EqualTo.h

//
// Copyright (C) 2018 Dr. Michael Steffens
//
// SPDX-License-Identifier: BSL-1.0
//


#ifndef JXXON_EqualTo_INCLUDED
#define JXXON_EqualTo_INCLUDED

#include "JXXON/IsSharedPtr.h"
#include <functional>

namespace JXXON {

template<typename T, typename Enable = void>
struct EqualTo;

template<typename T>
struct EqualTo<T, typename std::enable_if<!IsSharedPtr<T>::value>::type>
{
    bool operator()(const T& lhs, const T& rhs) const
    {
        return std::equal_to<T>()(lhs, rhs);
    }
};

template<typename T>
struct EqualTo<T, typename std::enable_if<IsSharedPtr<T>::value>::type>
{
    bool operator()(const T& lhs, const T& rhs) const
    {
        return lhs && rhs ? std::equal_to<typename T::element_type>()(*lhs, *rhs) : !lhs && !rhs;
    }
};

} // namespace JXXON

#endif // JXXON_EqualTo_INCLUDED