How to Alias Functions in C 11 Using Perfect Forwarding?

C 11 Alias Functions

In C , classes and types can be aliased using the using keyword. However, aliasing functions directly is not supported. This question investigates a method to alias a function, f, defined in the bar namespace.

Aliasing with Perfect Forwarding

The answer suggests using perfect forwarding to create a function alias. Perfect forwarding is a technique that allows arguments to be passed to a function with the same type as when they were called. Using a function template with perfect forwarding, an alias can be defined as follows:

<code class="cpp">template <typename... Args>
auto g(Args&&... args) -> decltype(f(std::forward<Args>(args)...)) {
  return f(std::forward<Args>(args)...);
}</code>

For example, to alias bar::f as g:

<code class="cpp">namespace bar {
    void f();
}

g(args...);  // Calls bar::f with the same arguments</code>

Advantages and Applicability

This solution applies even if f is overloaded or a function template. It encapsulates the perfect forwarding logic, simplifying its usage. However, it should be noted that the alias g cannot be used as a function pointer directly.

Conclusion

By utilizing perfect forwarding, it is possible to create function aliases in C 11, providing a convenient way to rename functions and improve code readability.

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