io.cpp

Go to the documentation of this file.

/*****************************************************************************
    
    io.cpp -- Îïèñàíèå ñì. â ôàéëå io.hpp.

    Ýòîò ôàéë ÿâëÿåòñÿ ÷àñòüþ áèáëèîòåêè Arageli.

    Copyright (C) Nikolai Yu. Zolotykh, 1999--2006
    Copyright (C) Sergey S. Lyalin, 2005
    University of Nizhni Novgorod, Russia

*****************************************************************************/

#include "config.hpp"

#if !defined(ARAGELI_INCLUDE_CPP_WITH_EXPORT_TEMPLATE) || \
    defined(ARAGELI_INCLUDE_CPP_WITH_EXPORT_TEMPLATE_IO)

#include <iomanip>

#include "io.hpp"
#include "exception.hpp"
#include "cmp.hpp"


namespace Arageli
{


template <typename T, typename Ch, typename ChT>
std::basic_ostream<Ch, ChT>& output_polynom_internal_default
(std::basic_ostream<Ch, ChT>& out, const T& x)
{
    std::ios_base::fmtflags old_opts = out.flags();
    
    try { out << std::showpos << x; }
    catch(...)
    {
        out.flags(old_opts);
        throw;
    }

    out.flags(old_opts);
    return out;
}


template <typename T, typename Ch, typename ChT>
std::basic_ostream<Ch, ChT>& output_pow_default
(std::basic_ostream<Ch, ChT>& out, const T& x)
{
    // ÏÐÅÄÓÏÐÅÆÄÅÍÈÅ. Òîëüêî äëÿ òåõ T, äëÿ êîòîðûõ îïðåäåë¸í is_negative.
    
    if(is_negative(x))out << "(" << x << ")";
    else out << x;
    return out;
}


template <typename T, typename Ch, typename ChT>
std::basic_istream<Ch, ChT>& input_polynom_internal_default
(std::basic_istream<Ch, ChT>& in, T& x)
{
    char ch;
    in >> ch;
    if(!in)return in;

    // WARNING. The following implementation is restricted.
    
    bool minus = false;
    
    if(ch == '-')
    {// aligne minus sign to the next non-space characters
        char ch1;
        in >> ch1;  // pass spaces and read next character
        if(!in)return in;
        in.putback(ch1);
        
        if(ch1 == '(')
            minus = true;
        else
            in.putback(ch);
    }
    else if(ch != '+')
    {
        in.putback(ch);
        in.clear(std::ios_base::failbit);
    }

    T res;
    in >> res;
    if(!in && !in.eof())return in;
    if(minus)opposite(&res);

    x = res;
    return in;
}


template <typename T, typename Ch, typename ChT>
std::basic_istream<Ch, ChT>& input_polynom_first_default
(std::basic_istream<Ch, ChT>& in, T& x)
{
    char ch;
    in >> ch;
    if(!in)return in;

    // WARNING. The following implementation is restricted.
    
    bool minus = false;
    
    if(ch == '-')
    {// aligne minus sign to the next non-space characters
        char ch1;
        in >> ch1;  // pass spaces and read next character
        if(!in)return in;
        in.putback(ch1);
        
        if(ch1 == '(')
            minus = true;
        else
            in.putback(ch);
    }
    else if(ch != '+')
        in.putback(ch);

    T res;
    in >> res;
    if(!in && !in.eof())return in;
    if(minus)opposite(&res);

    x = res;
    return in;
}


} // namespace Arageli


#endif // #ifndef ARAGELI_INCLUDE_CPP_WITH_EXPORT_TEMPLATE

---