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class ConstRef
{
public:
ConstRef(int ii);
private:
int i;
const int ci;
int &ri;
};
//ConstRef::ConstRef(int ii)
//{
// i = ii; // ok
// ci = ii; // error:cannot assign to a const
// ri = ii; // error:ri was never initialized
//}
// ok:explicitly initialize reference and const members
ConstRef::ConstRef(int ii) :i(ii), ci(ii), ri(ii){};
只能通过构造函数的初始化列表来为const, reference or of a class type that does not have a default-constructor进行初始化。
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原文地址：http://my.oschina.net/hejunsen/blog/511401
