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Add pragma once to the documentation
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@ -1681,6 +1681,16 @@ void somefunc2(int, char *);
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</verb></tscreen>
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<sect1><tt>#pragma once</tt><label="pragma-once"><p>
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This pragma is used to prevent multiple inclusion of a header file.
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If this pragma is preprocessed in a file, any posterior
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<tt>#include<tt> which targets the current file will be ignored.
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Two files are considered to be the same by this directive if they
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share the same absolute path. In the case of symbolic links,
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the canonical, resolved path is considered instead.
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<sect>Register variables<label id="register-vars"><p>
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