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AK: Add forward() overload that refuses to forward lvalue as rvalue

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This matches what other forward() implementations do.
This commit is contained in:
Andreas Kling 2020-04-07 14:31:49 +02:00
parent e54cc055ac
commit f8942411ac
1 changed files with 35 additions and 12 deletions
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47
AK/StdLibExtras.h
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@ -81,17 +81,6 @@ inline T&& move(T& arg)
# pragma clang diagnostic pop # pragma clang diagnostic pop
#endif #endif
template<typename T>
struct Identity {
typedef T Type;
};
template<class T>
inline constexpr T&& forward(typename Identity<T>::Type& param)
{
return static_cast<T&&>(param);
}
template<typename T, typename U> template<typename T, typename U>
inline T exchange(T& a, U&& b) inline T exchange(T& a, U&& b)
{ {
@ -150,6 +139,14 @@ struct IntegralConstant {
typedef IntegralConstant<bool, false> FalseType; typedef IntegralConstant<bool, false> FalseType;
typedef IntegralConstant<bool, true> TrueType; typedef IntegralConstant<bool, true> TrueType;
template<class T>
struct IsLvalueReference : FalseType {
};
template<class T>
struct IsLvalueReference<T&> : TrueType {
};
template<class T> template<class T>
struct __IsPointerHelper : FalseType { struct __IsPointerHelper : FalseType {
}; };
@ -293,11 +290,37 @@ struct Conditional<false, TrueType, FalseType> {
typedef FalseType Type; typedef FalseType Type;
}; };
template<typename T>
struct RemoveReference {
typedef T Type;
};
template<class T>
struct RemoveReference<T&> {
typedef T Type;
};
template<class T>
struct RemoveReference<T&&> {
typedef T Type;
};
template<class T>
inline constexpr T&& forward(typename RemoveReference<T>::Type& param)
{
return static_cast<T&&>(param);
}
template<class T>
inline constexpr T&& forward(typename RemoveReference<T>::Type&& param) noexcept
{
static_assert(!IsLvalueReference<T>::value, "Can't forward an rvalue as an lvalue.");
return static_cast<T&&>(param);
}
} }
using AK::Conditional;
using AK::ceil_div; using AK::ceil_div;
using AK::clamp; using AK::clamp;
using AK::Conditional;
using AK::exchange; using AK::exchange;
using AK::forward; using AK::forward;
using AK::IsSame; using AK::IsSame;