert(f);
assert(f.target<int(*)(int)>() != 0);
f(1);
}
#if TEST_STD_VER >= 11
{
using Fn = std::function<void(int, int, int)>;
static_assert(std::is_assignable<Fn&, LValueCallable&>::value, "");
static_assert(std::is_assignable<Fn&, LValueCallable>::value, "");
static_assert(!std::is_assignable<Fn&, RValueCallable&>::value, "");
static_assert(!std::is_assignable<Fn&, RValueCallable>::value, "");
}
#endif
return 0;
}
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