Let's consider a code example showing what would be allowed (or not) using different levels of inheritance: 1  class BaseClass {}; void freeStandingFunction(BaseClass* b); class DerivedProtected : protected BaseClass { DerivedProtected() { freeStandingFunction(this); // Allowed } };
Definition of Horizontal Axis. Horizontal means flat or level. Horizontal axis is the x-axis on a graph. The blue number line in the figure below is the x-axis, the horizontal axis.
Always think of the 'Horizon' for Horizontal. For 'Vertical' think of jets that can sometimes fly straight up. make the horizon your line of preference. if it is along the horizon, or left to right, it means the line is horizontal. if not, means its up to down, it is vertical. Right to left. Up and down would be the vertical axis.