/***
    Copyright (C) 2022 J Reece Wilson (a/k/a "Reece"). All rights reserved.

    File: auCopyMoveUtils.hpp
    Date: 2022-2-1
    Author: Reece
***/
#pragma once

/**
 * @brief Upcasts R-Value upcastable @param arg.
 *        For an L-Value equivalent hint, use AuReference 
 * @tparam T 
 * @param arg 
 * @return 
*/
template <class T>
constexpr AuRemoveReference_t<T> &&AuMove(T &&arg)
{
    return static_cast<AuRemoveReference_t<T> &&>(arg);
}

/**
 * @brief Upcasts L-Value upcastable @param arg.
 *        For an R-Value equivalent hint, use AuMove
 * @tparam T An expression to implicitly upcast to an L-value
 * @param arg
 * @return
*/
template <class T>
constexpr T &AuReference(T &arg)
{
    return static_cast<T &>(arg);
}

/**
 * @brief Preserves R or L value without reducing; implicit AuMove or AuReference
 * @tparam T An expression to implicitly upcast to an R-value
 * @param arg 
 * @return 
*/
template <class T>
constexpr T &&AuForward(AuRemoveReference_t<T> &arg)
{
    return static_cast<T &&>(arg);
}

/**
 * @brief Preserves R or L value without reducing; implicit AuMove or AuReference
 * @tparam T
 * @param arg
 * @return
*/
template <class T>
constexpr T &&AuForward(AuRemoveReference_t<T> &&arg)
{
    return static_cast<T &&>(arg);
}

template <class T, class U = T>
inline T AuExchange(T &obj, U &&newValue)
{
    T oldValue = AuMove(obj);
    obj = AuForward<U>(newValue);
    return oldValue;
}

#if !defined(AURORA_RUNTIME_SWAP)
    #define AURORA_RUNTIME_SWAP std::swap
#endif

template <class T>
inline void AuSwap(T &a, T &b)
{
    AURORA_RUNTIME_SWAP(a, b);
}