Destructors Run on the Way Out

1#include <iostream>
2#include <stdexcept>
3#include <string>
4 
5class Guard {
6    std::string m_name;
7public:
8    explicit Guard(const std::string& name) : m_name(name) {
9        std::cout << "open " << m_name << "\n";
10    }
11    ~Guard() {
12        std::cout << "close " << m_name << "\n";
13    }
14};
15 
16void inner() {
17    Guard g("inner");
18    std::cout << "inner working\n";
19    throw std::runtime_error("inner failed");
20    std::cout << "inner done\n";
21}
22 
23void outer() {
24    Guard g("outer");
25    inner();
26    std::cout << "outer done\n";
27}
28 
29int main() {
30    try {
31        outer();
32    } catch (const std::runtime_error& e) {
33        std::cout << "caught: " << e.what() << "\n";
34    }
35    return 0;
36}