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Important This document may not represent best practices for current development, links to downloads and other resources may no longer be valid. Current recommended version can be found here.

once

Specifies that the file will be included (opened) only once by the compiler when compiling a source code file.


#pragma once

This can reduce build times as the compiler will not open and read the file after the first #include of the module.

For example:

// header.h
#pragma once
....

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