c++ - catch block 让我无法匹配运算符(operator)错误

Question

我正在 try catch 如下所示的异常 -

try {

} catch (const std::exception& ex) {
    cout << "An exception occurred when executing query. " << ex << endl;
}

但每次我都会收到这个错误 -

no match for operator<< in std::operator<< <std::char_traits<char> >((* & std::cout), ((const char*)"An exception occurred when executing query. ")) << ex

知道我在这里做错了什么吗？

Answer 1

使用这个

cout << "An exception occurred when executing query. " << ex.what() << endl;

<< exception 中的运算符未重载类。