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74 lines
2.7 KiB
74 lines
2.7 KiB
4 months ago
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/*
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* Copyright 2014 Google Inc. All rights reserved.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef FRUIT_COMPONENT_FUNCTION_H
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#define FRUIT_COMPONENT_FUNCTION_H
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#include <fruit/impl/fruit_internal_forward_decls.h>
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namespace fruit {
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/**
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* See fruit::componentFunction() helper for how to construct a ComponentFunction, and see
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* PartialComponent::installComponentFunctions() for more information on using ComponentFunction objects.
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*/
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template <typename ComponentType, typename... ComponentFunctionArgs>
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class ComponentFunction {
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private:
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ComponentType (*getComponent)(ComponentFunctionArgs...);
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std::tuple<ComponentFunctionArgs...> args_tuple;
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/**
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* This is (intentionally) private, use fruit::componentFunction() to construct ComponentFunction objects.
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*/
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explicit ComponentFunction(ComponentType (*getComponent)(ComponentFunctionArgs...), ComponentFunctionArgs... args);
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friend struct fruit::impl::ComponentStorageEntry;
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public:
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// Prefer using the simpler componentFunction() below instead of this.
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template <typename... ActualArgs>
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static ComponentFunction<ComponentType, ComponentFunctionArgs...> create(
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ComponentType (*getComponent)(ComponentFunctionArgs...), ActualArgs&&... args);
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ComponentFunction(const ComponentFunction&) = default;
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ComponentFunction(ComponentFunction&&) noexcept = default;
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ComponentFunction& operator=(const ComponentFunction&) = default;
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ComponentFunction& operator=(ComponentFunction&& other) noexcept {
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args_tuple = std::move(other.args_tuple);
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return *this;
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}
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ComponentType operator()();
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};
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/**
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* This function allows to easily construct a ComponentFunction without explicitly mentioning its type.
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* See PartialComponent::installComponentFunctions() for more information on using ComponentFunction.
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*/
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template <typename... ComponentParams, typename... FormalArgs, typename... ActualArgs>
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ComponentFunction<fruit::Component<ComponentParams...>, FormalArgs...> componentFunction(
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fruit::Component<ComponentParams...> (*getComponent)(FormalArgs...),
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ActualArgs&&... args);
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}
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#include <fruit/impl/component_function.defn.h>
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#endif // FRUIT_COMPONENT_FUNCTION_H
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