comparisonOperators.hpp

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// Copyright (c) 2020-2025 Cody R. Drisko. All rights reserved.
// Licensed under the MIT License. See the LICENSE file in the project root for more information.
//
// Name: comparisonOperators.hpp
// Author: crdrisko
// Date: 09/17/2020-12:36:17
// Description: An alternative to std::rel_opts which doesn't inject the comparison operators into the global namespace
 
#ifndef DRYCHEM_COMMON_UTILITIES_INCLUDE_COMMON_UTILS_UTILITIES_OPERATORS_COMPARISONOPERATORS_HPP
#define DRYCHEM_COMMON_UTILITIES_INCLUDE_COMMON_UTILS_UTILITIES_OPERATORS_COMPARISONOPERATORS_HPP
 
#include "common-utils/utilities/operators/potentiallyEmptyBaseClass.hpp"
 
namespace CppUtils::Operators
{
    template<typename Derived, typename Empty = PotentiallyEmptyBaseClass<Derived>>
    class EqualityComparable : public Empty
    {
    public:
        constexpr friend bool operator!=(const Derived& x1_, const Derived& x2_) { return !(x1_ == x2_); }
    };

    template<typename Derived, typename Empty = PotentiallyEmptyBaseClass<Derived>>
    class LessThanComparable : public Empty
    {
    public:
        constexpr friend bool operator>(const Derived& x1_, const Derived& x2_) { return x2_ < x1_; }
        constexpr friend bool operator<=(const Derived& x1_, const Derived& x2_) { return !(x2_ < x1_); }
        constexpr friend bool operator>=(const Derived& x1_, const Derived& x2_) { return !(x1_ < x2_); }
    };

    template<typename Derived, typename Empty = PotentiallyEmptyBaseClass<Derived>>
    class CompletelyComparable : public EqualityComparable<Derived, LessThanComparable<Derived, Empty>>
    {
    };
}   // namespace CppUtils::Operators
 
#endif