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feat(templates): add initializer_list overloads to the in place constructor and emplace

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_Redstone_c_
2022-12-31 19:19:30 +08:00
parent 5338cd286a
commit 0709f209c8
5 changed files with 219 additions and 28 deletions
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36
Redcraft.Utility/Source/Public/Templates/Optional.h
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@ -66,6 +66,14 @@ public:
{
new (&Value) OptionalType(Forward<Ts>(Args)...);
}
/** Constructs an object with initial content an object, direct-non-list-initialized from IL, Forward<Ts>(Args).... */
template <typename U, typename... Ts> requires (CConstructibleFrom<OptionalType, initializer_list<U>, Ts...>)
FORCEINLINE constexpr explicit TOptional(FInPlace, initializer_list<U> IL, Ts&&... Args)
: bIsValid(true)
{
new (&Value) OptionalType(IL, Forward<Ts>(Args)...);
}
/** Copies content of other into a new instance. */
FORCEINLINE constexpr TOptional(const TOptional& InValue) requires (CTriviallyCopyConstructible<OptionalType>) = default;
@ -258,16 +266,36 @@ public:
* First destroys the current contained object (if any) by Reset(),
* then constructs an object, direct-non-list-initialized from Forward<Ts>(Args)..., as the contained object.
*
* @param Args - The arguments to be passed to the constructor of the object.
* @param Args - The arguments to be passed to the constructor of the object.
*
* @return A reference to the new object.
*/
template <typename... ArgTypes> requires (CConstructibleFrom<OptionalType, ArgTypes...>)
FORCEINLINE constexpr OptionalType& Emplace(ArgTypes&&... Args)
template <typename... Ts> requires (CConstructibleFrom<OptionalType, Ts...>)
FORCEINLINE constexpr OptionalType& Emplace(Ts&&... Args)
{
Reset();
OptionalType* Result = new (&Value) OptionalType(Forward<ArgTypes>(Args)...);
OptionalType* Result = new (&Value) OptionalType(Forward<Ts>(Args)...);
bIsValid = true;
return *Result;
}
/**
* Changes the contained object to one constructed from the arguments.
* First destroys the current contained object (if any) by Reset(),
* then constructs an object, direct-non-list-initialized from IL, Forward<Ts>(Args)..., as the contained object.
*
* @param IL, Args - The arguments to be passed to the constructor of the object.
*
* @return A reference to the new object.
*/
template <typename U, typename... Ts> requires (CConstructibleFrom<OptionalType, initializer_list<U>, Ts...>)
FORCEINLINE constexpr OptionalType& Emplace(initializer_list<U> IL, Ts&&... Args)
{
Reset();
OptionalType* Result = new (&Value) OptionalType(IL, Forward<Ts>(Args)...);
bIsValid = true;
return *Result;