gcc/libstdc++-v3/doc/html/manual/bk01pt03ch08.html - Issue 3050029: [gcc] GCC 4.5.0=>4.5.1

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Issue 3050029: [gcc] GCC 4.5.0=>4.5.1 (Closed) Base URL: ssh://git@gitrw.chromium.org:9222/nacl-toolchain.git

Patch Set: Created 10 years, 5 months ago

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-<html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>Chapter 8. Concept Checking</title><meta name="generator" content="DocBook XSL Stylesheets V1.74.0" /><meta name="keywords" content="
 ISO C++
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 library
 " /><link rel="home" href="../spine.html" title="The GNU C++ Library Documentation" /><link rel="up" href="diagnostics.html" title="Part III. Diagnostics" /><link rel="prev" href="bk01pt03ch07s03.html" title="Cancellation" /><link rel="next" href="utilities.html" title="Part IV. Utilities" /></head><body><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">Chapter 8. Concept Checking</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="bk01pt03ch07s03.html">Prev</a> </td><th width="60%" align="center">Part III.

- Diagnostics

-</th><td width="20%" align="right"> <a accesskey="n" href="utilities.html">Next</a></td></tr></table><hr /></div><div class="chapter" lang="en" xml:lang="en"><div class="titlepage"><div><div><h2 class="title"><a id="manual.diagnostics.concept_checking"></a>Chapter 8. Concept Checking</h2></div></div></div><p>

- In 1999, SGI added “<span class="quote">concept checkers</span>” to their

- implementation of the STL: code which checked the template

- parameters of instantiated pieces of the STL, in order to insure

- that the parameters being used met the requirements of the

- standard. For example, the Standard requires that types passed as

- template parameters to <code class="classname">vector</code> be

- "Assignable" (which means what you think it means). The

- checking was done during compilation, and none of the code was

- executed at runtime.

- </p><p>

- Unfortunately, the size of the compiler files grew significantly

- as a result. The checking code itself was cumbersome. And bugs

- were found in it on more than one occasion.

- </p><p>

- The primary author of the checking code, Jeremy Siek, had already

- started work on a replacement implementation. The new code has been

- formally reviewed and accepted into

- <a class="ulink" href="http://www.boost.org/libs/concept_check/concept_check.htm" target="_top">the

- Boost libraries</a>, and we are pleased to incorporate it into the

- GNU C++ library.

- </p><p>

- The new version imposes a much smaller space overhead on the generated

- object file. The checks are also cleaner and easier to read and

- understand.

- </p><p>

- They are off by default for all versions of GCC.

- They can be enabled at configure time with

- <a class="ulink" href="../configopts.html" target="_top"><code class="literal">--enable-concept-checks</code></a>.

- You can enable them on a per-translation-unit basis with

- <code class="literal">-D_GLIBCXX_CONCEPT_CHECKS</code>.

- </p><p>

- Please note that the upcoming C++ standard has first-class

- support for template parameter constraints based on concepts in the core

- language. This will obviate the need for the library-simulated concept

- checking described above.

- </p></div><div class="navfooter"><hr /><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="bk01pt03ch07s03.html">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="diagnostics.html">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="utilities.html">Next</a></td></tr><tr><td width="40%" align="left" valign="top">Cancellation </td><td width="20%" align="center"><a accesskey="h" href="../spine.html">Home</a></td><td width="40%" align="right" valign="top"> Part IV.

- Utilities

-</td></tr></table></div></body></html>

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