In this challenge, you will practice using **exception handling** to make array access safer. Your goal is to write a function that retrieves an element from a given array, but if the requested index is out of bounds, the function should throw an exception. This approach helps prevent undefined behavior and allows your code to handle errors gracefully.


#define CATCH_CONFIG_MAIN
#include <catch2/catch.hpp>


#include <vector>
#include <stdexcept>

int getElement(const std::vector<int>& arr, size_t index);

TEST_CASE("Valid index returns the correct element", "[getElement]") {
    std::vector<int> arr = {10, 20, 30, 40};
    REQUIRE(getElement(arr, 0) == 10);
    REQUIRE(getElement(arr, 3) == 40);
}

TEST_CASE("Index equal to size throws std::out_of_range", "[getElement]") {
    std::vector<int> arr = {5, 15};
    REQUIRE_THROWS_AS(getElement(arr, 2), std::out_of_range);
}

TEST_CASE("Index greater than size throws std::out_of_range", "[getElement]") {
    std::vector<int> arr = {1, 2, 3};
    REQUIRE_THROWS_AS(getElement(arr, 5), std::out_of_range);
}

TEST_CASE("Exception message is clear", "[getElement]") {
    std::vector<int> arr = {1};
    try {
        getElement(arr, 3);
        REQUIRE(false); // Should not reach here
    } catch (const std::out_of_range& e) {
        REQUIRE(std::string(e.what()) == "Index is out of bounds");
    }
}

test.cpp

A practical course on mastering exception handling in modern C++. Learn how to write robust code by detecting, throwing, and managing errors using exceptions. Each section introduces a new aspect of exception handling, followed by hands-on challenges inspired by real-world scenarios.

Understand the basics of exception handling in C++. Learn about try-catch blocks, throw statements, and the standard exception hierarchy.

Learn how to define and use your own exception classes for more descriptive error handling.

Discover how to write exception-safe code and manage resources properly using RAII.

Explore advanced techniques such as exception propagation, rethrowing, and exception specifications.

Challenge: Array Access Guard

解答