max4.cpp

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.
 */
// maximum of two values of any type
template <typename T>
inline T const& max (T const& a, T const& b)
{
    return  a < b ? b : a;
}

// maximum of three values of any type
template <typename T>
inline T const& max (T const& a, T const& b, T const& c)
{
    return max (max(a,b), c);  // uses the template version even for ints
}                              // because the following declaration comes
                               // too late:
// maximum of two int values
inline int const& max (int const& a, int const& b) 
{
    return  a < b ? b : a;
}