member function pointer in constructor

I tried to use std::shared_pointer with deleter. I tried to use a member function as the deleter. However it could not compiled. Compiler gave me a error message but I could not understand why it did not work. Does someone knows why it did not work? Thank you very much.

Simplified code is following,

#include <memory>

class MemberFunctionPointerInConstructor {
public:
    MemberFunctionPointerInConstructor(void) {
        std::shared_ptr<int> a = std::shared_ptr<int>(new int(1), deleter);  // this line makes a compiler error message
    }

    void deleter(int* value) {
        delete value;
    }
};

The error message from compiler is following,

error: invalid use of non-static member function
std::shared_ptr<int> a = std::shared_ptr<int>(new int(1), deleter);
                                                                 ^

Thank you very much.