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40 lines
1.2 KiB
C++
40 lines
1.2 KiB
C++
#pragma once
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#include <compare>
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#include <type_traits>
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#include <utility>
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namespace rx {
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template <typename> class FunctionRef;
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template <typename RT, typename... ArgsT> class FunctionRef<RT(ArgsT...)> {
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void *context = nullptr;
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RT (*invoke)(void *, ArgsT...) = nullptr;
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public:
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constexpr FunctionRef() = default;
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template <typename T>
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requires(!std::is_same_v<std::remove_cvref_t<T>, FunctionRef>)
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constexpr FunctionRef(T &&object)
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requires requires(ArgsT... args) { RT(object(args...)); }
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: context(
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const_cast<std::remove_const_t<std::remove_cvref_t<T>> *>(&object)),
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invoke(+[](void *context, ArgsT... args) -> RT {
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return (*reinterpret_cast<T *>(context))(std::move(args)...);
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}) {}
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template <typename... InvokeArgsT>
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constexpr RT operator()(InvokeArgsT &&...args) const
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requires requires(void *context) {
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invoke(context, std::forward<InvokeArgsT>(args)...);
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}
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{
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return invoke(context, std::forward<InvokeArgsT>(args)...);
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}
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constexpr explicit operator bool() const { return invoke != nullptr; }
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constexpr bool operator==(std::nullptr_t) const { return invoke == nullptr; }
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constexpr auto operator<=>(const FunctionRef &) const = default;
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};
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} // namespace rx
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