funcptr.hpp

C++ Templates 完全导引范例

/* The following code example is taken from the book
 * "C++ Templates - The Complete Guide"
 * by David Vandevoorde and Nicolai M. Josuttis, Addison-Wesley, 2002
 *
 * (C) Copyright David Vandevoorde and Nicolai M. Josuttis 2002.
 * 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 "functionptr.hpp"

template<typename RT> inline
FunctionPtr<RT> func_ptr (RT (*fp)()) 
{
    return FunctionPtr<RT>(fp);
}

template<typename RT, typename P1> inline
FunctionPtr<RT,P1> func_ptr (RT (*fp)(P1)) 
{
    return FunctionPtr<RT,P1>(fp);
}

template<typename RT, typename P1, typename P2> inline
FunctionPtr<RT,P1,P2> func_ptr (RT (*fp)(P1,P2)) 
{
    return FunctionPtr<RT,P1,P2>(fp);
}

template<typename RT, typename P1, typename P2, typename P3> inline
FunctionPtr<RT,P1,P2,P3> func_ptr (RT (*fp)(P1,P2,P3)) 
{
    return FunctionPtr<RT,P1,P2,P3>(fp);
}