/*
    Scan Tailor - Interactive post-processing tool for scanned pages.
    Copyright (C)  Joseph Artsimovich <joseph.artsimovich@gmail.com>

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

#ifndef NUMERIC_TRAITS_H_
#define NUMERIC_TRAITS_H_

#include <limits>

namespace numeric_traits_impl
{

template<typename T, bool IsInteger> struct IntegerSpecific;

} // namespace numeric_traits_impl

/**
 * This class exists mainly because std::numeric_values<>::min() has
 * inconsistent behaviour for integer vs floating point types.
 */
template<typename T>
class NumericTraits
{
public:
    static T max()
    {
        return std::numeric_limits<T>::max();
    }

    /**
     * This one behaves as you expect, not as std::numeric_limits<T>::min().
     * That is, this one will actually give you a negative value both for
     * integer and floating point types.
     */
    static T min()
    {
        return numeric_traits_impl::IntegerSpecific <
               T, std::numeric_limits<T>::is_integer
               >::min();
    }
private:

};

namespace numeric_traits_impl
{

template<typename T>
struct IntegerSpecific<T, true> {
    static T min()
    {
        return std::numeric_limits<T>::min();
    }
};

template<typename T>
struct IntegerSpecific<T, false> {
    static T min()
    {
        return -std::numeric_limits<T>::max();
    }
};

} // namespace numeric_traits_impl

#endif
