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.
4. Conventions for which axis is vertical vary across different domains and even within domains: sometimes it's z, sometimes it's y. The direction of the vertical axis also varies: sometimes the up direction is positive along the vertical axis, sometimes it's negative.