How do I use in constexpr contexts std::expected (when available) in C++?

C++17 introduced the possibility to use compile-time expressions and `constexpr` functions, which allows for improved performance and safety. `std::expected`, available in C++23, provides a mechanism to handle potential errors in a more elegant way than traditional error handling approaches. This article explains how to use `std::expected` in `constexpr` contexts effectively.
C++, std::expected, constexpr, error handling, C++23, compile-time expressions
#include <expected> #include <iostream> constexpr std::expected divide(int numerator, int denominator) { if (denominator == 0) { return std::unexpected("Division by zero"); } return numerator / denominator; } constexpr void testExpected() { constexpr auto result = divide(10, 2); if (result) { std::cout << "Result: " << *result << std::endl; } else { std::cout << "Error: " << result.error() << std::endl; } } int main() { testExpected(); return 0; }

C++ std::expected constexpr error handling C++23 compile-time expressions

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