Valid Size Number Format in C++.

ValidNumberFmt.cc

#include <ios>
#include <iostream>
#include <iomanip>
#include <limits>

template <typename _NumberT>
class ValidNumberFmt
{
    _NumberT n;

public:
    inline ValidNumberFmt(_NumberT n)
    {
        this->n = n;
    }
    inline _NumberT getPrecision() const
    {
        return std::numeric_limits<_NumberT>::digits10;
    }
    inline _NumberT getValue() const
    {
        return n;
    }
};

template <typename _CharT, typename _Traits, typename _NumberT>
inline std::basic_ostream<_CharT, _Traits> &operator<<(std::basic_ostream<_CharT, _Traits> &__base, const ValidNumberFmt<_NumberT> nos)
{
    return __base << std::defaultfloat << std::setprecision(nos.getPrecision()) << nos.getValue();
}

int main(int argc, char *argv[])
{
    std::cout << ValidNumberFmt(12345678901) << "\t" << ValidNumberFmt(1.2345678901234567) << "\t" << ValidNumberFmt(1.2345678f);
    return 0;
}