C++ noexcept关键字——声明无异常，实际有异常，将会导致程序终止运行

举例：

#include
using namespace std;

class MyException
{
public:
	int a;
	MyException(int a);
	virtual void SayHello(int a) noexcept {}
};


MyException::MyException(int a)
{
	this->a = a;
}

int func(int x) noexcept
{
	if (x == 0)
	{
		return 0;
	}
	else if (x == 1)
	{
		throw "helloworld";
	}
	else if (x == 2)
	{
		throw new MyException(2);
	}
}

int main()
{
	try
	{
		func(2);
	}
	catch (int a)
	{
		cout << a << endl;
	}
	catch (char* str)
	{
		cout << str << endl;
	}
	catch (MyException* p)
	{
		cout << p->a << endl;
	}
	getchar();
	return 0;
}

func函数声明了无异常，noexcept，但是最后调用的时候func(2)之后，实际抛出了异常。此时程序终止在这里：throw new MyException(2);

验证了：

https://www.jianshu.com/p/08a53d8c9670