I have a big vector container that holds around 300.000 object. Also I have pointers to these objects.
Are there any fast way to get index of object in vector with using pointer?
Since vectors are organized sequentially, you can get an index by subtracting pointer to initial element from the pointer to element in question:
std::vector<MyObject> vect; MyObject *ptrX = ... // Pointer to element in question ptrdiff_t index = ptrX - &vect;