id.h

// SPDX-FileCopyrightText: 2023 Erin Catto
// SPDX-License-Identifier: MIT
 
#pragma once
 
#include "box2d/base.h"
 
#include <stdint.h>
 
typedef struct b2WorldId
{
    uint16_t index1;
    uint16_t revision;
} b2WorldId;
 
typedef struct b2BodyId
{
    int32_t index1;
    uint16_t world0;
    uint16_t revision;
} b2BodyId;
 
typedef struct b2ShapeId
{
    int32_t index1;
    uint16_t world0;
    uint16_t revision;
} b2ShapeId;
 
typedef struct b2JointId
{
    int32_t index1;
    uint16_t world0;
    uint16_t revision;
} b2JointId;
 
typedef struct b2ChainId
{
    int32_t index1;
    uint16_t world0;
    uint16_t revision;
} b2ChainId;
 
static const b2WorldId b2_nullWorldId = B2_ZERO_INIT;
static const b2BodyId b2_nullBodyId = B2_ZERO_INIT;
static const b2ShapeId b2_nullShapeId = B2_ZERO_INIT;
static const b2JointId b2_nullJointId = B2_ZERO_INIT;
static const b2ChainId b2_nullChainId = B2_ZERO_INIT;
 
#define B2_IS_NULL(id) (id.index1 == 0)
 
#define B2_IS_NON_NULL(id) (id.index1 != 0)
 
#define B2_ID_EQUALS(id1, id2) (id1.index1 == id2.index1 && id1.world0 == id2.world0 && id1.revision == id2.revision)