floating.hpp

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//=======================================================================
// Copyright (c) 2013 Piotr Wygocki, Maciej Andrejczuk
//
// Distributed under the Boost Software License, Version 1.0. (See
// accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
//=======================================================================
#ifndef PAAL_FLOATING_HPP
#define PAAL_FLOATING_HPP

#include <limits>
#include <cmath>
#include <random>

namespace paal {
namespace utils {

template <typename T>
class compare {
    T const m_epsilon;
public:
    compare(T epsilon = std::numeric_limits<T>::epsilon()): m_epsilon(epsilon) {}

    bool e(T a, T b) const {
        return std::abs(a - b) < m_epsilon;
        // return abs(a -b ) < m_epsilon; //this line breaks
        // generalised_assignment_long_test TODO investigate
    }

    bool g(T a, T b) const { return a > b + m_epsilon; }

    bool ge(T a, T b) const { return a >= b - m_epsilon; }

    bool le(T a, T b) const { return a <= b + m_epsilon; }

    double get_epsilon() const { return m_epsilon; }


    static T default_epsilon() { return std::numeric_limits<T>::epsilon(); }
};

} // utils
} // paal

#endif // PAAL_FLOATING_HPP