我正在嘗試使用 android ndk 將 Box2D 編譯為 android 的 64 位版本但是我收到了很多這樣的錯誤：andEnginePhysicsBox2DExtension/src/main/jni\Box2D/Collision/Shapes/b2ChainShape.h:111:20：警告：NULL 常量隱式轉換為“bool”[-Wnull-conversion] m_hasPrevVertex = NULL; ~ ^~~~ 假的這就是我的 b2ChainShape.h 的內容/** Copyright (c) 2006-2010 Erin Catto http://www.box2d.org** This software is provided 'as-is', without any express or implied* warranty.  In no event will the authors be held liable for any damages* arising from the use of this software.* Permission is granted to anyone to use this software for any purpose,* including commercial applications, and to alter it and redistribute it* freely, subject to the following restrictions:* 1. The origin of this software must not be misrepresented; you must not* claim that you wrote the original software. If you use this software* in a product, an acknowledgment in the product documentation would be* appreciated but is not required.* 2. Altered source versions must be plainly marked as such, and must not be* misrepresented as being the original software.* 3. This notice may not be removed or altered from any source distribution.*/#ifndef B2_CHAIN_SHAPE_H#define B2_CHAIN_SHAPE_H#include <Box2D/Collision/Shapes/b2Shape.h>class b2EdgeShape;/// A chain shape is a free form sequence of line segments./// The chain has two-sided collision, so you can use inside and outside collision./// Therefore, you may use any winding order./// Since there may be many vertices, they are allocated using b2Alloc./// Connectivity information is used to create smooth collisions./// WARNING: The chain will not collide properly if there are self-intersections.