Can You Pass \'auto\' as a Function Argument in C ?

Passing "auto" as a Function Argument in C

In C , it is currently possible to pass "auto" as an argument to a function in C 20.

Using C 20, you can define a function with an "auto" parameter type as follows:

int function(auto data)
{
    // Operations...
}

This code is legal and signifies that the "function" is an abbreviated function template. There are no constraints on the data type that can be passed to the function using this parameter.

However, in C 20, you can also use a constrained auto parameter using concepts. For example, you could define a function that requires its parameter to be "Sortable":

void function(const Sortable auto& data)
{
    // Operations that require data to be Sortable
}

This technique allows for more type safety and expressive function signatures. It is important to note that unconstrained auto parameters are not allowed in function templates.

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