Test a c++ class has member function

has_member.cpp

#include <iostream>
#include <string>
#include <type_traits>

// Primary template with a static assertion
// for a meaningful error message
// if it ever gets instantiated.
// We could leave it undefined if we didn't care.

#define DEFINE_HAS_METHOD(TraitsName, MethodName) \
template<typename, typename T> \
struct TraitsName { \
    static_assert( \
        std::integral_constant<T, false>::value, \
        "Second template parameter needs to be of function type."); \
}; \
 \
template<typename C, typename Ret, typename... Args> \
struct TraitsName<C, Ret(Args...)> { \
private: \
    template<typename T> \
    static constexpr auto check(T*) \
    -> typename \
        std::is_same< \
            decltype( std::declval<T>().MethodName( std::declval<Args>()... ) ), \
            Ret \
        >::type; \
 \
    template<typename> \
    static constexpr std::false_type check(...); \
 \
    typedef decltype(check<C>(0)) type; \
 \
public: \
    static constexpr bool value = type::value; \
}

DEFINE_HAS_METHOD(has_serialize, serialize);
DEFINE_HAS_METHOD(has_clear, clear);

struct X {
     int serialize(const std::string&) { return 42; } 
     void clear() { } 
};

struct Y : X {};

int main() {
    std::cout << has_serialize<Y, int(const std::string&)>::value; // will print 1
    std::cout << has_clear<Y, void()>::value; // will print 1
}

Ref:
https://stackoverflow.com/questions/87372/check-if-a-class-has-a-member-function-of-a-given-signature