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<title>Chapter 24. Boost.Metaparse</title>
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<div><h2 class="title">
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<a name="metaparse"></a>Chapter 24. Boost.Metaparse</h2></div>
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<div><div class="author"><h3 class="author">
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<span class="firstname">Abel</span> <span class="surname">Sinkovics</span>
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</h3></div></div>
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<div><p class="copyright">Copyright © 2015 Abel Sinkovics</p></div>
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<div><div class="legalnotice">
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<a name="metaparse.legal"></a><p>
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
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<div class="toc">
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<p><b>Table of Contents</b></p>
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<dl class="toc">
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<dt><span class="section"><a href="metaparse.html#metaparse.description">Description</a></span></dt>
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<dt><span class="section"><a href="metaparse/related_publications_and_blogs.html">Related publications
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and blogs</a></span></dt>
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<dt><span class="section"><a href="metaparse/preface.html">Preface</a></span></dt>
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<dd><dl>
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<dt><span class="section"><a href="metaparse/preface.html#metaparse.preface.description">Description</a></span></dt>
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<dt><span class="section"><a href="metaparse/preface.html#metaparse.preface.scope">Scope</a></span></dt>
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<dt><span class="section"><a href="metaparse/preface.html#metaparse.preface.advantages_of_using_this_library">Advantages
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of using this library</a></span></dt>
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<dt><span class="section"><a href="metaparse/preface.html#metaparse.preface.cost_of_using_metaparse">Cost of using
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Metaparse</a></span></dt>
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<dt><span class="section"><a href="metaparse/preface.html#metaparse.preface.supported_platforms">Supported platforms</a></span></dt>
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</dl></dd>
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<dt><span class="section"><a href="metaparse/getting_started_with_boost_metap.html">Getting
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started with Boost.Metaparse</a></span></dt>
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<dd><dl>
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<dt><span class="section"><a href="metaparse/getting_started_with_boost_metap.html#metaparse.getting_started_with_boost_metap.1_introduction">1.
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Introduction</a></span></dt>
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<dt><span class="section"><a href="metaparse/getting_started_with_boost_metap.html#metaparse.getting_started_with_boost_metap.2_the_text_to_parse">2.
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The text to parse</a></span></dt>
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<dt><span class="section"><a href="metaparse/getting_started_with_boost_metap.html#metaparse.getting_started_with_boost_metap.3_creating_a_simple_parser">3.
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Creating a simple parser</a></span></dt>
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<dt><span class="section"><a href="metaparse/getting_started_with_boost_metap.html#metaparse.getting_started_with_boost_metap.4_parsing_simple_expressions">4.
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Parsing simple expressions</a></span></dt>
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<dt><span class="section"><a href="metaparse/getting_started_with_boost_metap.html#metaparse.getting_started_with_boost_metap.5_parsing_longer_expressions">5.
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Parsing longer expressions</a></span></dt>
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<dt><span class="section"><a href="metaparse/getting_started_with_boost_metap.html#metaparse.getting_started_with_boost_metap.6_adding_support_for_other_opera">6.
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Adding support for other operators</a></span></dt>
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<dt><span class="section"><a href="metaparse/getting_started_with_boost_metap.html#metaparse.getting_started_with_boost_metap.7_dealing_with_precedence">7.
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Dealing with precedence</a></span></dt>
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<dt><span class="section"><a href="metaparse/getting_started_with_boost_metap.html#metaparse.getting_started_with_boost_metap.8_dealing_with_associativity">8.
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Dealing with associativity</a></span></dt>
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<dt><span class="section"><a href="metaparse/getting_started_with_boost_metap.html#metaparse.getting_started_with_boost_metap.9_dealing_with_unary_operators">9.
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Dealing with unary operators</a></span></dt>
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<dt><span class="section"><a href="metaparse/getting_started_with_boost_metap.html#metaparse.getting_started_with_boost_metap.10_dealing_with_parens">10.
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Dealing with parens</a></span></dt>
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<dt><span class="section"><a href="metaparse/getting_started_with_boost_metap.html#metaparse.getting_started_with_boost_metap.11_dealing_with_invalid_input">11.
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Dealing with invalid input</a></span></dt>
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<dt><span class="section"><a href="metaparse/getting_started_with_boost_metap.html#metaparse.getting_started_with_boost_metap.12_summary">12.
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Summary</a></span></dt>
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<dt><span class="section"><a href="metaparse/getting_started_with_boost_metap.html#metaparse.getting_started_with_boost_metap.copy_paste_friendly_code_example">Copy-paste
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friendly code examples</a></span></dt>
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<dt><span class="section"><a href="metaparse/getting_started_with_boost_metap.html#metaparse.getting_started_with_boost_metap.definitions_before_each_section">Definitions
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before each section</a></span></dt>
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</dl></dd>
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<dt><span class="section"><a href="metaparse/user_manual.html">User manual</a></span></dt>
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<dd><dl>
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<dt><span class="section"><a href="metaparse/user_manual.html#metaparse.user_manual.what_is_a_parser">What is a parser</a></span></dt>
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<dt><span class="section"><a href="metaparse/user_manual.html#metaparse.user_manual.parsing_based_on_constexpr">Parsing
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based on <code class="computeroutput"><span class="keyword">constexpr</span></code></a></span></dt>
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<dt><span class="section"><a href="metaparse/user_manual.html#metaparse.user_manual.what_types_of_grammars_can_be_us">What
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types of grammars can be used?</a></span></dt>
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</dl></dd>
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<dt><span class="section"><a href="metaparse/versioning.html">Versioning</a></span></dt>
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<dd><dl>
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<dt><span class="section"><a href="metaparse/versioning.html#metaparse.versioning.template_classes">Template classes</a></span></dt>
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<dt><span class="section"><a href="metaparse/versioning.html#metaparse.versioning.macros">Macros</a></span></dt>
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</dl></dd>
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<dt><span class="section"><a href="metaparse/performance.html">Performance</a></span></dt>
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<dd><dl>
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<dt><span class="section"><a href="metaparse/performance.html#metaparse.performance.benchmarks_of_boost_metaparse_st">Benchmarks
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of BOOST_METAPARSE_STRING</a></span></dt>
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<dt><span class="section"><a href="metaparse/performance.html#metaparse.performance.measuring_printf">Measuring printf</a></span></dt>
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<dt><span class="section"><a href="metaparse/performance.html#metaparse.performance.further_measurements">Further measurements</a></span></dt>
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</dl></dd>
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<dt><span class="section"><a href="metaparse/the_design_of_the_library.html">The design of the
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library</a></span></dt>
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<dd><dl><dt><span class="section"><a href="metaparse/the_design_of_the_library.html#metaparse.the_design_of_the_library.design_rationale">Design
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rationale</a></span></dt></dl></dd>
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<dt><span class="section"><a href="metaparse/reference.html">Reference</a></span></dt>
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<dd><dl>
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<dt><span class="section"><a href="metaparse/reference.html#metaparse.reference.parsers_and_combinators_provided">Parsers
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and combinators provided by the library</a></span></dt>
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<dt><span class="section"><a href="metaparse/reference.html#metaparse.reference.compile_time_data_structures_and">Compile-time
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data structures and values</a></span></dt>
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<dt><span class="section"><a href="metaparse/reference.html#metaparse.reference.string">String</a></span></dt>
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<dt><span class="section"><a href="metaparse/reference.html#metaparse.reference.errors">Errors</a></span></dt>
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<dt><span class="section"><a href="metaparse/reference.html#metaparse.reference.tags">Tags</a></span></dt>
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<dt><span class="section"><a href="metaparse/reference.html#metaparse.reference.utilities">Utilities</a></span></dt>
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<dt><span class="section"><a href="metaparse/reference.html#metaparse.reference.terms_used_by_the_library">Terms
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used by the library</a></span></dt>
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<dt><span class="section"><a href="metaparse/reference.html#metaparse.reference.alphabetical">Alphabetical</a></span></dt>
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</dl></dd>
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</dl>
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</div>
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<div class="section">
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<div class="titlepage"><div><div><h2 class="title" style="clear: both">
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<a name="metaparse.description"></a><a class="link" href="metaparse.html#metaparse.description" title="Description">Description</a>
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</h2></div></div></div>
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<p>
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Metaparse is a parser generator library for template metaprograms. The purpose
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of this library is to support the creation of parsers that parse at compile
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time. This library is intended to be used for embedded domain specific language
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creation for C++. The input of the generated parser is a compile time string,
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see <a class="link" href="metaparse/reference.html#string"><code class="computeroutput"><span class="identifier">string</span></code></a>.
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The result of the parsing process is either an error or any other result the
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writer of the parser specifies.
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</p>
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<p>
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The library is similar to Boost.Spirit, however while parsers built with Spirit
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parse at run-time, parsers built with Metaparse parse at compile-time. Parsers
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built with Metaparse can output:
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</p>
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<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
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<li class="listitem">
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types
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</li>
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<li class="listitem">
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constant values
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</li>
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<li class="listitem">
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objects (types with public static members)
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</li>
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<li class="listitem">
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callable C++ functions (types with public static method)
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</li>
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<li class="listitem">
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template metafunction classes
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</li>
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</ul></div>
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<p>
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See section <a class="link" href="metaparse/user_manual.html#result_types">What can be built from a compile-time
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string?</a> for further details.
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</p>
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<p>
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Based on C++11 features the library can provide advanced utilities for defining
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the input string, the rest of the library works on C++98-based compilers as
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well. Note that if you build the tests and examples with Boost.Build using
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GCC or Clang, the compiler will not have C++11 (or newer) enabled. To build
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the tests and examples in C++11-mode, you need to run <code class="computeroutput"><span class="identifier">b2</span>
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<span class="identifier">cxxflags</span><span class="special">=</span><span class="string">"-std=c++11"</span></code>.
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</p>
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<p>
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An external tutorial can be found at <a href="https://github.com/sabel83/metaparse_tutorial#metaparse-tutorial" target="_top">https://github.com/sabel83/metaparse_tutorial#metaparse-tutorial</a>
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</p>
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</div>
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</div>
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<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
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<td align="left"><p><small>Last revised: April 13, 2021 at 16:32:33 GMT</small></p></td>
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<td align="right"><div class="copyright-footer"></div></td>
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