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One notable C preprocessor directive is <code>[[pragma once|#pragma once]]</code>, which instructs the compiler to include the current source file only once, making it effectively [[idempotent]], and providing an alternative in C and C++ to [[include guard|#include guards]].
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Syntactic constructs similar to C's preprocessor directives, such as [[C Sharp (programming language)|C#]]'s <code>#region</code>, are also typically called "directives", although in these cases there may not be any real preprocessing phase involved.
==In other high-level languages==
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