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Add SFINAE friendly for FindComponent

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sha512sum 2024-06-30 12:00:31 +00:00
parent 5dd7fe7903
commit b1c8927679
1 changed files with 20 additions and 16 deletions
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36
include/cserver/engine/components.hpp
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@ -133,9 +133,15 @@ struct ServiceContextForComponent {
};
template <utempl::ConstexprString Name>
constexpr auto FindComponent() -> decltype(FindComponent<kUtils.template GetIndexByName(Name)>()) {
return this->FindComponent<kUtils.template GetIndexByName(Name)>();
constexpr auto FindComponent() -> auto&
requires (Name == kBasicTaskProcessorName || requires {this->FindComponent<kUtils.template GetIndexByName(Name)>();}) {
if constexpr(Name == kBasicTaskProcessorName) {
return this->context.taskProcessor;
} else {
return this->FindComponent<kUtils.template GetIndexByName(Name)>();
};
};
template <template <typename...> typename F>
constexpr auto FindComponent() -> decltype(this->FindComponent<kUtils.template GetFirstIndex<F>()>()) {
return this->FindComponent<kUtils.template GetFirstIndex<F>()>();
@ -258,22 +264,20 @@ struct ServiceContext {
template <typename Current, std::size_t I>
constexpr auto FindComponent() -> auto& requires (I == sizeof...(Ts) || requires{*Get<I>(this->storage);}) {
constexpr auto FindComponent() -> decltype(*Get<I>(this->storage))& {
constexpr auto Index = kUtils.GetIndexByName(Current::kName);
if constexpr(I == sizeof...(Ts)) {
return this->taskProcessor;
} else {
constexpr utempl::ConstexprString name = Current::kName;
constexpr Options options = Current::kOptions;
constexpr auto dependencies = Get<Index>(DependencyGraph);
static_assert((
/* Component Type */ std::ignore = utempl::kType<typename Current::Type>,
/* Component Name */ std::ignore = name,
/* Component Options */ std::ignore = options,
dependencies.size() != 0), "Constructor is not declared as constexpr");
return *Get<I>(this->storage);
};
constexpr utempl::ConstexprString name = Current::kName;
constexpr Options options = Current::kOptions;
constexpr auto dependencies = Get<Index>(DependencyGraph);
static_assert((
/* Component Type */ std::ignore = utempl::kType<typename Current::Type>,
/* Component Name */ std::ignore = name,
/* Component Options */ std::ignore = options,
dependencies.size() != 0), "Constructor is not declared as constexpr");
return *Get<I>(this->storage);
};
};