How Can I Rename a Function in C ?

Renaming Functions in C

Assigning a new name to a function is not as straightforward as it is for types, variables, or namespaces. However, there are several approaches available:

1. Macros:

The simplest method is to use a macro definition. For example, #define holler printf. This creates a symbol alias, but it's a preprocessor directive and not a true function alias.

2. Function Pointers and References:

Function pointers and references can refer to an existing function. For instance, void (*p)() = fn; creates a pointer that points to fn, and void (&&r)() = fn; creates a reference to fn.

3. Inline Function Wrappers:

Inline function wrappers are another option. You can define a new function that simply calls the original function. For example, inline void g(){ f(); }.

4. Alias Templates (C 11 and Later):

With C 11, you can use alias templates for non-template, non-overloaded functions:

const auto& new_fn_name = old_fn_name;

For overloaded functions, use a static cast:

const auto&amp; new_fn_name = static_cast<OVERLOADED_FN_TYPE>(old_fn_name);

5. Constexpr Template Variables (C 14 and Later):

C 14 introduced constexpr template variables, which enable aliasing of templated functions:

template<typename T>
constexpr void old_function(/* args */);

template<typename T>
constexpr auto alias_to_old = old_function<T>;

6. std::mem_fn (C 11 and Later):

For member functions, you can use the std::mem_fn function to create an alias:

auto greet = std::mem_fn(&A::f);

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