Error Handling

Prefer using exceptions to signal an error, but not error code. Pair it with RAII (Resource Acquisition is Initialization) is ideal.

Since throwing exceptions will cause the stack to be unwind, and it will be propagated to the one with a try catch block. While error code must be handled at each function along the call stack.

#include <iostream>
#include <stdexcept>
 
void level3() {
    throw std::runtime_error("Error at level 3");
}
 
void level2() {
    level3();
}
 
void level1() {
    level2();
}
 
int main() {
    try {
        level1();
    } catch (const std::exception& e) {
        std::cout << "Caught exception: " << e.what() << std::endl;
        std::cout << "This error originated in level3(), but was caught here in main()" << std::endl;
    }
    return 0;
}