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AK: Add forward() overload that refuses to forward lvalue as rvalue
This matches what other forward() implementations do.
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@ -81,17 +81,6 @@ inline T&& move(T& arg)
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# pragma clang diagnostic pop
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#endif
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template<typename T>
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struct Identity {
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typedef T Type;
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};
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template<class T>
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inline constexpr T&& forward(typename Identity<T>::Type& param)
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{
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return static_cast<T&&>(param);
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}
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template<typename T, typename U>
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inline T exchange(T& a, U&& b)
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{
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@ -150,6 +139,14 @@ struct IntegralConstant {
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typedef IntegralConstant<bool, false> FalseType;
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typedef IntegralConstant<bool, true> TrueType;
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template<class T>
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struct IsLvalueReference : FalseType {
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};
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template<class T>
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struct IsLvalueReference<T&> : TrueType {
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};
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template<class T>
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struct __IsPointerHelper : FalseType {
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};
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@ -293,11 +290,37 @@ struct Conditional<false, TrueType, FalseType> {
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typedef FalseType Type;
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};
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template<typename T>
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struct RemoveReference {
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typedef T Type;
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};
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template<class T>
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struct RemoveReference<T&> {
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typedef T Type;
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};
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template<class T>
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struct RemoveReference<T&&> {
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typedef T Type;
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};
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template<class T>
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inline constexpr T&& forward(typename RemoveReference<T>::Type& param)
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{
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return static_cast<T&&>(param);
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}
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template<class T>
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inline constexpr T&& forward(typename RemoveReference<T>::Type&& param) noexcept
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{
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static_assert(!IsLvalueReference<T>::value, "Can't forward an rvalue as an lvalue.");
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return static_cast<T&&>(param);
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}
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}
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using AK::Conditional;
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using AK::ceil_div;
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using AK::clamp;
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using AK::Conditional;
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using AK::exchange;
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using AK::forward;
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using AK::IsSame;
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