Can You Pass `auto` as an Argument to a Function in C ?

Passing Auto as Argument in C

In C , the auto keyword can be utilized as a type specifier to deduce the type of a variable or expression. However, can auto be passed as an argument to a function?

The answer in C 20 is yes. Here's an example:

int function(auto data)
{
    // Do something with the data of type deduced from its initializer
}

This code is valid because C 20 supports unconstrained auto parameters. This means that the auto argument in the function allows for any type of data to be passed, without any constraints.

In addition to unconstrained auto parameters, C 20 also introduces constrained auto parameters, which allow you to specify type constraints for the auto argument. This is achieved using concepts, a feature introduced in C 20. For example:

void function(const Sortable auto& data)
{
    // Do something that requires data to be Sortable
}

In this example, the auto argument is constrained to be of a type that implements the Sortable concept. Concepts are a way of specifying requirements that types must meet, and they provide a more expressive and flexible way of constraining types compared to traditional templates.

By utilizing auto as an argument, you can simplify and streamline your code, especially when dealing with generic functions or functions that accept a wide range of input types.

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