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7f5df95274
#rb none #preflight 62869724f15d967ff4d1e712 [CL 20286015 by Dan Thompson in ue5-main branch]
60 lines
1.7 KiB
C++
60 lines
1.7 KiB
C++
// Copyright Epic Games, Inc. All Rights Reserved.
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#pragma once
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#include "DerivedDataBuildFunction.h"
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#include "Features/IModularFeatures.h"
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#include "UObject/NameTypes.h"
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namespace UE::DerivedData
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{
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/** DO NOT USE DIRECTLY. Base for the build function factory. Use TBuildFunctionFactory. */
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class IBuildFunctionFactory : public IModularFeature
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{
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public:
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static inline const FLazyName FeatureName{"BuildFunctionFactory"};
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/** Returns the build function associated with this factory. */
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virtual const IBuildFunction& GetFunction() const = 0;
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};
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/**
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* Factory that creates and registers a build function.
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*
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* A build function must be registered by a build function factory before it can execute a build.
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* Register a function in the source file that implements it or in the corresponding module.
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*
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* Examples:
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* static const TBuildFunctionFactory<FExampleFunction> ExampleFunctionFactory;
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* static const TBuildFunctionFactory<TExampleFunction<FType>> ExampleFunctionFactory(Name, Version);
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*/
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template <typename FunctionType>
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class TBuildFunctionFactory final : public IBuildFunctionFactory
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{
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static_assert(sizeof(FunctionType) == sizeof(IBuildFunction), "Derivations of IBuildFunction must be pure and maintain no state.");
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public:
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template <typename... ArgTypes>
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explicit TBuildFunctionFactory(ArgTypes&&... Args)
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: Function(Forward<ArgTypes>(Args)...)
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{
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IModularFeatures::Get().RegisterModularFeature(FeatureName, this);
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}
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~TBuildFunctionFactory()
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{
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IModularFeatures::Get().UnregisterModularFeature(FeatureName, this);
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}
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const IBuildFunction& GetFunction() const final
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{
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return Function;
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}
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private:
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const FunctionType Function;
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};
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} // UE::DerivedData
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