Class method pointer

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()
{
    A  a1;
    B  b,b2;
    C  c;

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

    // put specific object's methods into the vector
    MethodsToCall.pushback(  a1::method1 );
    MethodsToCall.pushback(  b::method2 );
    MethodsToCall.pushback(  c::method3 );
    MethodsToCall.pushback(  b2::anothermethod2 );

    // call all the object's methods.
    for(F : MethodsToCall )
    {
        std::cout << F(3.5) << std::endl;
    }
    return 0;
}