c++ - C++中异常属于线程还是进程？

Question

假设我们有两个正在运行的线程，它们都会抛出异常，并且这些线程中有异常处理程序。 C++ 是否能够处理这个问题，而不是遇到终止或未定义的行为。

异常属于每个线程，并且每个线程一次只能有一个异常是否正确？

Answer 1

Is it correct that exception belongs to per thread

没错。

and each thread can have no more than one exception at a time?

一个线程可以有多个事件异常。参见 int uncaught_exceptions() noexcept :

Detects how many exceptions in the current thread have been thrown or rethrown and not yet entered their matching catch clauses.

例如:

#include <iostream>
#include <stdexcept>

void f() {
    throw std::runtime_error("error");
}

struct A {
    ~A() {
        std::cout << "uncaught_exceptions: " << std::uncaught_exceptions() << '\n';
    }
};

struct B {
    ~B() {
        try {
            A a;
            f();
        }
        catch(std::exception&) {}
    }
};

int main() {
    try {
        B b;
        f();
    }
    catch(std::exception&) {}
}

输出:

uncaught_exceptions: 2