How do I use in constexpr contexts std::optional in C++?

In modern C++ (C++17 and later), you can use `std::optional` in `constexpr` contexts to allow for optional values in compile-time computations. Here's how to leverage `std::optional` in `constexpr` functions.

std::optional, C++17, constexpr, compile-time, optional values, C++ optional example

This example demonstrates using std::optional in a constexpr function, enabling conditional compilation based on the presence of a value.

#include <optional> #include <iostream> constexpr std::optional safe_divide(int a, int b) { return b != 0 ? std::optional(a / b) : std::nullopt; } int main() { constexpr auto result1 = safe_divide(10, 2); constexpr auto result2 = safe_divide(10, 0); std::cout << "Result 1: " << (result1.has_value() ? std::to_string(result1.value()) : "undefined") << std::endl; std::cout << "Result 2: " << (result2.has_value() ? std::to_string(result2.value()) : "undefined") << std::endl; return 0; }

std::optional C++17 constexpr compile-time optional values C++ optional example

Related Questions

How do I avoid rehashing overhead with std::set in multithreaded code?

How do I find elements with custom comparators with std::set for embedded targets?

How do I erase elements while iterating with std::set for embedded targets?

How do I provide stable iteration order with std::unordered_map for large datasets?

How do I reserve capacity ahead of time with std::unordered_map for large datasets?

How do I erase elements while iterating with std::unordered_map in multithreaded code?

How do I provide stable iteration order with std::map for embedded targets?

How do I provide stable iteration order with std::map in multithreaded code?

How do I avoid rehashing overhead with std::map in performance-sensitive code?

How do I merge two containers efficiently with std::map for embedded targets?