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mw-first-heading"><span class="mw-page-title-main">Void type</span></h1> <div id="p-lang-btn" class="vector-dropdown mw-portlet mw-portlet-lang" > <input type="checkbox" id="p-lang-btn-checkbox" role="button" aria-haspopup="true" data-event-name="ui.dropdown-p-lang-btn" class="vector-dropdown-checkbox mw-interlanguage-selector" aria-label="Go to an article in another language. Available in 13 languages" > <label id="p-lang-btn-label" for="p-lang-btn-checkbox" class="vector-dropdown-label cdx-button cdx-button--fake-button cdx-button--fake-button--enabled cdx-button--weight-quiet cdx-button--action-progressive mw-portlet-lang-heading-13" aria-hidden="true" ><span class="vector-icon mw-ui-icon-language-progressive mw-ui-icon-wikimedia-language-progressive"></span> <span class="vector-dropdown-label-text">13 languages</span> </label> <div class="vector-dropdown-content"> <div class="vector-menu-content"> <ul class="vector-menu-content-list"> <li class="interlanguage-link interwiki-cs mw-list-item"><a href="https://cs.wikipedia.org/wiki/Void_(programov%C3%A1n%C3%AD)" title="Void (programování) – Czech" lang="cs" hreflang="cs" data-title="Void (programování)" data-language-autonym="Čeština" data-language-local-name="Czech" class="interlanguage-link-target"><span>Čeština</span></a></li><li class="interlanguage-link interwiki-de mw-list-item"><a href="https://de.wikipedia.org/wiki/Void_(Schl%C3%BCsselwort)" title="Void (Schlüsselwort) – German" lang="de" hreflang="de" data-title="Void (Schlüsselwort)" data-language-autonym="Deutsch" data-language-local-name="German" class="interlanguage-link-target"><span>Deutsch</span></a></li><li class="interlanguage-link interwiki-fa mw-list-item"><a href="https://fa.wikipedia.org/wiki/%D9%86%D9%88%D8%B9_void" title="نوع void – Persian" lang="fa" hreflang="fa" data-title="نوع void" data-language-autonym="فارسی" data-language-local-name="Persian" class="interlanguage-link-target"><span>فارسی</span></a></li><li class="interlanguage-link interwiki-fr mw-list-item"><a href="https://fr.wikipedia.org/wiki/Void" title="Void – French" lang="fr" hreflang="fr" data-title="Void" data-language-autonym="Français" data-language-local-name="French" class="interlanguage-link-target"><span>Français</span></a></li><li class="interlanguage-link interwiki-ko mw-list-item"><a href="https://ko.wikipedia.org/wiki/Void_%ED%83%80%EC%9E%85" title="Void 타입 – Korean" lang="ko" hreflang="ko" data-title="Void 타입" data-language-autonym="한국어" data-language-local-name="Korean" class="interlanguage-link-target"><span>한국어</span></a></li><li class="interlanguage-link interwiki-it mw-list-item"><a href="https://it.wikipedia.org/wiki/Void_(informatica)" title="Void (informatica) – Italian" lang="it" hreflang="it" data-title="Void (informatica)" data-language-autonym="Italiano" data-language-local-name="Italian" class="interlanguage-link-target"><span>Italiano</span></a></li><li class="interlanguage-link interwiki-ja mw-list-item"><a href="https://ja.wikipedia.org/wiki/Void_(%E3%82%B3%E3%83%B3%E3%83%94%E3%83%A5%E3%83%BC%E3%82%BF)" title="Void (コンピュータ) – Japanese" lang="ja" hreflang="ja" data-title="Void (コンピュータ)" data-language-autonym="日本語" data-language-local-name="Japanese" class="interlanguage-link-target"><span>日本語</span></a></li><li class="interlanguage-link interwiki-pl mw-list-item"><a href="https://pl.wikipedia.org/wiki/Pusty_typ_danych" title="Pusty typ danych – Polish" lang="pl" hreflang="pl" data-title="Pusty typ danych" data-language-autonym="Polski" data-language-local-name="Polish" class="interlanguage-link-target"><span>Polski</span></a></li><li class="interlanguage-link interwiki-ru mw-list-item"><a href="https://ru.wikipedia.org/wiki/Void" title="Void – Russian" lang="ru" hreflang="ru" data-title="Void" data-language-autonym="Русский" data-language-local-name="Russian" class="interlanguage-link-target"><span>Русский</span></a></li><li class="interlanguage-link interwiki-sk mw-list-item"><a href="https://sk.wikipedia.org/wiki/Void_(informatika)" title="Void (informatika) – Slovak" lang="sk" hreflang="sk" data-title="Void (informatika)" data-language-autonym="Slovenčina" data-language-local-name="Slovak" class="interlanguage-link-target"><span>Slovenčina</span></a></li><li class="interlanguage-link interwiki-uk mw-list-item"><a href="https://uk.wikipedia.org/wiki/Void" title="Void – Ukrainian" lang="uk" hreflang="uk" data-title="Void" data-language-autonym="Українська" data-language-local-name="Ukrainian" class="interlanguage-link-target"><span>Українська</span></a></li><li class="interlanguage-link interwiki-vi mw-list-item"><a href="https://vi.wikipedia.org/wiki/Void_(ki%E1%BB%83u_d%E1%BB%AF_li%E1%BB%87u)" title="Void (kiểu dữ liệu) – Vietnamese" lang="vi" hreflang="vi" data-title="Void (kiểu dữ liệu)" data-language-autonym="Tiếng Việt" data-language-local-name="Vietnamese" class="interlanguage-link-target"><span>Tiếng Việt</span></a></li><li class="interlanguage-link interwiki-zh mw-list-item"><a href="https://zh.wikipedia.org/wiki/Void" title="Void – Chinese" lang="zh" hreflang="zh" data-title="Void" data-language-autonym="中文" data-language-local-name="Chinese" class="interlanguage-link-target"><span>中文</span></a></li> </ul> <div class="after-portlet after-portlet-lang"><span class="wb-langlinks-edit 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i{font-style:normal}.mw-parser-output .hatnote+link+.hatnote{margin-top:-0.5em}@media print{body.ns-0 .mw-parser-output .hatnote{display:none!important}}</style><div role="note" class="hatnote navigation-not-searchable">This article is about the void type in computer programming languages. For the concept of a void pointer, see <a href="/wiki/Pointer_(computer_programming)#C_and_C++" title="Pointer (computer programming)">Pointer (computer programming) § C and C++</a>. For types of astronomical voids, see <a href="/wiki/Void_(astronomy)" title="Void (astronomy)">Void (astronomy)</a>. For other uses, see <a href="/wiki/Void_(disambiguation)" class="mw-redirect mw-disambig" title="Void (disambiguation)">Void (disambiguation)</a>.</div> <p>The <b>void type</b>, in several <a href="/wiki/Programming_languages" class="mw-redirect" title="Programming languages">programming languages</a>, more so <a href="/wiki/Curly_bracket_programming_language" class="mw-redirect" title="Curly bracket programming language">curly bracket programming languages</a> derived from <a href="/wiki/C_(programming_language)" title="C (programming language)">C</a> and <a href="/wiki/ALGOL_68" title="ALGOL 68">ALGOL 68</a>, is the <a href="/wiki/Return_type" title="Return type">return type</a> of a <a href="/wiki/Function_(computer_programming)" title="Function (computer programming)">function</a> that <a href="/wiki/Return_statement" title="Return statement">returns</a> normally, but provides no result value to its caller. Usually such functions are called for their <a href="/wiki/Side_effect_(computer_science)" title="Side effect (computer science)">side effects</a>, such as performing some task or writing to their output parameters. The use of the void <a href="/wiki/Data_type" title="Data type">data type</a> in such context is comparable to <i>procedures</i> in <a href="/wiki/Pascal_(programming_language)" title="Pascal (programming language)">Pascal</a> and <a href="/wiki/Syntax_(programming_languages)" title="Syntax (programming languages)">syntactic</a> constructs which define <i>subroutines</i> in <a href="/wiki/Visual_Basic" title="Visual Basic">Visual Basic</a>. It is also similar to the <a href="/wiki/Unit_type" title="Unit type">unit type</a> used in <a href="/wiki/Functional_programming" title="Functional programming">functional programming</a> languages and type theory. See <a href="/wiki/Unit_type#In_programming_languages" title="Unit type">Unit type#In programming languages</a> for a comparison. </p><p>C and <a href="/wiki/C%2B%2B" title="C++">C++</a> also support the <b>pointer to void type</b> (specified as <code>void *</code>), but this is an unrelated notion. Variables of this type are <a href="/wiki/Pointer_(computer_programming)" title="Pointer (computer programming)">pointers</a> to data of an <i>unspecified</i> type, so in this context (but not the others) <code>void *</code> acts roughly like a universal or <a href="/wiki/Top_type" title="Top type">top type</a>. A program can convert a pointer to any type of data (except a <a href="/wiki/Function_pointer" title="Function pointer">function pointer</a>) to a pointer to void and back to the original type without losing information, which makes these pointers useful for <a href="/wiki/Polymorphism_(computer_science)" title="Polymorphism (computer science)">polymorphic</a> functions. The C language standard does not guarantee that the different pointer types have the same size or alignment. </p> <meta property="mw:PageProp/toc" /> <div class="mw-heading mw-heading2"><h2 id="In_C_and_C++"><span id="In_C_and_C.2B.2B"></span>In C and C++</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Void_type&action=edit&section=1" title="Edit section: In C and C++"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <p>A function with void result type ends either by reaching the end of the function or by executing a <a href="/wiki/Return_statement" title="Return statement">return statement</a> with no returned value. The void type may also replace the <a href="/wiki/Parameter_(computer_programming)" title="Parameter (computer programming)">argument list</a> of a <a href="/wiki/Function_prototype" title="Function prototype">function prototype</a> to indicate that the function takes no arguments. Note that in all of these situations, void is <i>not</i> a type qualifier on any value. Despite the name, this is semantically similar to an implicit <a href="/wiki/Unit_type" title="Unit type">unit type</a>, not a zero or <a href="/wiki/Bottom_type" title="Bottom type">bottom type</a> (which is sometimes confusingly called the "void type"). Unlike a real unit type which is a singleton, the void type lacks a way to represent its value and the language does not provide any way to declare an object or represent a value with type <code>void</code>. </p><p>In the earliest versions of C, functions with no specific result defaulted to a return type of <code>int</code> and functions with no arguments simply had empty argument lists. Pointers to untyped data were declared as integers or pointers to <code>char</code>. Some early C <a href="/wiki/Compiler" title="Compiler">compilers</a> had the feature, now seen as an annoyance, of generating a warning on any function call that did not use the function's returned value. Old code sometimes <a href="/wiki/Type_conversion" title="Type conversion">casts</a> such function calls to void to suppress this warning. By the time <a href="/wiki/Bjarne_Stroustrup" title="Bjarne Stroustrup">Bjarne Stroustrup</a> began his work on C++ in 1979–1980,<sup class="noprint Inline-Template Template-Fact" style="white-space:nowrap;">[<i><a href="/wiki/Wikipedia:Citation_needed" title="Wikipedia:Citation needed"><span title="This claim needs references to reliable sources. (May 2021)">citation needed</span></a></i>]</sup> void and void pointers were part of the C language dialect supported by AT&T-derived compilers.<sup id="cite_ref-1" class="reference"><a href="#cite_note-1"><span class="cite-bracket">[</span>1<span class="cite-bracket">]</span></a></sup> </p><p>The explicit use of void vs. giving no arguments in a <a href="/wiki/Function_prototype" title="Function prototype">function prototype</a> has different semantics in C and C++, as detailed in this table:<sup id="cite_ref-2" class="reference"><a href="#cite_note-2"><span class="cite-bracket">[</span>2<span class="cite-bracket">]</span></a></sup> </p> <table class="wikitable" border="1"> <tbody><tr> <th>C </th> <th>C++ equivalent </th></tr> <tr> <td><code>void f(void);</code> </td> <td><code>void f();</code> (<i>preferred</i>)<br /> <code>void f(void);</code> </td></tr> <tr> <td><code>void f();</code> (<i>accepts a constant but unknown number of arguments</i>) </td> <td><code>template <typename... Ts> void f(Ts... ts) {}</code> <p>(not strictly equivalent) </p> </td></tr></tbody></table> <p>The C syntax to declare a (non-variadic) function with an as-yet-unspecified number of parameters, e.g. <code>void f()</code> above, was deprecated in <a href="/wiki/C99" title="C99">C99</a>.<sup id="cite_ref-3" class="reference"><a href="#cite_note-3"><span class="cite-bracket">[</span>3<span class="cite-bracket">]</span></a></sup> In <a href="/wiki/C23_(C_standard_revision)" title="C23 (C standard revision)">C23</a> (and C++), a function prototype with empty parentheses declares a function with zero parameters.<sup id="cite_ref-N2432_4-0" class="reference"><a href="#cite_note-N2432-4"><span class="cite-bracket">[</span>4<span class="cite-bracket">]</span></a></sup><sup id="cite_ref-N2841_5-0" class="reference"><a href="#cite_note-N2841-5"><span class="cite-bracket">[</span>5<span class="cite-bracket">]</span></a></sup> </p> <div class="mw-heading mw-heading2"><h2 id="In_Haskell">In Haskell</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Void_type&action=edit&section=2" title="Edit section: In Haskell"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1236090951" /><div role="note" class="hatnote navigation-not-searchable">Further information: <a href="/wiki/Empty_type" title="Empty type">Empty type</a></div> <p>In contrast to C++, in the <a href="/wiki/Functional_programming" title="Functional programming">functional programming</a> language <a href="/wiki/Haskell" title="Haskell">Haskell</a>, the void type denotes the <a href="/wiki/Empty_type" title="Empty type">empty type</a>, which has no inhabitants <a rel="nofollow" class="external autonumber" href="http://hackage.haskell.org/package/void">[1]</a>. A function into the void type does not return results, and a side-effectful program with type signature <code>IO Void</code> does not terminate, or crashes. In particular, there are no <a href="/wiki/Partial_function" title="Partial function">total functions</a> into the void type. </p> <div class="mw-heading mw-heading2"><h2 id="See_also">See also</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Void_type&action=edit&section=3" title="Edit section: See also"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <ul><li><a href="/wiki/Null_pointer" title="Null pointer">Null pointer</a></li></ul> <div class="mw-heading mw-heading2"><h2 id="References">References</h2><span class="mw-editsection"><span class="mw-editsection-bracket">[</span><a href="/w/index.php?title=Void_type&action=edit&section=4" title="Edit section: References"><span>edit</span></a><span class="mw-editsection-bracket">]</span></span></div> <style data-mw-deduplicate="TemplateStyles:r1239543626">.mw-parser-output .reflist{margin-bottom:0.5em;list-style-type:decimal}@media screen{.mw-parser-output .reflist{font-size:90%}}.mw-parser-output .reflist .references{font-size:100%;margin-bottom:0;list-style-type:inherit}.mw-parser-output .reflist-columns-2{column-width:30em}.mw-parser-output .reflist-columns-3{column-width:25em}.mw-parser-output .reflist-columns{margin-top:0.3em}.mw-parser-output .reflist-columns ol{margin-top:0}.mw-parser-output .reflist-columns li{page-break-inside:avoid;break-inside:avoid-column}.mw-parser-output .reflist-upper-alpha{list-style-type:upper-alpha}.mw-parser-output .reflist-upper-roman{list-style-type:upper-roman}.mw-parser-output .reflist-lower-alpha{list-style-type:lower-alpha}.mw-parser-output .reflist-lower-greek{list-style-type:lower-greek}.mw-parser-output .reflist-lower-roman{list-style-type:lower-roman}</style><div class="reflist reflist-columns references-column-width reflist-columns-2"> <ol class="references"> <li id="cite_note-1"><span class="mw-cite-backlink"><b><a href="#cite_ref-1">^</a></b></span> <span class="reference-text"><style data-mw-deduplicate="TemplateStyles:r1238218222">.mw-parser-output cite.citation{font-style:inherit;word-wrap:break-word}.mw-parser-output .citation q{quotes:"\"""\"""'""'"}.mw-parser-output .citation:target{background-color:rgba(0,127,255,0.133)}.mw-parser-output .id-lock-free.id-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/6/65/Lock-green.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-limited.id-lock-limited a,.mw-parser-output .id-lock-registration.id-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/d/d6/Lock-gray-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .id-lock-subscription.id-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/a/aa/Lock-red-alt-2.svg")right 0.1em center/9px no-repeat}.mw-parser-output .cs1-ws-icon a{background:url("//upload.wikimedia.org/wikipedia/commons/4/4c/Wikisource-logo.svg")right 0.1em center/12px no-repeat}body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-free a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-limited a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-registration a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .id-lock-subscription a,body:not(.skin-timeless):not(.skin-minerva) .mw-parser-output .cs1-ws-icon a{background-size:contain;padding:0 1em 0 0}.mw-parser-output .cs1-code{color:inherit;background:inherit;border:none;padding:inherit}.mw-parser-output .cs1-hidden-error{display:none;color:var(--color-error,#d33)}.mw-parser-output .cs1-visible-error{color:var(--color-error,#d33)}.mw-parser-output .cs1-maint{display:none;color:#085;margin-left:0.3em}.mw-parser-output .cs1-kern-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right{padding-right:0.2em}.mw-parser-output .citation .mw-selflink{font-weight:inherit}@media screen{.mw-parser-output .cs1-format{font-size:95%}html.skin-theme-clientpref-night .mw-parser-output .cs1-maint{color:#18911f}}@media screen and (prefers-color-scheme:dark){html.skin-theme-clientpref-os .mw-parser-output .cs1-maint{color:#18911f}}</style><cite id="CITEREFRitchie1993" class="citation web cs1"><a href="/wiki/Dennis_Ritchie" title="Dennis Ritchie">Ritchie, Dennis M.</a> (1993). <a rel="nofollow" class="external text" href="https://web.archive.org/web/19980220175804/http://cm.bell-labs.com/cm/cs/who/dmr/chist.html">"The Development of the C Language"</a>. Association for Computing Machinery, Inc. Archived from <a rel="nofollow" class="external text" href="http://cm.bell-labs.com/cm/cs/who/dmr/chist.html">the original</a> on 1998-02-20 – via author and Lucent Technologies Inc. 1996.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=unknown&rft.btitle=The+Development+of+the+C+Language&rft.pub=Association+for+Computing+Machinery%2C+Inc.&rft.date=1993&rft.aulast=Ritchie&rft.aufirst=Dennis+M.&rft_id=http%3A%2F%2Fcm.bell-labs.com%2Fcm%2Fcs%2Fwho%2Fdmr%2Fchist.html&rfr_id=info%3Asid%2Fen.wikipedia.org%3AVoid+type" class="Z3988"></span></span> </li> <li id="cite_note-2"><span class="mw-cite-backlink"><b><a href="#cite_ref-2">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" /><cite id="CITEREFStroustrup2009" class="citation book cs1"><a href="/wiki/Bjarne_Stroustrup" title="Bjarne Stroustrup">Stroustrup, Bjarne</a> (2009). <i>Programming: Principles and Practice Using C++</i>. Boston: Addison-Wesley. p. 996. <a href="/wiki/ISBN_(identifier)" class="mw-redirect" title="ISBN (identifier)">ISBN</a> <a href="/wiki/Special:BookSources/978-0-321-54372-1" title="Special:BookSources/978-0-321-54372-1"><bdi>978-0-321-54372-1</bdi></a>.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Abook&rft.genre=book&rft.btitle=Programming%3A+Principles+and+Practice+Using+C%2B%2B&rft.place=Boston&rft.pages=996&rft.pub=Addison-Wesley&rft.date=2009&rft.isbn=978-0-321-54372-1&rft.aulast=Stroustrup&rft.aufirst=Bjarne&rfr_id=info%3Asid%2Fen.wikipedia.org%3AVoid+type" class="Z3988"></span></span> </li> <li id="cite_note-3"><span class="mw-cite-backlink"><b><a href="#cite_ref-3">^</a></b></span> <span class="reference-text">Bjarne Stroustrup, <i><a rel="nofollow" class="external text" href="http://www.ddj.com/cpp/184401562">C and C++: Case Studies in Compatibility. Reconcilable differences? You decide</a></i>, <a href="/wiki/Dr._Dobb%27s" class="mw-redirect" title="Dr. Dobb's">Dr. Dobb's</a>, September 01, 2002; <a rel="nofollow" class="external text" href="http://www.research.att.com/~bs/examples_short.pdf">print version</a></span> </li> <li id="cite_note-N2432-4"><span class="mw-cite-backlink"><b><a href="#cite_ref-N2432_4-0">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" /><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://www.open-std.org/jtc1/sc22/wg14/www/docs/n2432.pdf">"WG14-N2432: Remove support for function definitions with identifier lists proposal"</a> <span class="cs1-format">(PDF)</span>. <i>open-std.org</i>. September 25, 2019. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20221227012244/https://www.open-std.org/jtc1/sc22/wg14/www/docs/n2432.pdf">Archived</a> <span class="cs1-format">(PDF)</span> from the original on December 27, 2022.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=open-std.org&rft.atitle=WG14-N2432%3A+Remove+support+for+function+definitions+with+identifier+lists+proposal&rft.date=2019-09-25&rft_id=https%3A%2F%2Fwww.open-std.org%2Fjtc1%2Fsc22%2Fwg14%2Fwww%2Fdocs%2Fn2432.pdf&rfr_id=info%3Asid%2Fen.wikipedia.org%3AVoid+type" class="Z3988"></span></span> </li> <li id="cite_note-N2841-5"><span class="mw-cite-backlink"><b><a href="#cite_ref-N2841_5-0">^</a></b></span> <span class="reference-text"><link rel="mw-deduplicated-inline-style" href="mw-data:TemplateStyles:r1238218222" /><cite class="citation web cs1"><a rel="nofollow" class="external text" href="https://www.open-std.org/jtc1/sc22/wg14/www/docs/n2841.htm">"WG14-N2841: No function declarators without prototypes"</a>. <i>open-std.org</i>. 2021-10-10. <a rel="nofollow" class="external text" href="https://web.archive.org/web/20221112154740/https://www9.open-std.org/jtc1/sc22/wg14/www/docs/n2841.htm">Archived</a> from the original on November 12, 2022.</cite><span title="ctx_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.genre=unknown&rft.jtitle=open-std.org&rft.atitle=WG14-N2841%3A+No+function+declarators+without+prototypes&rft.date=2021-10-10&rft_id=https%3A%2F%2Fwww.open-std.org%2Fjtc1%2Fsc22%2Fwg14%2Fwww%2Fdocs%2Fn2841.htm&rfr_id=info%3Asid%2Fen.wikipedia.org%3AVoid+type" class="Z3988"></span></span> </li> </ol></div> <div class="navbox-styles"><style data-mw-deduplicate="TemplateStyles:r1129693374">.mw-parser-output .hlist dl,.mw-parser-output .hlist ol,.mw-parser-output .hlist ul{margin:0;padding:0}.mw-parser-output .hlist dd,.mw-parser-output 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title="Object (computer science)">Object</a> <ul><li><a href="/wiki/Metaobject" title="Metaobject">metaobject</a></li></ul></li> <li><a href="/wiki/Option_type" title="Option type">Option type</a></li> <li><a href="/wiki/Product_type" title="Product type">Product</a></li> <li><a href="/wiki/Record_(computer_science)" title="Record (computer science)">Record or Struct</a></li> <li><a href="/wiki/Refinement_type" title="Refinement type">Refinement</a></li> <li><a href="/wiki/Set_(abstract_data_type)" title="Set (abstract data type)">Set</a></li> <li><a href="/wiki/Union_type" title="Union type">Union</a> <ul><li><a href="/wiki/Tagged_union" title="Tagged union">tagged</a></li></ul></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Other</th><td class="navbox-list-with-group navbox-list navbox-even" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Boolean_data_type" title="Boolean data type">Boolean</a></li> <li><a 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title="Type class">Type class</a></li> <li><a href="/wiki/Empty_type" title="Empty type">Empty type</a></li> <li><a href="/wiki/Unit_type" title="Unit type">Unit type</a></li> <li><a class="mw-selflink selflink">Void</a></li></ul> </div></td></tr><tr><th scope="row" class="navbox-group" style="width:1%">Related<br />topics</th><td class="navbox-list-with-group navbox-list navbox-odd" style="width:100%;padding:0"><div style="padding:0 0.25em"> <ul><li><a href="/wiki/Abstract_data_type" title="Abstract data type">Abstract data type</a></li> <li><a href="/wiki/Boxing_(computer_science)" class="mw-redirect" title="Boxing (computer science)">Boxing</a></li> <li><a href="/wiki/Data_structure" title="Data structure">Data structure</a></li> <li><a href="/wiki/Generic_programming" title="Generic programming">Generic</a></li> <li><a href="/wiki/Kind_(type_theory)" title="Kind (type theory)">Kind</a> <ul><li><a href="/wiki/Metaclass" title="Metaclass">metaclass</a></li></ul></li> <li><a href="/wiki/Parametric_polymorphism" title="Parametric polymorphism">Parametric polymorphism</a></li> <li><a href="/wiki/Primitive_data_type" title="Primitive data type">Primitive data type</a></li> <li><a href="/wiki/Interface_(object-oriented_programming)" title="Interface (object-oriented programming)">Interface</a></li> <li><a href="/wiki/Subtyping" title="Subtyping">Subtyping</a></li> <li><a href="/wiki/Type_constructor" title="Type constructor">Type constructor</a></li> <li><a href="/wiki/Type_conversion" title="Type conversion">Type conversion</a></li> <li><a href="/wiki/Type_system" title="Type system">Type system</a></li> <li><a href="/wiki/Type_theory" title="Type theory">Type theory</a></li> <li><a href="/wiki/Variable_(computer_science)" title="Variable (computer science)">Variable</a></li></ul> </div></td></tr></tbody></table></div>    </div><noscript><img src="https://login.wikimedia.org/wiki/Special:CentralAutoLogin/start?useformat=desktop&type=1x1&usesul3=0" alt="" 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