c++ - 关于抛出异常的一些问题

Question

cpp primer5的ch18.11的问题：为什么异常类的what函数不应该抛出异常？

想问一下：

抛出异常时为了程序能处理无法预料的情况，那么what只是输出字符串，所以不会触发异常..对不？

Answer 1

This is a question of API design. The what function is usually called in the catch statement.
try/catch originally has the function of adding insurance.
If an exception is thrown in what, try/ What’s the use of catch?
Does every catch need to be preceded by a try/catch?
Isn’t this a scam?