std::vector class with functions?

[lawl_rock]

I have a typedef std::vector that I'd like to expand to have a function that will seek members with a specific value in a variable. I currently have something like

class MyClass {
     public:
     int a;
};

typedef std::vector<MyClass> MyClassArr;

How could I have the MyClassArr type have additional functions?
Thank you in advance.

EDIT:
I believe I figured it out.

class MyClass {
     public:
     int a;
};

class MyClassArr:public std::vector<MyClass> {
     void func();
};