35 lines
798 B
C++
35 lines
798 B
C++
// Function library
|
|
|
|
// Copyright (C) 2001-2003 Douglas Gregor
|
|
|
|
// Use, modification and distribution is subject to the Boost Software
|
|
// License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
|
|
// http://www.boost.org/LICENSE_1_0.txt)
|
|
|
|
// For more information, see http://www.boost.org/
|
|
|
|
|
|
#include <boost/function.hpp>
|
|
#include <iostream>
|
|
|
|
|
|
float mul_ints(int x, int y) { return ((float)x) * y; }
|
|
struct int_div {
|
|
float operator()(int x, int y) const { return ((float)x)/y; };
|
|
};
|
|
|
|
int main()
|
|
{
|
|
boost::function<float (int x, int y)> f;
|
|
f = int_div();
|
|
std::cout << f(5, 3) << std::endl;
|
|
if (f)
|
|
std::cout << f(5, 3) << std::endl;
|
|
else
|
|
std::cout << "f has no target, so it is unsafe to call" << std::endl;
|
|
f = 0;
|
|
f = &mul_ints;
|
|
|
|
return 0;
|
|
}
|