How Can I Correctly Invoke a Member Function Pointer in C ?

Member Function Pointer Invocation

When working with member function pointers, executing the function through the pointer often proves challenging. Let's consider this issue in greater detail.

In the provided code snippet, an attempt is made to invoke the walk member function of the cat class through the member function pointer pcat. However, the code fails to compile due to incorrect syntax.

The root of the problem lies in the precedence of operators. The function call operator (()) has higher precedence than the pointer-to-member binding operator (.*). Moreover, unary operators take precedence over binary operators. To resolve this issue, additional parentheses are required, as shown below:

(bigCat.*pcat)();
^            ^

By enclosing the function call in parentheses, we ensure that it is executed first, followed by the binding of the member function pointer pcat to the cat object bigCat. This adjustment allows for the successful invocation of the walk member function.

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