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.
Usually, it is collected in a table -- this is the default presentation of a spreadsheet, for example. However, that data can then be represented on a graph, with axes corresponding to the different variables in the table. A horizontal axis on a graph corresponds to one variable from a data table.