| <html lang="en"> |
| <head> |
| <title>Concept Index - The C Preprocessor</title> |
| <meta http-equiv="Content-Type" content="text/html"> |
| <meta name="description" content="The C Preprocessor"> |
| <meta name="generator" content="makeinfo 4.13"> |
| <link title="Top" rel="start" href="index.html#Top"> |
| <link rel="prev" href="Option-Index.html#Option-Index" title="Option Index"> |
| <link href="http://www.gnu.org/software/texinfo/" rel="generator-home" title="Texinfo Homepage"> |
| <!-- |
| Copyright (C) 1987, 1989, 1991, 1992, 1993, 1994, 1995, 1996, |
| 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, |
| 2008, 2009, 2010 |
| Free Software Foundation, Inc. |
| |
| Permission is granted to copy, distribute and/or modify this document |
| under the terms of the GNU Free Documentation License, Version 1.2 or |
| any later version published by the Free Software Foundation. A copy of |
| the license is included in the |
| section entitled ``GNU Free Documentation License''. |
| |
| This manual contains no Invariant Sections. The Front-Cover Texts are |
| (a) (see below), and the Back-Cover Texts are (b) (see below). |
| |
| (a) The FSF's Front-Cover Text is: |
| |
| A GNU Manual |
| |
| (b) The FSF's Back-Cover Text is: |
| |
| You have freedom to copy and modify this GNU Manual, like GNU |
| software. Copies published by the Free Software Foundation raise |
| funds for GNU development. |
| --> |
| <meta http-equiv="Content-Style-Type" content="text/css"> |
| <style type="text/css"><!-- |
| pre.display { font-family:inherit } |
| pre.format { font-family:inherit } |
| pre.smalldisplay { font-family:inherit; font-size:smaller } |
| pre.smallformat { font-family:inherit; font-size:smaller } |
| pre.smallexample { font-size:smaller } |
| pre.smalllisp { font-size:smaller } |
| span.sc { font-variant:small-caps } |
| span.roman { font-family:serif; font-weight:normal; } |
| span.sansserif { font-family:sans-serif; font-weight:normal; } |
| --></style> |
| <link rel="stylesheet" type="text/css" href="../cs.css"> |
| </head> |
| <body> |
| <div class="node"> |
| <a name="Concept-Index"></a> |
| <p> |
| Previous: <a rel="previous" accesskey="p" href="Option-Index.html#Option-Index">Option Index</a>, |
| Up: <a rel="up" accesskey="u" href="index.html#Top">Top</a> |
| <hr> |
| </div> |
| |
| <h2 class="unnumbered">Concept Index</h2> |
| |
| |
| |
| <ul class="index-cp" compact> |
| <li><a href="Stringification.html#index-g_t_0040samp_007b_0023_007d-operator-51">‘<samp><span class="samp">#</span></samp>’ operator</a>: <a href="Stringification.html#Stringification">Stringification</a></li> |
| <li><a href="Concatenation.html#index-g_t_0040samp_007b_0023_0023_007d-operator-55">‘<samp><span class="samp">##</span></samp>’ operator</a>: <a href="Concatenation.html#Concatenation">Concatenation</a></li> |
| <li><a href="Pragmas.html#index-g_t_0040code_007b_005fPragma_007d-100"><code>_Pragma</code></a>: <a href="Pragmas.html#Pragmas">Pragmas</a></li> |
| <li><a href="Tokenization.html#index-alternative-tokens-19">alternative tokens</a>: <a href="Tokenization.html#Tokenization">Tokenization</a></li> |
| <li><a href="Macro-Arguments.html#index-arguments-46">arguments</a>: <a href="Macro-Arguments.html#Macro-Arguments">Macro Arguments</a></li> |
| <li><a href="Macro-Arguments.html#index-arguments-in-macro-definitions-48">arguments in macro definitions</a>: <a href="Macro-Arguments.html#Macro-Arguments">Macro Arguments</a></li> |
| <li><a href="Obsolete-Features.html#index-assertions-111">assertions</a>: <a href="Obsolete-Features.html#Obsolete-Features">Obsolete Features</a></li> |
| <li><a href="Obsolete-Features.html#index-assertions_002c-canceling-115">assertions, canceling</a>: <a href="Obsolete-Features.html#Obsolete-Features">Obsolete Features</a></li> |
| <li><a href="Initial-processing.html#index-backslash_002dnewline-4">backslash-newline</a>: <a href="Initial-processing.html#Initial-processing">Initial processing</a></li> |
| <li><a href="Initial-processing.html#index-block-comments-7">block comments</a>: <a href="Initial-processing.html#Initial-processing">Initial processing</a></li> |
| <li><a href="C_002b_002b-Named-Operators.html#index-C_002b_002b-named-operators-66">C++ named operators</a>: <a href="C_002b_002b-Named-Operators.html#C_002b_002b-Named-Operators">C++ Named Operators</a></li> |
| <li><a href="Tokenization.html#index-character-constants-15">character constants</a>: <a href="Tokenization.html#Tokenization">Tokenization</a></li> |
| <li><a href="Invocation.html#index-character-set_002c-execution-174">character set, execution</a>: <a href="Invocation.html#Invocation">Invocation</a></li> |
| <li><a href="Invocation.html#index-character-set_002c-input-178">character set, input</a>: <a href="Invocation.html#Invocation">Invocation</a></li> |
| <li><a href="Invocation.html#index-character-set_002c-wide-execution-176">character set, wide execution</a>: <a href="Invocation.html#Invocation">Invocation</a></li> |
| <li><a href="Invocation.html#index-command-line-119">command line</a>: <a href="Invocation.html#Invocation">Invocation</a></li> |
| <li><a href="Deleted-Code.html#index-commenting-out-code-92">commenting out code</a>: <a href="Deleted-Code.html#Deleted-Code">Deleted Code</a></li> |
| <li><a href="Initial-processing.html#index-comments-5">comments</a>: <a href="Initial-processing.html#Initial-processing">Initial processing</a></li> |
| <li><a href="Common-Predefined-Macros.html#index-common-predefined-macros-61">common predefined macros</a>: <a href="Common-Predefined-Macros.html#Common-Predefined-Macros">Common Predefined Macros</a></li> |
| <li><a href="Computed-Includes.html#index-computed-includes-34">computed includes</a>: <a href="Computed-Includes.html#Computed-Includes">Computed Includes</a></li> |
| <li><a href="Concatenation.html#index-concatenation-52">concatenation</a>: <a href="Concatenation.html#Concatenation">Concatenation</a></li> |
| <li><a href="Ifdef.html#index-conditional-group-87">conditional group</a>: <a href="Ifdef.html#Ifdef">Ifdef</a></li> |
| <li><a href="Conditionals.html#index-conditionals-83">conditionals</a>: <a href="Conditionals.html#Conditionals">Conditionals</a></li> |
| <li><a href="Initial-processing.html#index-continued-lines-3">continued lines</a>: <a href="Initial-processing.html#Initial-processing">Initial processing</a></li> |
| <li><a href="Once_002dOnly-Headers.html#index-controlling-macro-31">controlling macro</a>: <a href="Once_002dOnly-Headers.html#Once_002dOnly-Headers">Once-Only Headers</a></li> |
| <li><a href="Defined.html#index-g_t_0040code_007bdefined_007d-89"><code>defined</code></a>: <a href="Defined.html#Defined">Defined</a></li> |
| <li><a href="Environment-Variables.html#index-dependencies-for-make-as-output-204">dependencies for make as output</a>: <a href="Environment-Variables.html#Environment-Variables">Environment Variables</a></li> |
| <li><a href="Invocation.html#index-dependencies_002c-make-143">dependencies, make</a>: <a href="Invocation.html#Invocation">Invocation</a></li> |
| <li><a href="Diagnostics.html#index-diagnostic-93">diagnostic</a>: <a href="Diagnostics.html#Diagnostics">Diagnostics</a></li> |
| <li><a href="Differences-from-previous-versions.html#index-differences-from-previous-versions-117">differences from previous versions</a>: <a href="Differences-from-previous-versions.html#Differences-from-previous-versions">Differences from previous versions</a></li> |
| <li><a href="Tokenization.html#index-digraphs-18">digraphs</a>: <a href="Tokenization.html#Tokenization">Tokenization</a></li> |
| <li><a href="The-preprocessing-language.html#index-directive-line-23">directive line</a>: <a href="The-preprocessing-language.html#The-preprocessing-language">The preprocessing language</a></li> |
| <li><a href="The-preprocessing-language.html#index-directive-name-24">directive name</a>: <a href="The-preprocessing-language.html#The-preprocessing-language">The preprocessing language</a></li> |
| <li><a href="The-preprocessing-language.html#index-directives-21">directives</a>: <a href="The-preprocessing-language.html#The-preprocessing-language">The preprocessing language</a></li> |
| <li><a href="Macro-Arguments.html#index-empty-macro-arguments-49">empty macro arguments</a>: <a href="Macro-Arguments.html#Macro-Arguments">Macro Arguments</a></li> |
| <li><a href="Environment-Variables.html#index-environment-variables-198">environment variables</a>: <a href="Environment-Variables.html#Environment-Variables">Environment Variables</a></li> |
| <li><a href="Argument-Prescan.html#index-expansion-of-arguments-79">expansion of arguments</a>: <a href="Argument-Prescan.html#Argument-Prescan">Argument Prescan</a></li> |
| <li><a href="GNU-Free-Documentation-License.html#index-FDL_002c-GNU-Free-Documentation-License-207">FDL, GNU Free Documentation License</a>: <a href="GNU-Free-Documentation-License.html#GNU-Free-Documentation-License">GNU Free Documentation License</a></li> |
| <li><a href="Function_002dlike-Macros.html#index-function_002dlike-macros-45">function-like macros</a>: <a href="Function_002dlike-Macros.html#Function_002dlike-Macros">Function-like Macros</a></li> |
| <li><a href="Invocation.html#index-grouping-options-120">grouping options</a>: <a href="Invocation.html#Invocation">Invocation</a></li> |
| <li><a href="Once_002dOnly-Headers.html#index-guard-macro-32">guard macro</a>: <a href="Once_002dOnly-Headers.html#Once_002dOnly-Headers">Once-Only Headers</a></li> |
| <li><a href="Header-Files.html#index-header-file-25">header file</a>: <a href="Header-Files.html#Header-Files">Header Files</a></li> |
| <li><a href="Tokenization.html#index-header-file-names-16">header file names</a>: <a href="Tokenization.html#Tokenization">Tokenization</a></li> |
| <li><a href="Tokenization.html#index-identifiers-10">identifiers</a>: <a href="Tokenization.html#Tokenization">Tokenization</a></li> |
| <li><a href="Implementation-limits.html#index-implementation-limits-110">implementation limits</a>: <a href="Implementation-limits.html#Implementation-limits">Implementation limits</a></li> |
| <li><a href="Implementation_002ddefined-behavior.html#index-implementation_002ddefined-behavior-109">implementation-defined behavior</a>: <a href="Implementation_002ddefined-behavior.html#Implementation_002ddefined-behavior">Implementation-defined behavior</a></li> |
| <li><a href="Once_002dOnly-Headers.html#index-including-just-once-29">including just once</a>: <a href="Once_002dOnly-Headers.html#Once_002dOnly-Headers">Once-Only Headers</a></li> |
| <li><a href="Invocation.html#index-invocation-118">invocation</a>: <a href="Invocation.html#Invocation">Invocation</a></li> |
| <li><a href="C_002b_002b-Named-Operators.html#index-iso646_002eh-67">iso646.h</a>: <a href="C_002b_002b-Named-Operators.html#C_002b_002b-Named-Operators">C++ Named Operators</a></li> |
| <li><a href="Initial-processing.html#index-line-comments-6">line comments</a>: <a href="Initial-processing.html#Initial-processing">Initial processing</a></li> |
| <li><a href="Line-Control.html#index-line-control-98">line control</a>: <a href="Line-Control.html#Line-Control">Line Control</a></li> |
| <li><a href="Initial-processing.html#index-line-endings-1">line endings</a>: <a href="Initial-processing.html#Initial-processing">Initial processing</a></li> |
| <li><a href="Preprocessor-Output.html#index-linemarkers-108">linemarkers</a>: <a href="Preprocessor-Output.html#Preprocessor-Output">Preprocessor Output</a></li> |
| <li><a href="Argument-Prescan.html#index-macro-argument-expansion-80">macro argument expansion</a>: <a href="Argument-Prescan.html#Argument-Prescan">Argument Prescan</a></li> |
| <li><a href="Directives-Within-Macro-Arguments.html#index-macro-arguments-and-directives-71">macro arguments and directives</a>: <a href="Directives-Within-Macro-Arguments.html#Directives-Within-Macro-Arguments">Directives Within Macro Arguments</a></li> |
| <li><a href="Computed-Includes.html#index-macros-in-include-35">macros in include</a>: <a href="Computed-Includes.html#Computed-Includes">Computed Includes</a></li> |
| <li><a href="Macro-Arguments.html#index-macros-with-arguments-47">macros with arguments</a>: <a href="Macro-Arguments.html#Macro-Arguments">Macro Arguments</a></li> |
| <li><a href="Variadic-Macros.html#index-macros-with-variable-arguments-57">macros with variable arguments</a>: <a href="Variadic-Macros.html#Variadic-Macros">Variadic Macros</a></li> |
| <li><a href="Invocation.html#index-make-142">make</a>: <a href="Invocation.html#Invocation">Invocation</a></li> |
| <li><a href="Object_002dlike-Macros.html#index-manifest-constants-43">manifest constants</a>: <a href="Object_002dlike-Macros.html#Object_002dlike-Macros">Object-like Macros</a></li> |
| <li><a href="C_002b_002b-Named-Operators.html#index-named-operators-65">named operators</a>: <a href="C_002b_002b-Named-Operators.html#C_002b_002b-Named-Operators">C++ Named Operators</a></li> |
| <li><a href="Newlines-in-Arguments.html#index-newlines-in-macro-arguments-82">newlines in macro arguments</a>: <a href="Newlines-in-Arguments.html#Newlines-in-Arguments">Newlines in Arguments</a></li> |
| <li><a href="Other-Directives.html#index-null-directive-106">null directive</a>: <a href="Other-Directives.html#Other-Directives">Other Directives</a></li> |
| <li><a href="Tokenization.html#index-numbers-11">numbers</a>: <a href="Tokenization.html#Tokenization">Tokenization</a></li> |
| <li><a href="Object_002dlike-Macros.html#index-object_002dlike-macro-41">object-like macro</a>: <a href="Object_002dlike-Macros.html#Object_002dlike-Macros">Object-like Macros</a></li> |
| <li><a href="Invocation.html#index-options-122">options</a>: <a href="Invocation.html#Invocation">Invocation</a></li> |
| <li><a href="Invocation.html#index-options_002c-grouping-121">options, grouping</a>: <a href="Invocation.html#Invocation">Invocation</a></li> |
| <li><a href="Tokenization.html#index-other-tokens-20">other tokens</a>: <a href="Tokenization.html#Tokenization">Tokenization</a></li> |
| <li><a href="Preprocessor-Output.html#index-output-format-107">output format</a>: <a href="Preprocessor-Output.html#Preprocessor-Output">Preprocessor Output</a></li> |
| <li><a href="Wrapper-Headers.html#index-overriding-a-header-file-37">overriding a header file</a>: <a href="Wrapper-Headers.html#Wrapper-Headers">Wrapper Headers</a></li> |
| <li><a href="Operator-Precedence-Problems.html#index-parentheses-in-macro-bodies-74">parentheses in macro bodies</a>: <a href="Operator-Precedence-Problems.html#Operator-Precedence-Problems">Operator Precedence Problems</a></li> |
| <li><a href="Macro-Pitfalls.html#index-pitfalls-of-macros-73">pitfalls of macros</a>: <a href="Macro-Pitfalls.html#Macro-Pitfalls">Macro Pitfalls</a></li> |
| <li><a href="Predefined-Macros.html#index-predefined-macros-59">predefined macros</a>: <a href="Predefined-Macros.html#Predefined-Macros">Predefined Macros</a></li> |
| <li><a href="System_002dspecific-Predefined-Macros.html#index-predefined-macros_002c-system_002dspecific-63">predefined macros, system-specific</a>: <a href="System_002dspecific-Predefined-Macros.html#System_002dspecific-Predefined-Macros">System-specific Predefined Macros</a></li> |
| <li><a href="Obsolete-Features.html#index-predicates-112">predicates</a>: <a href="Obsolete-Features.html#Obsolete-Features">Obsolete Features</a></li> |
| <li><a href="The-preprocessing-language.html#index-preprocessing-directives-22">preprocessing directives</a>: <a href="The-preprocessing-language.html#The-preprocessing-language">The preprocessing language</a></li> |
| <li><a href="Tokenization.html#index-preprocessing-numbers-12">preprocessing numbers</a>: <a href="Tokenization.html#Tokenization">Tokenization</a></li> |
| <li><a href="Tokenization.html#index-preprocessing-tokens-9">preprocessing tokens</a>: <a href="Tokenization.html#Tokenization">Tokenization</a></li> |
| <li><a href="Argument-Prescan.html#index-prescan-of-macro-arguments-81">prescan of macro arguments</a>: <a href="Argument-Prescan.html#Argument-Prescan">Argument Prescan</a></li> |
| <li><a href="Macro-Pitfalls.html#index-problems-with-macros-72">problems with macros</a>: <a href="Macro-Pitfalls.html#Macro-Pitfalls">Macro Pitfalls</a></li> |
| <li><a href="Tokenization.html#index-punctuators-17">punctuators</a>: <a href="Tokenization.html#Tokenization">Tokenization</a></li> |
| <li><a href="Undefining-and-Redefining-Macros.html#index-redefining-macros-69">redefining macros</a>: <a href="Undefining-and-Redefining-Macros.html#Undefining-and-Redefining-Macros">Undefining and Redefining Macros</a></li> |
| <li><a href="Once_002dOnly-Headers.html#index-repeated-inclusion-28">repeated inclusion</a>: <a href="Once_002dOnly-Headers.html#Once_002dOnly-Headers">Once-Only Headers</a></li> |
| <li><a href="Diagnostics.html#index-reporting-errors-94">reporting errors</a>: <a href="Diagnostics.html#Diagnostics">Diagnostics</a></li> |
| <li><a href="Diagnostics.html#index-reporting-warnings-95">reporting warnings</a>: <a href="Diagnostics.html#Diagnostics">Diagnostics</a></li> |
| <li><a href="System_002dspecific-Predefined-Macros.html#index-reserved-namespace-64">reserved namespace</a>: <a href="System_002dspecific-Predefined-Macros.html#System_002dspecific-Predefined-Macros">System-specific Predefined Macros</a></li> |
| <li><a href="Self_002dReferential-Macros.html#index-self_002dreference-78">self-reference</a>: <a href="Self_002dReferential-Macros.html#Self_002dReferential-Macros">Self-Referential Macros</a></li> |
| <li><a href="Swallowing-the-Semicolon.html#index-semicolons-_0028after-macro-calls_0029-75">semicolons (after macro calls)</a>: <a href="Swallowing-the-Semicolon.html#Swallowing-the-Semicolon">Swallowing the Semicolon</a></li> |
| <li><a href="Duplication-of-Side-Effects.html#index-side-effects-_0028in-macro-arguments_0029-76">side effects (in macro arguments)</a>: <a href="Duplication-of-Side-Effects.html#Duplication-of-Side-Effects">Duplication of Side Effects</a></li> |
| <li><a href="Standard-Predefined-Macros.html#index-standard-predefined-macros_002e-60">standard predefined macros.</a>: <a href="Standard-Predefined-Macros.html#Standard-Predefined-Macros">Standard Predefined Macros</a></li> |
| <li><a href="Tokenization.html#index-string-constants-14">string constants</a>: <a href="Tokenization.html#Tokenization">Tokenization</a></li> |
| <li><a href="Tokenization.html#index-string-literals-13">string literals</a>: <a href="Tokenization.html#Tokenization">Tokenization</a></li> |
| <li><a href="Stringification.html#index-stringification-50">stringification</a>: <a href="Stringification.html#Stringification">Stringification</a></li> |
| <li><a href="Object_002dlike-Macros.html#index-symbolic-constants-42">symbolic constants</a>: <a href="Object_002dlike-Macros.html#Object_002dlike-Macros">Object-like Macros</a></li> |
| <li><a href="System-Headers.html#index-system-header-files-39">system header files</a>: <a href="System-Headers.html#System-Headers">System Headers</a></li> |
| <li><a href="Header-Files.html#index-system-header-files-26">system header files</a>: <a href="Header-Files.html#Header-Files">Header Files</a></li> |
| <li><a href="System_002dspecific-Predefined-Macros.html#index-system_002dspecific-predefined-macros-62">system-specific predefined macros</a>: <a href="System_002dspecific-Predefined-Macros.html#System_002dspecific-Predefined-Macros">System-specific Predefined Macros</a></li> |
| <li><a href="Obsolete-Features.html#index-testing-predicates-113">testing predicates</a>: <a href="Obsolete-Features.html#Obsolete-Features">Obsolete Features</a></li> |
| <li><a href="Concatenation.html#index-token-concatenation-54">token concatenation</a>: <a href="Concatenation.html#Concatenation">Concatenation</a></li> |
| <li><a href="Concatenation.html#index-token-pasting-53">token pasting</a>: <a href="Concatenation.html#Concatenation">Concatenation</a></li> |
| <li><a href="Tokenization.html#index-tokens-8">tokens</a>: <a href="Tokenization.html#Tokenization">Tokenization</a></li> |
| <li><a href="Initial-processing.html#index-trigraphs-2">trigraphs</a>: <a href="Initial-processing.html#Initial-processing">Initial processing</a></li> |
| <li><a href="Undefining-and-Redefining-Macros.html#index-undefining-macros-68">undefining macros</a>: <a href="Undefining-and-Redefining-Macros.html#Undefining-and-Redefining-Macros">Undefining and Redefining Macros</a></li> |
| <li><a href="Duplication-of-Side-Effects.html#index-unsafe-macros-77">unsafe macros</a>: <a href="Duplication-of-Side-Effects.html#Duplication-of-Side-Effects">Duplication of Side Effects</a></li> |
| <li><a href="Variadic-Macros.html#index-variable-number-of-arguments-56">variable number of arguments</a>: <a href="Variadic-Macros.html#Variadic-Macros">Variadic Macros</a></li> |
| <li><a href="Variadic-Macros.html#index-variadic-macros-58">variadic macros</a>: <a href="Variadic-Macros.html#Variadic-Macros">Variadic Macros</a></li> |
| <li><a href="Once_002dOnly-Headers.html#index-wrapper-_0040code_007b_0023ifndef_007d-30">wrapper <code>#ifndef</code></a>: <a href="Once_002dOnly-Headers.html#Once_002dOnly-Headers">Once-Only Headers</a></li> |
| <li><a href="Wrapper-Headers.html#index-wrapper-headers-36">wrapper headers</a>: <a href="Wrapper-Headers.html#Wrapper-Headers">Wrapper Headers</a></li> |
| </ul></body></html> |
| |