examples/manual/num_get.cpp

/**************************************************************************
 *
 * numget.cpp - Example program for the numget facet. 
 *
 * $Id$
 *
 ***************************************************************************
 *
 * Copyright (c) 1994-2005 Quovadx,  Inc., acting through its  Rogue Wave
 * Software division. Licensed under the Apache License, Version 2.0 (the
 * "License");  you may  not use this file except  in compliance with the
 * License.    You    may   obtain   a   copy   of    the   License    at
 * http://www.apache.org/licenses/LICENSE-2.0.    Unless   required    by
 * applicable law  or agreed to  in writing,  software  distributed under
 * the License is distributed on an "AS IS" BASIS,  WITHOUT WARRANTIES OR
 * CONDITIONS OF  ANY KIND, either  express or implied.  See  the License
 * for the specific language governing permissions  and limitations under
 * the License.
 * 
 **************************************************************************/

#include <iostream>   // for cout, endl
#include <sstream>    // for istringstream
#include <string>     // for string


int main ()
{
    typedef std::istreambuf_iterator<char, std::char_traits<char> > Iter;
  
    std::ios::iostate state;
    Iter              end;

    bool        bval  = false;
    long        lval  = 0L;
    long double ldval = 0.0;

    // Get a num_get facet
    const std::num_get<char, Iter> &ng =
        std::use_facet<std::num_get<char, Iter> >(std::locale ());

#ifndef _RWSTD_NO_BOOL
    {
        // Build an istringstream from the buffer and construct
        // beginning and ending iterators on it.
        std::istringstream ins ("true");
        Iter begin (ins);

        // Set stream flags to recognize boolalpha input.
        ins.setf (std::ios::boolalpha);

        // Get the boolean value from the stream.
        ng.get (begin, end, ins, state, bval);
    }
#endif

    std::cout << bval << std::endl;

    {
        // Get the date
        std::istringstream ins ("2422235");
        Iter begin (ins);
        ng.get (begin, end, ins, state, lval);
    }

    std::cout << lval << std::endl;

    {
        // Get the weekday
        std::istringstream ins ("32324342.98908");
        Iter begin (ins);
        ng.get (begin, end, ins, state, ldval);
    }

    std::cout.setf (std::ios::fixed, std::ios::floatfield);
    std::cout << ldval << std::endl;

    return 0;
}