A question about cpp coverage

[robertLiuLinFeng]

I used gtest as my unit test framework and OpenCppCoverage to generge code coverage reports.
For a cpp source file, each line is eithor covered or not covered, except that include not need to be counted.
But In my coverage report, the rows that are covered and uncovered are only a part of the file, and the other rows are not counted. What's the reason for this?
What should I do if I want to count all the rows of source file?
Thank you very much and look forward to your reply.

[SteveGilham]

The lines that are neither red nor green are lines where there is no executable code for the program flow to reach -- comments, blank lines, some curly brackets, lines with only a flow-of-control keyword like else or try. The program works by setting every possible debugger breakpoint (as a measure of everywhere the program is), and tracks which ones are taken.

[GitMensch]

I suggest this Q+A to be possibly added to the FAQ, but closed as issue.