Method pointers help

class A {
public:
    float method1(float a) { does something with a}
};

class B {
public:
    float method2(float a) { does something with a}
    float anothermethod2(float a) { does something with a}
};

class B {
public:
    float method3(float a) { does something with a}
};

int main()
{
    std::vector< (what do i put in here?)> MethodsToCall;

    MethodsToCall.pushback(  A::method1 );
    MethodsToCall.pushback(  B::method2 );
    MethodsToCall.pushback(  C::method3 );
    MethodsToCall.pushback(  B::anothermethod2 );

    for(F : MethodsToCall )
    {
        std::cout << F(3.5) << std::endl;
    }
    return 0;
}