How Can I Create Function Aliases in C ?

Assigning Aliases to Function Names in C

In C , functions, like other entities like variables or types, can be assigned alternative names known as aliases. This provides a convenient and readable way to reference functions with descriptive or concise names. There are several techniques available to achieve this:

1. Using Preprocessor Macros:

#define holler printf

This approach is straightforward and simple to use. However, it can create maintainability issues as it introduces preprocessor directives into the code.

2. Using Function Pointers:

void (*p)() = fn;

Function pointers allow us to assign a new name to a function through indirection. The pointer p points to the original function fn.

3. Using Function References:

void (&r)() = fn;

Similar to function pointers, function references provide an alias through a reference. The reference r is bound to the original function fn.

4. Inline Functions:

inline void g(){ f(); }

Inline functions can be used to create a named wrapper around an existing function. The inline function g() calls the function f().

5. Using C 11 Non-Overloaded Functions:

const auto& new_fn_name = old_fn_name;

This method is available in C 11 for non-template, non-overloaded functions. The alias new_fn_name refers to the original function old_fn_name.

6. Using C 11 Static Cast for Overloaded Functions:

const auto& new_fn_name = static_cast<overloaded_fn_type>(old_fn_name);</overloaded_fn_type>

For overloaded function, a static cast is used to specify the specific overload to alias. OVERLOADED_FN_TYPE represents the type of the specific overloaded function.

7. Using C 14 Constexpr Template Variables:

template<typename t>
constexpr auto alias_to_old = old_function<t>;</t></typename>

This approach allows aliasing templated functions using constexpr template variables. The alias alias_to_old refers to the templated function old_function.

8. Using std::mem_fn:

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

std::mem_fn in C 11 allows aliasing of member functions. The alias greet refers to the member function A::f.

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