从'const b2Shape*‘到'b2PolygonShape*’的动态转换会丢弃限定符吗？

Question

我只是简单地尝试从b2Shape创建一个b2PolygonShape，但我遇到了一个错误，显示为：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声明为指向const b2PolygonShape指针

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