Using C 11 to Determine Member Function Presence with a Specific Signature
In C , developers often encounter the need to verify whether a class possesses a member function with a specific signature. While not addressed directly in the referenced documentation, this article presents a template-based solution that satisfies this requirement.
The proposed technique relies on C 11 features, ensuring its accuracy even for inherited functions. The method revolves around a test for the existence of a function named "serialize."
Template Specialization for Function Detection
The core of the solution lies in the specialization of a template named "has_serialize." This template's parameters are a class and a function signature represented as "Ret(Args...)". The specialization attempts to call the "serialize" function on an instance of the class and checks if the return type matches the provided signature.
If the function exists and its return type aligns with the specified signature, the "has_serialize" template specialization returns true. Otherwise, it returns false.
Usage Example
To illustrate the usage of this solution, consider the following code:
struct X {
int serialize(const std::string&);
};
struct Y : X {};
std::cout << has_serialize<Y, int(const std::string&)>::value; // will print 1
In this example, the "has_serialize" template is used to determine if the "Y" class possesses a "serialize" function that takes a string as an argument and returns an integer. Since "Y" inherits this function from "X," the result is true, resulting in the output of 1.
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