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AnyFunction.hpp
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AnyFunction.hpp
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#pragma once
#include "Any.hpp"
#include "CTDArray.hpp"
#include "Type.hpp"
namespace CTC {
namespace details {
template <auto I, auto Argc>
constexpr auto any_call_base(auto& fn, CTDArray<Any>& args, auto&... pack) -> Any {
if constexpr (I < Argc) {
if constexpr (sizeof...(pack) == 0) {
return any_call_base<I + 1, Argc>(fn, args, args[I]);
} else {
return any_call_base<I + 1, Argc>(fn, args, pack..., args[I]);
}
} else {
if constexpr (sizeof...(pack) > 0) {
if constexpr (std::is_same_v<void, decltype(fn(pack...))>) {
fn(pack...);
return {};
} else {
return {fn(pack...)};
}
} else {
if constexpr (std::is_same_v<void, decltype(fn())>) {
fn();
return {};
} else {
return {fn()};
}
}
}
}
template <typename T>
constexpr auto any_call(T& fn, CTDArray<Any>& args) {
return any_call_base<0, FunctionInfo<T>::argc>(fn, args);
}
template <typename T, auto... I>
constexpr auto do_arg_types_hash(std::index_sequence<I...> indexs) {
CTDArray<std::size_t> res;
(res.push_back(hash_of<typename FunctionInfo<T>::args::template type<I>>()), ...);
return res;
}
} // namespace details
struct AnyFunction {
Any fn;
Any (*call)(Any&, CTDArray<Any>&);
CTDArray<std::size_t> argTypesHash;
constexpr AnyFunction() : fn(), call(nullptr) {}
template <typename T>
constexpr AnyFunction(const T& fn)
: fn(fn),
call([](Any& fn, CTDArray<Any>& args) -> Any { return details::any_call(fn.cast_to_ref<T>(), args); }),
argTypesHash(details::do_arg_types_hash<T>(std::make_index_sequence<CTC::FunctionInfo<T>::argc>{})) {}
constexpr Any operator()(CTDArray<Any>& args) {
if (check(args)) return call(fn, args);
std::unreachable();
}
constexpr Any operator()(const CTDArray<Any>& args) {
auto targs = args;
if (check(targs)) return call(fn, targs);
std::unreachable();
}
private:
constexpr bool check(CTDArray<Any>& args) {
if (args.size() != argTypesHash.size()) {
return false;
}
for (std::size_t i = 0; i < args.size(); i++) {
if (args[i].type_hash != argTypesHash[i] && argTypesHash[i] != hash_of<Any>()) {
return false;
}
}
return true;
}
};
} // namespace CTC