How do I use std::conditional in C++?

How do I use std::conditional in C++?

std::conditional is a type trait that allows you to select one of two types based on a boolean condition. It’s part of the <type_traits> header.

Can you give me an example of how it works?

Sure! Here's a simple example:

#include <iostream>
#include <type_traits>

int main() {
    using MyType = std::conditional<true, int, double>::type;
    MyType a = 5; // a is of type int
    std::cout << a << std::endl;
    return 0;
}

What if the condition is false?

If the condition is false, std::conditional will select the second type. For example:

using MyType = std::conditional<false, int, double>::type;
MyType b = 5.5; // b is of type double

Are there any practical use cases for this?

Yes, it's often used in template metaprogramming to create type-safe code that adapts based on conditions at compile time.