The Base Class Catches the Derived

1#include <iostream>
2#include <stdexcept>
3#include <string>
4 
5void load(const std::string& file) {
6    if (file.empty()) {
7        throw std::invalid_argument("empty file name");
8    }
9    if (file == "old.dat") {
10        throw std::runtime_error("file is corrupt: " + file);
11    }
12    std::cout << "loaded " << file << "\n";
13}
14 
15int main() {
16    std::string files[] = {"a.dat", "", "old.dat"};
17    for (const std::string& file : files) {
18        try {
19            load(file);
20        } catch (const std::exception& e) {
21            std::cout << "problem: " << e.what() << "\n";
22        }
23    }
24    return 0;
25}