fopow.hpp

来自「stl自带源码」· HPP 代码 · 共 21 行

/* The following code example is taken from the book
 * "The C++ Standard Library - A Tutorial and Reference"
 * by Nicolai M. Josuttis, Addison-Wesley, 1999
 *
 * (C) Copyright Nicolai M. Josuttis 1999.
 * Permission to copy, use, modify, sell and distribute this software
 * is granted provided this copyright notice appears in all copies.
 * This software is provided "as is" without express or implied
 * warranty, and with no claim as to its suitability for any purpose.
 */
#include <functional>
#include <cmath>

template <class T1, class T2>         
struct fopow : public std::binary_function<T1, T2, T1>
{
    T1 operator() (T1 base, T2 exp) const {
        return std::pow(base,exp);
    }
};