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.
Definition of vertical. 1a : perpendicular to the plane of the horizon or to a primary axis : uprightb (1) : located at right angles to the plane of a supporting surface (2) : lying in the direction of an axis : lengthwise.