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}}</ref>
The [[C Sharp (programming language)|C#]] programming language also allows for directives,
The [[Haskell]] programming language also allows the usage of the C preprocessor
Features of the preprocessor are encoded in [[source code]] as [[Directive (programming)|directives]] that start with <code>#</code>.
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Until [[C++26]], the C++ keywords <code>import</code>, <code>export</code>, and <code>module</code> were partially handled by the preprocessor as well.
The Haskell programming language also accepts C preprocessor directives, which is invoked by writing <syntaxhighlight lang="Haskell" inline>{-# LANGUAGE CPP #-}</syntaxhighlight> at the top of the file. The accepted preprocessor directives align with those in standard C/C++.
=== C# ===
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==== Binary resource inclusion ====
[[C23 (C standard revision)|C23]] and [[C++26]] introduce the <code>#embed</code> directive for '''binary resource inclusion''' which allows including the content of a binary file into a source even
This allows binary resources (like images) to be included into a program without requiring processing by external tools like <code>xxd -i</code> and without the use of [[string literal]]s which have a length limit on [[MSVC]]. Similarly to <code>xxd -i</code> the directive is replaced by a comma separated list of integers corresponding to the data of the specified resource. More precisely, if an array of type {{code|unsigned char}} is initialized using an <code>#embed</code> directive, the result is the same as-if the resource was written to the array using <code>[[fread]]</code> (unless a parameter changes the embed element width to something other than <code>[[Limits.h|CHAR_BIT]]</code>). Apart from the convenience, <code>#embed</code> is also easier <!--than what?--> for compilers to handle, since they are allowed to skip expanding the directive to its full form due to the [[as-if rule]].
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<syntaxhighlight lang="cpp">
const unsigned char
#embed "art.png"
};
/* specify any type which can be initialized form integer constant expressions will do */
const char
#embed "data.bin"
};
/* attributes work just as well */
const signed char
#embed "attributes.xml"
};
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==Non-standard features ==
===
The <code>#pragma</code> directive is defined by standard languages, but with little or no requirements for syntax after its name so that compilers are free to define subsequent syntax and associated behavior. For instance, a pragma is often used to allow suppression of error messages, manage heap and stack debugging and so on.
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Some [[Unix]] preprocessors provided an [[assertion (computing)|assertion]] feature {{endash}} which has little similarity to standard library assertions.<ref>[https://gcc.gnu.org/onlinedocs/cpp/Obsolete-Features.html GCC Obsolete features]</ref>
===
GCC provides <code>#include_next</code> for chaining headers of the same name.<ref>{{Cite web|url=https://gcc.gnu.org/onlinedocs/cpp/Wrapper-Headers.html|title = Wrapper Headers (The C Preprocessor)}}</ref>
===
Unlike C and C++, Objective-C includes an <code>#import</code> directive that is like <code>#include</code> but results in a file being included only once {{endash}} eliminating the need for include guards and [[pragma once|<code>#pragma once</code>]].
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The null directive, which consists only of the <code>#</code> character, alone on a single line, is a non-standard directive in Microsoft Visual C++. It has no effect.<ref>{{Cite web|title=Null directive|url=https://learn.microsoft.com/en-us/cpp/preprocessor/null-directive|publisher=learn.microsoft.com}}</ref>
===
The <code>#nullable</code> directive in C# is used to enable and disable nullable reference types. To enable them, use <code>#nullable enable</code>, and <code>#nullable disable</code> to disable them.
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This directive does not exist in C/C++.
===
The <code>#region</code> and <code>#endregion</code> directives in C# are used to expand/collapse sections of code in IDEs, and has no effect on actual compilation of the program. It is primarily used for code organisation and readability.
<syntaxhighlight lang="csharp">
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</syntaxhighlight>
===
[[C++/CLI]] has the <code>#using</code> directive, which is used to import metadata into a program from a Microsoft Intermediate Language file (such as a {{mono|.dll}} file).<ref>{{Cite web|title=#using directive (C++/CLI)|url=https://learn.microsoft.com/en-us/cpp/preprocessor/hash-using-directive-cpp|publisher=learn.microsoft.com|date=29 June 2022}}</ref>
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|title=An empirical analysis of c preprocessor use |journal=IEEE Transactions on Software Engineering |url = http://dl.acm.org/citation.cfm?id=631305
|date = December 2002
|volume=28 |issue=12 |pages=1146–1170 |doi=10.1109/TSE.2002.1158288 |bibcode=2002ITSEn..28.1146E |url-access=subscription }}</ref>
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