mk1x86

Usually a third degree polynomial is sufficient. You can edit it by changing the tangents of the start and end point. Then there's (B-)splines obviously, but that requires a fair amount of calculation time. You can also take a look at Lagrange interpolation.

The best thing you can do is to write an editor that allows different interpolation types for pieces of your timeline.

The only difference between delete and delete[] is, that in the latter case the object destructor isn't called for the pointer address only but all subsequent "positions" in the array until the end of the memory block is reached. In theory it should be save to always call delete[] since the memory block would have only sizeof(object). But it's better to follow the rules to ensure compiler compability. You should also consider using dynamic arrays like std::vector which does the gritty things for you.