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

/*************************************************************************/
/*  defs.hpp                                                             */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
/*                      https://godotengine.org                          */
/*************************************************************************/
/* Copyright (c) 2007-2022 Juan Linietsky, Ariel Manzur.                 */
/* Copyright (c) 2014-2022 Godot Engine contributors (cf. AUTHORS.md).   */
/*                                                                       */
/* Permission is hereby granted, free of charge, to any person obtaining */
/* a copy of this software and associated documentation files (the       */
/* "Software"), to deal in the Software without restriction, including   */
/* without limitation the rights to use, copy, modify, merge, publish,   */
/* distribute, sublicense, and/or sell copies of the Software, and to    */
/* permit persons to whom the Software is furnished to do so, subject to */
/* the following conditions:                                             */
/*                                                                       */
/* The above copyright notice and this permission notice shall be        */
/* included in all copies or substantial portions of the Software.       */
/*                                                                       */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
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/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
/*************************************************************************/

#ifndef DEFS_H
#define DEFS_H

#include <cstddef>
#include <cstdint>
#include <cstring>

#if !defined(GDN_EXPORT)
#if defined(_WIN32)
#define GDN_EXPORT __declspec(dllexport)
#elif defined(__GNUC__)
#define GDN_EXPORT __attribute__((visibility("default")))
#else
#define GDN_EXPORT
#endif
#endif

// Turn argument to string constant:
// https://gcc.gnu.org/onlinedocs/cpp/Stringizing.html#Stringizing
#ifndef _STR
#define _STR(m_x) #m_x
#define _MKSTR(m_x) _STR(m_x)
#endif

// Should always inline no matter what.
#ifndef _ALWAYS_INLINE_
#if defined(__GNUC__)
#define _ALWAYS_INLINE_ __attribute__((always_inline)) inline
#elif defined(_MSC_VER)
#define _ALWAYS_INLINE_ __forceinline
#else
#define _ALWAYS_INLINE_ inline
#endif
#endif

// Should always inline, except in debug builds because it makes debugging harder.
#ifndef _FORCE_INLINE_
#ifdef DISABLE_FORCED_INLINE
#define _FORCE_INLINE_ inline
#else
#define _FORCE_INLINE_ _ALWAYS_INLINE_
#endif
#endif

#ifndef _NO_DISCARD_
#define _NO_DISCARD_ [[nodiscard]]
#endif

// Windows badly defines a lot of stuff we'll never use. Undefine it.
#ifdef _WIN32
#undef min // override standard definition
#undef max // override standard definition
#undef ERROR // override (really stupid) wingdi.h standard definition
#undef DELETE // override (another really stupid) winnt.h standard definition
#undef MessageBox // override winuser.h standard definition
#undef MIN // override standard definition
#undef MAX // override standard definition
#undef CLAMP // override standard definition
#undef Error
#undef OK
#undef CONNECT_DEFERRED // override from Windows SDK, clashes with Object enum
#endif

#if defined(__GNUC__)
#define likely(x) __builtin_expect(!!(x), 1)
#define unlikely(x) __builtin_expect(!!(x), 0)
#else
#define likely(x) x
#define unlikely(x) x
#endif

#ifdef REAL_T_IS_DOUBLE
typedef double real_t;
#else
typedef float real_t;
#endif

// Generic swap template.
#ifndef SWAP
#define SWAP(m_x, m_y) __swap_tmpl((m_x), (m_y))
template <class T>
inline void __swap_tmpl(T &x, T &y) {
	T aux = x;
	x = y;
	y = aux;
}
#endif // SWAP

// Home-made index sequence trick, so it can be used everywhere without the costly include of std::tuple.
// https://stackoverflow.com/questions/15014096/c-index-of-type-during-variadic-template-expansion
template <size_t... Is>
struct IndexSequence {};

template <size_t N, size_t... Is>
struct BuildIndexSequence : BuildIndexSequence<N - 1, N - 1, Is...> {};

template <size_t... Is>
struct BuildIndexSequence<0, Is...> : IndexSequence<Is...> {};

#endif // ! DEFS_H