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C++ Quiz #142

throw e Versus a Bare throw

mediumExceptions

Both functions catch a DerivedError through a const BaseError&. One rethrows with throw e;, the other with a bare throw;. What is printed?

📄 Code

1#include <iostream>
2#include <exception>
3 
4class BaseError : public std::exception {
5public:
6    const char* what() const noexcept override { return "base"; }
7};
8 
9class DerivedError : public BaseError {
10public:
11    const char* what() const noexcept override { return "derived"; }
12};
13 
14void copyRethrow() {
15    try {
16        throw DerivedError();
17    } catch (const BaseError& e) {
18        throw e;
19    }
20}
21 
22void bareRethrow() {
23    try {
24        throw DerivedError();
25    } catch (const BaseError&) {
26        throw;
27    }
28}
29 
30int main() {
31    try {
32        copyRethrow();
33    } catch (const BaseError& e) {
34        std::cout << "copy: " << e.what() << "\n";
35    }
36    try {
37        bareRethrow();
38    } catch (const BaseError& e) {
39        std::cout << "bare: " << e.what() << "\n";
40    }
41    return 0;
42}