libcxx/test/utilities/function.objects/func.wrap/func.wrap.func/func.wrap.func.cap/operator_bool.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...)>

// explicit operator bool() const

#include <functional>
#include <cassert>

int g(int) {return 0;}

int main()
{
    {
    std::function<int(int)> f;
    assert(!f);
    f = g;
    assert(f);
    }
}