Can SFINAE Be Used to Detect Inherited Member Functions in C ?

SFINAE for Detecting Base Class Member Functions

In C , SFINAE (Substitution Failure Is Not An Error) is commonly used to check for the presence of a specific member function in a class. However, detecting inherited member functions using SFINAE requires a more intricate approach.

The code provided in the question attempts to leverage SFINAE for this purpose but fails to account for inheritance. To address this limitation, the solution presented here employs a different strategy.

Inspired by the discussion in a Boost users' thread, the has_foo template class is defined. It exploits a type-checking mechanism to differentiate between direct and inherited member functions. The deduce function attempts to deduce a type that matches the expected member function signature. If the deduction succeeds (i.e., the deduced type's size is yes), the result flag is set to true, indicating the presence of the inherited member function.

Applying this solution to the example classes, A, B, and C, the results demonstrate that has_foo correctly recognizes inherited member functions in B.

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