What are user-defined literals in C++11?

What are user-defined literals in C++11?

User-defined literals allow you to create custom literal types in C++. They enable you to define how literals like integers or strings are interpreted.

Can you give me an example of how to create a user-defined literal?

Sure! For example, you can define a user-defined literal for meters like this:

constexpr long double operator" _m"(long double val) {
    return val;
}

Now you can use 5.0_m to represent 5 meters.

What are the benefits of using user-defined literals?

They improve code readability and allow for type safety by enabling you to create more expressive and meaningful representations of data.

Are there any limitations to user-defined literals?

Yes, user-defined literals can only be defined for certain types, and they must follow specific naming conventions. Also, they can make the code harder to understand if overused.