libcxx/test/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.mod/assign_F_alloc.pass.cpp

//===----------------------------------------------------------------------===//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//

// <functional>

// class function<R(ArgTypes...)>

// template<class F, class A> void assign(F&&, const A&);

#include <functional>
#include <cassert>

#include "../test_allocator.h"

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 main()
{
    {
    std::function<int(int)> f;
    f.assign(A(), test_allocator<A>());
    assert(A::count == 1);
    assert(f.target<A>());
    assert(f.target<int(*)(int)>() == 0);
    }
    assert(A::count == 0);
}