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C++ Quiz #132

Why Catch by const Reference

easyExceptions

The handler is written as catch (const std::exception& e). Why a const reference rather than catch (std::exception e)?

📄 Code

1#include <iostream>
2#include <stdexcept>
3 
4void load(int size) {
5    if (size <= 0) {
6        throw std::runtime_error("size must be positive");
7    }
8    std::cout << "loaded " << size << "\n";
9}
10 
11int main() {
12    try {
13        load(3);
14        load(0);
15    } catch (const std::exception& e) {
16        std::cout << "caught: " << e.what() << "\n";
17    }
18    return 0;
19}