num_get.cpp

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