In this challenge, your task is to implement a function that is **guaranteed not to throw exceptions**. Specifically, you need to write a function named `add` that takes two integers as arguments, returns their sum, and is explicitly declared as `noexcept`.

This declaration tells the compiler and other programmers that `add` will not throw any exceptions under any circumstances. Functions like this are useful in **performance-critical code** or when you want to ensure **exception safety** in larger programs.


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


int add(int a, int b) noexcept;

TEST_CASE("add returns correct sum for positive numbers", "[add]") {
    REQUIRE(add(2, 3) == 5);
}

TEST_CASE("add returns correct sum for negative numbers", "[add]") {
    REQUIRE(add(-5, -3) == -8);
}

TEST_CASE("add returns correct sum for mixed sign numbers", "[add]") {
    REQUIRE(add(-5, 5) == 0);
}

TEST_CASE("add returns correct sum for large numbers", "[add]") {
    REQUIRE(add(100000, 200000) == 300000);
}

TEST_CASE("add is noexcept", "[add]") {
    // This test will fail to compile if add is not noexcept
    static_assert(noexcept(add(1, 2)), "add must be noexcept");
    REQUIRE(true);
}

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: Noexcept Function

Lösning

Awesome!

Challenge: Noexcept Function

Lösning