c++ - Use of const pointer to class in function -

i using std::shared_ptr liberally in code. have few functions want call myclass using "this" have declared these functions (for example)

int anotherclass::foo(const myclass *obj) { }

i want const make clear obj not going changed since passing raw pointer. inside foo have

int anotherclass::foo(const myclass *obj) {     int number = obj->num_points()-1; }

and compiler complaining "the object has type qualifiers not compatible member function". num_points simple function declared , defined in header:

class myclass { public:   ...   int num_points(){return _points.size();}   ... private:   std::vector<mypoint> _points; };

what's best way around this? can rid of const requirement in foo rigidity imposes. many in advance!

make member function const:

int num_points() const // <--- {     return _points.size(); }

this way can call on const objects. in habbit qualify every function doesn't alter object's state.

Live