从'const b2Shape *'动态投射到'b2PolygonShape *'会抛弃限定符？

Question

我只是尝试从b2PolygonShape创建b2Shape，但我收到的错误是：Dynamic-cast from 'const b2Shape*' to 'b2PolygonShape*' casts away qualifiers

这是我的代码：

const b2Shape *s = fix2.shape;
b2PolygonShape *p = dynamic_cast<b2PolygonShape*>(s);

我做错了什么？

Answer 1

编译器抱怨的是const限定符。解决方案是 将p声明为const b2PolygonShape的指针：

const b2PolygonShape *p = dynamic_cast<const b2PolygonShape*>(s);