小编use*_*213的帖子

为什么以下不能处理被重新抛出的异常？我尝试了所有的组合,但没有一个会在最后一次捕获中显示输出,所以我很困惑!

Derived D;

try {
       throw D;
} catch ( const Derived &d) {
       throw;
} catch (const Base &b) {
      cout << "caught!" << endl;
}

Derived D;

try {
    throw D;
} catch ( const Derived d) {
    throw;
} catch (const Base b) {
    cout << "caught!" << endl;
}

Derived D;

try {
    throw D;
} catch ( const Derived d) {
    throw;
} catch (const Base &b) {
    cout << "caught!" << endl;
}

Derived …