ios - 从 'const b2Shape*' 到 'b2PolygonShape*' 的动态转换会抛弃限定符？

Question

我只是想b2PolygonShape从 a创建一个，b2Shape但我遇到一个错误，上面写着：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);

我究竟做错了什么？

Answer 1

这是const编译器抱怨的限定符。解决方案是声明p为指向的指针const b2PolygonShape：

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