godot/modules/mono/mono_gc_handle.h

/*************************************************************************/
/*  mono_gc_handle.h                                                     */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
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/* Copyright (c) 2007-2022 Juan Linietsky, Ariel Manzur.                 */
/* Copyright (c) 2014-2022 Godot Engine contributors (cf. AUTHORS.md).   */
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#ifndef MONO_GC_HANDLE_H
#define MONO_GC_HANDLE_H

#include "core/object/ref_counted.h"

namespace gdmono {

enum class GCHandleType : char {
	NIL,
	STRONG_HANDLE,
	WEAK_HANDLE
};
}

extern "C" {
struct GCHandleIntPtr {
	void *value;

	_FORCE_INLINE_ bool operator==(const GCHandleIntPtr &p_other) { return value == p_other.value; }
	_FORCE_INLINE_ bool operator!=(const GCHandleIntPtr &p_other) { return value != p_other.value; }

	GCHandleIntPtr() = delete;
};
}

static_assert(sizeof(GCHandleIntPtr) == sizeof(void *));

// Manual release of the GC handle must be done when using this struct
struct MonoGCHandleData {
	GCHandleIntPtr handle = { nullptr };
	gdmono::GCHandleType type = gdmono::GCHandleType::NIL;

	_FORCE_INLINE_ bool is_released() const { return !handle.value; }
	_FORCE_INLINE_ bool is_weak() const { return type == gdmono::GCHandleType::WEAK_HANDLE; }
	_FORCE_INLINE_ GCHandleIntPtr get_intptr() const { return handle; }

	void release();

	static void free_gchandle(GCHandleIntPtr p_gchandle);

	void operator=(const MonoGCHandleData &p_other) {
#ifdef DEBUG_ENABLED
		CRASH_COND(!is_released());
#endif
		handle = p_other.handle;
		type = p_other.type;
	}

	MonoGCHandleData(const MonoGCHandleData &) = default;

	MonoGCHandleData() {}

	MonoGCHandleData(GCHandleIntPtr p_handle, gdmono::GCHandleType p_type) :
			handle(p_handle),
			type(p_type) {
	}
};

#endif // MONO_GC_HANDLE_H