godot-cpp/include/godot_cpp/core/builtin_ptrcall.hpp

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/*  builtin_ptrcall.hpp                                                   */
/**************************************************************************/
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/* Copyright (c) 2007-2014 Juan Linietsky, Ariel Manzur.                  */
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#pragma once

#include <gdextension_interface.h>
#include <godot_cpp/core/object.hpp>

#include <array>

namespace godot {

namespace internal {

template <typename O, typename... Args>
O *_call_builtin_method_ptr_ret_obj(const GDExtensionPtrBuiltInMethod method, GDExtensionTypePtr base, const Args &...args) {
	GodotObject *ret = nullptr;
	std::array<GDExtensionConstTypePtr, sizeof...(Args)> call_args = { { (GDExtensionConstTypePtr)args... } };
	method(base, call_args.data(), &ret, sizeof...(Args));
	if (ret == nullptr) {
		return nullptr;
	}
	return reinterpret_cast<O *>(internal::get_object_instance_binding(ret));
}

template <typename... Args>
void _call_builtin_constructor(const GDExtensionPtrConstructor constructor, GDExtensionTypePtr base, Args... args) {
	std::array<GDExtensionConstTypePtr, sizeof...(Args)> call_args = { { (GDExtensionConstTypePtr)args... } };
	constructor(base, call_args.data());
}

template <typename T, typename... Args>
T _call_builtin_method_ptr_ret(const GDExtensionPtrBuiltInMethod method, GDExtensionTypePtr base, Args... args) {
	T ret;
	std::array<GDExtensionConstTypePtr, sizeof...(Args)> call_args = { { (GDExtensionConstTypePtr)args... } };
	method(base, call_args.data(), &ret, sizeof...(Args));
	return ret;
}

template <typename... Args>
void _call_builtin_method_ptr_no_ret(const GDExtensionPtrBuiltInMethod method, GDExtensionTypePtr base, Args... args) {
	std::array<GDExtensionConstTypePtr, sizeof...(Args)> call_args = { { (GDExtensionConstTypePtr)args... } };
	method(base, call_args.data(), nullptr, sizeof...(Args));
}

template <typename T>
T _call_builtin_operator_ptr(const GDExtensionPtrOperatorEvaluator op, GDExtensionConstTypePtr left, GDExtensionConstTypePtr right) {
	T ret;
	op(left, right, &ret);
	return ret;
}

template <typename T>
T _call_builtin_ptr_getter(const GDExtensionPtrGetter getter, GDExtensionConstTypePtr base) {
	T ret;
	getter(base, &ret);
	return ret;
}

} // namespace internal

} // namespace godot