frac1in.hpp

stl自带源码

/* 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 <iostream>

inline
std::istream& operator >> (std::istream& strm, Fraction& f)
{
    int n, d;

    strm >> n;      // read value of the numerator
    strm.ignore();  // skip '/'
    strm >> d;      // read value of the denominator

    f = Fraction(n,d);  // assign the whole fraction

    return strm;
}