UE::MakeStatefulInheritedContextExtension

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Description

Creates an FInheritedContextExtension with custom scope callbacks and co-allocated mutable state. The state of type T is constructed in-place inside a derived FInterface and owned by the handle's TSharedPtr, so it lives exactly as long as the last copy of the extension handle. ApplyFn() is called when a task starts executing and returns saved state (preserved per-scope). RestoreFn(SavedState, SharedState) is called when the task scope ends. Access the state after construction via Ext.GetState().

Usage (timing accumulation): double OnStartTiming() { return FPlatformTime::Seconds(); } void OnStopTiming(const double& Start, std::atomic& Acc) { Acc.fetch_add(FPlatformTime::Seconds() - Start, std::memory_order_relaxed); } auto Ext = MakeStatefulInheritedContextExtension<&OnStartTiming, &OnStopTiming, std::atomic>(0.0); FInheritedContextExtensionScope Scope(Ext); // ... launch tasks ... double Result = Ext.GetState>().load();

namespace UE  
{  
    template<auto ApplyFn, auto RestoreFn, typename T, typename... ArgsType>  
    FInheritedContextExtension UE::MakeStatefulInheritedContextExtension  
    (  
        ArgsType &&... Args  
    )  
}  
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namespace UE {     template<auto ApplyFn, auto RestoreFn, typename T, typename... ArgsType>     FInheritedContextExtension UE::MakeStatefulInheritedContextExtension     (         ArgsType &&... Args     ) }