Discussion
What is the use of "#pragma once"?
Answer: A
Correct answer: Used in a header file to avoid its inclusion more than once
#pragma once tells the preprocessor to include the file at most once per translation unit, however many times it is named. It does the same job as the traditional include guard (#ifndef HDR_H / #define HDR_H / #endif) with less typing, at the cost of not being in the standard - though every mainstream compiler supports it.
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