What's happening in this program? Is it crashing or is it throwing an error? [Code in description]

Question

#include <iostream>

class A {
public:
A() {}
~A() {
throw 42;
}
};

int main(int argc, const char * argv[]) {
try {
A a;
throw 32;
}
catch(int a) {
std::cout << a;
}
}

What's difference between crashing and error?

Answer 1

I tried your code and saw the error message mentioned something about C++11 destructor defaults to 'noexcept'. I'm guessing that means destructor by default shouldn't throw exception (cmiiw in case of wrong interpretation)

http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2010/n3166.html

Answer 2

a crash often result from an error (most likely logical one)
an error not systematically induce a crash (syntax and predictible errors are catched and program kindly stop at worst case, with error message if catched error not handled)