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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2//EN">
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<html>
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<head>
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<title>Integer Type Selection Templates</title>
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</head>
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<body bgcolor="white" text="black">
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2002-02-04 18:55:31 +00:00
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<h1>
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<img src="../../boost.png" alt="boost.png (6897 bytes)"
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align="middle" width="277" height="86">Integer Type Selection
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Templates</h1>
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<p>The <cite><a
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href="../../boost/integer.hpp"><boost/integer.hpp></a></cite> type
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selection templates allow integer types to be selected based on desired
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characteristics such as number of bits or maximum value. This facility
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is particularly useful for solving generic programming problems.</p>
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<h2><a name="contents">Contents</a></h2>
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<ul>
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<li><a href="#contents">Contents</a></li>
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<li><a href="#synopsis">Synopsis</a></li>
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<li><a href="#easy">Processor-Optimized Types</a></li>
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<li><a href="#sized">Sized Types</a></li>
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<li><a href="#mpl">MPL-Compatible Variants</a></li>
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<li><a href="#example">Example</a></li>
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<li><a href="#demo">Demonstration Program</a></li>
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<li><a href="#rationale">Rationale</a></li>
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<li><a href="#alternative">Alternative</a></li>
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<li><a href="#credits">Credits</a></li>
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</ul>
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2001-12-03 03:29:57 +00:00
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<h2><a name="synopsis">Synopsis</a></h2>
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<blockquote><pre>
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#include <<a href="../../boost/integer_fwd.hpp">boost/integer_fwd.hpp</a>> // forwarding header
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#include <<a href="cstdint.htm">boost/cstdint.hpp</a>> // for boost::uintmax_t, intmax_t
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namespace boost
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{
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// fast integers from least integers
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template< typename LeastInt >
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struct int_fast_t
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{
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typedef <em>implementation_supplied</em> fast;
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};
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// signed
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template< int Bits >
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struct int_t
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{
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typedef <em>implementation_supplied</em> least;
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typedef int_fast_t<least>::fast fast;
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};
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template< int Bits >
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struct int_exact_t
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{
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typedef <em>implementation_supplied</em> exact;
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};
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// unsigned
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template< int Bits >
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struct uint_t
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{
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typedef <em>implementation_supplied</em> least;
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typedef int_fast_t<least>::fast fast;
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};
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template< int Bits >
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struct uint_exact_t
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{
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typedef <em>implementation_supplied</em> exact;
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};
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// signed
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template< intmax_t MaxValue >
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struct int_max_value_t
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{
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typedef <em>implementation_supplied</em> least;
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typedef int_fast_t<least>::fast fast;
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};
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template< intmax_t MinValue >
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struct int_min_value_t
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{
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typedef <em>implementation_supplied</em> least;
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typedef int_fast_t<least>::fast fast;
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};
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// unsigned
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template< uintmax_t Value >
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struct uint_value_t
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{
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typedef <em>implementation_supplied</em> least;
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typedef int_fast_t<least>::fast fast;
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};
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// MPL-compatible
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template< int Bits, typename Signedness >
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struct exact_integral
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{
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static bool const is_specialized = <em>implementation_supplied</em>;
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static bool const is_signed = <em>implementation_supplied</em>;
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static int const bit_count = Bits;
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typedef <em>implementation_supplied</em> type;
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};
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} // namespace boost
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</pre></blockquote>
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<h2><a name="easy">Processor-Optimized Types</a></h2>
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<p>The <code>int_fast_t</code> class template maps its input type to the
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next-largest type that the processor can manipulate the easiest, or to
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itself if the input type is already an easy-to-manipulate type. For
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instance, processing a bunch of <code>char</code> objects may go faster
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if they were converted to <code>int</code> objects before processing.
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The input type, passed as the only template parameter, must be a
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built-in integral type, except <code>bool</code>. Unsigned integral
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types can be used, as well as signed integral types, despite the name.
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The output type is given as the class member <code>fast</code>.</p>
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<p><strong>Implementation Notes</strong><br>
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By default, the output type is identical to the input type. Eventually,
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this code's implementation should be conditionalized for each platform
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to give accurate mappings between the built-in types and the
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easiest-to-manipulate built-in types. Also, there is no guarantee that
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the output type actually is easier to manipulate than the input
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type.</p>
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<h2><a name="sized">Sized Types</a></h2>
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<p>The <code>int_t</code>, <code>int_exact_t</code>, <code>uint_t</code>,
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<code>uint_exact_t</code>, <code>int_max_value_t</code>,
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<code>int_min_value_t</code>, and <code>uint_value_t</code> class templates find
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the most appropriate built-in integral type for the given template parameter.
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This type is given by the class member <code>least</code> or <code>exact</code>.
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For the non-exact class templates, the easiest-to-manipulate version of that
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type is given by the class member <code>fast</code>. The following table
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describes each template's criteria.</p>
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<table border="2" cellpadding="5">
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<caption>Criteria for the Sized Type Class Templates</caption>
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<tr>
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<th>Class Template (all in name-space <code>boost</code>)</th>
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<th>Template Parameter Mapping</th>
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</tr>
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<tr>
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<td><code>int_t</code></td>
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<td>The smallest built-in signed integral type with at least the
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given number of bits, including the sign bit. The parameter
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<em>must</em> be a positive number. A compile-time error results if
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the parameter is larger than the number of bits in a
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<code>boost::intmax_t</code>.</td>
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</tr>
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<tr>
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<td><code>int_exact_t</code></td>
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<td>The smallest built-in signed integral type with exactly the
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given number of bits, including the sign bit. A compile-time error
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results if no qualifying type exists.</td>
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</tr>
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<tr>
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<td><code>uint_t</code></td>
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<td>The smallest built-in unsigned integral type with at least
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the given number of bits. The parameter <em>must</em> be a
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non-negative number. A compile-time error results if the parameter
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is larger than the number of bits in a
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<code>boost::uintmax_t</code>.</td>
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</tr>
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<tr>
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<td><code>uint_exact_t</code></td>
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<td>The smallest built-in unsigned integral type with exactly the given
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number of bits. A compile-time error results if no qualifying type
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exists.</td>
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</tr>
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<tr>
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<td><code>int_max_value_t</code></td>
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<td>The smallest built-in signed integral type that supports the
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given value as a maximum. The parameter <em>must</em> be a
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positive number.</td>
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</tr>
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<tr>
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<td><code>int_min_value_t</code></td>
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<td>The smallest built-in signed integral type that supports the
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given value as a minimum. The parameter <em>must</em> be a
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negative number.</td>
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</tr>
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<tr>
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<td><code>uint_value_t</code></td>
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<td>The smallest built-in unsigned integral type that supports
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the given value as a maximum. The parameter should be a
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positive number.</td>
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</tr>
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</table>
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2008-07-15 09:59:19 +00:00
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<h2><a name="mpl">MPL-Compatible Variants</a></h2>
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<p>The bit-length sized-type class templates have several drawbacks:</p>
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<ul>
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<li>You must know the valid bit-lengths in advance.</li>
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<li>There is no way to inspect the parameter used after a size-type template
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class is aliased.</li>
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<li>Using an inappropriate parameter value results in a compiler
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diagnostic.</li>
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<li>The type names used are inconsistent with other transformations in
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Boost, like in <a href="../mpl/">MPL</a>.</li>
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<li>The above two facts make use of the size-type class templates
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incompatible with template meta-programming techniques.</li>
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</ul>
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<p>The <code>exact_integral</code> class template provides an MPL-compatible
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alternative. This alternative has the form:</p>
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<blockquote><pre>
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template< <var>SwitchType</var> <var>SwitchValue</var>, typename Signedness >
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struct <var>name</var>
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{
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static bool const is_specialized = <em>implementation_supplied</em>;
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static bool const is_signed = <em>implementation_supplied</em>;
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static <var>SwitchType</var> const <var>switch_id</var> = <var>SwitchValue</var>;
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typedef <em>implementation_supplied</em> type;
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};
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</pre></blockquote>
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<p>Each member, if present, is defined by:</p>
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<table border="2" cellpadding="5">
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<caption>Members in MPL-Compatible Class Templates</caption>
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<tr>
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<th>Class Template Member</th>
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<th>When Defined</th>
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<th>Meaning</th>
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</tr>
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<tr>
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<td><code>is_specialized</code></td>
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<td>Always</td>
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<td>Flag indicating when a particular template class instantiation is a
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valid meta-function (<code>true</code>) or not (<code>false</code>).</td>
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</tr>
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<tr>
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<td><code>is_signed</code></td>
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<td><code>is_specialized == true</code></td>
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<td>Flag indicating whether the signed-variant (<code>true</code>) or
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the unsigned-variant (<code>false</code>) of the meta-function is
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used. This is controlled by the <code>Signedness</code> template
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parameter:
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<table border="1" cellpadding="3" align="center">
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<caption>Effect of <code>Signedness</code> Setting</caption>
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<tr>
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<th><code>Signedness</code> Type</th>
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<th><code>is_signed</code></th>
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</tr>
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<tr>
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<td><code>signed</code></td>
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<td><code>true</code></td>
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</tr>
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<tr>
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<td><code>unsigned</code></td>
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<td><code>false</code></td>
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</tr>
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<tr>
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<td>anything else</td>
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<td><em>not defined</em></td>
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</tr>
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</table>
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The type used is a programmer mnemonic; the compiler cannot prevent
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someone from using <code>int</code> or <code>signed int</code>
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instead of <code>signed</code>, or <code>unsigned int</code> instead
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of <code>unsigned</code>.</td>
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</tr>
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<tr>
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<td><code><var>switch_id</var></code> (Actual name is template-specific.)</td>
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<td>Always</td>
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<td>The value of the main control parameter, accessible even if the
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template class instantiation is aliased.</td>
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</tr>
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<tr>
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<td><code>type</code></td>
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<td><code>is_specialized == true</code></td>
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<td>The meta-function's result. It appears only if the input parameters
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satisfy the template's requirements. It's presence, or lack thereof,
|
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enables "Substitution Failure Is Not An Error" (SFINAE)
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techniques, instead of a hard compiler diagnostic.</td>
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</tr>
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</table>
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<p>The following table describes each template's criteria. The classic signed
|
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and unsigned equivalents are the sized-type class templates that each
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MPL-compatible class template emulates. (The setting of <var>Signedness</var>
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controls the appropriate emulation.)</p>
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<table border="2" cellpadding="5">
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<caption>Criteria for the MPL-Compatible Class Templates</caption>
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<tr>
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<th rowspan="2">Class Template (all in name-space <code>boost</code>)</th>
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<th rowspan="2">Parameter Type</th>
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<th rowspan="2">Parameter Member ID</th>
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<th colspan="2">Classic Equivalent</th>
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<th rowspan="2">Template Parameter Mapping (when <code>type</code> is defined)</th>
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</tr>
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<tr>
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<th>Signed</th>
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|
<th>Unsigned</th>
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</tr>
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<tr>
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|
<td><code>exact_integral</code></td>
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<td><code>int</code></td>
|
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|
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<td><code>bit_count</code></td>
|
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<td><code>int_exact_t</code></td>
|
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<td><code>uint_exact_t</code></td>
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<td>The smallest built-in integral type with exactly <code>bit_count</code>
|
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|
|
|
bits (including the sign bit when <var>Signedness</var> is
|
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|
<code>signed</code>). Not present if no type qualifies.</td>
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</tr>
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</table>
|
|
|
|
|
|
2001-12-03 03:29:57 +00:00
|
|
|
<h2><a name="example">Example</a></h2>
|
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|
|
|
|
2008-07-15 09:59:19 +00:00
|
|
|
<blockquote><pre>
|
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|
|
#include <<a href="../../boost/integer.hpp">boost/integer.hpp</a>>
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|
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#include <<a href="../../boost/mpl/int.hpp">boost/mpl/int.hpp</a>>
|
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#include <iostream>
|
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|
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#include <ostream>
|
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|
|
|
|
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|
|
//...
|
|
|
|
|
|
|
|
|
|
template < int Bits >
|
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|
|
|
bool
|
|
|
|
|
fit_exactly( boost::mpl::int_<Bits> const &x,
|
|
|
|
|
typename boost::exact_integral<Bits, signed>::type *unused = 0 )
|
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|
|
|
{
|
|
|
|
|
return true;
|
|
|
|
|
}
|
|
|
|
|
|
|
|
|
|
template < typename T >
|
|
|
|
|
bool
|
|
|
|
|
fit_exactly( T const &x )
|
|
|
|
|
{
|
|
|
|
|
return false;
|
|
|
|
|
}
|
2001-12-03 03:29:57 +00:00
|
|
|
|
|
|
|
|
//...
|
|
|
|
|
|
|
|
|
|
int main()
|
|
|
|
|
{
|
2008-07-15 09:59:19 +00:00
|
|
|
typedef boost::mpl::int_<24> twenty_four;
|
|
|
|
|
|
|
|
|
|
boost::int_t<twenty_four::value>::least my_var;
|
|
|
|
|
|
|
|
|
|
//...
|
|
|
|
|
|
|
|
|
|
std::cout << "my_var " << ( fit_exactly(twenty_four()) ? "does" :
|
|
|
|
|
"does not" ) << " fit its type exactly." << std::endl;
|
|
|
|
|
|
2001-12-03 03:29:57 +00:00
|
|
|
//...
|
|
|
|
|
}
|
|
|
|
|
</pre></blockquote>
|
2000-07-27 14:04:40 +00:00
|
|
|
|
2001-12-03 03:29:57 +00:00
|
|
|
<h2><a name="demo">Demonstration Program</a></h2>
|
2000-07-27 14:04:40 +00:00
|
|
|
|
2001-12-03 03:29:57 +00:00
|
|
|
<p>The program <a href="integer_test.cpp">integer_test.cpp</a> is a
|
|
|
|
|
simplistic demonstration of the results from instantiating various
|
|
|
|
|
examples of the sized type class templates.</p>
|
2000-07-27 14:04:40 +00:00
|
|
|
|
2001-12-03 03:29:57 +00:00
|
|
|
<h2><a name="rationale">Rationale</a></h2>
|
2000-07-27 14:04:40 +00:00
|
|
|
|
|
|
|
|
<p>The rationale for the design of the templates in this header includes:</p>
|
|
|
|
|
|
|
|
|
|
<ul>
|
2001-12-03 03:29:57 +00:00
|
|
|
<li>Avoid recursion because of concern about C++'s limited
|
|
|
|
|
guaranteed recursion depth (17).</li>
|
|
|
|
|
<li>Avoid macros on general principles.</li>
|
|
|
|
|
<li>Try to keep the design as simple as possible.</li>
|
2000-07-27 14:04:40 +00:00
|
|
|
</ul>
|
|
|
|
|
|
2001-12-03 03:29:57 +00:00
|
|
|
<h2><a name="alternative">Alternative</a></h2>
|
2000-07-27 14:04:40 +00:00
|
|
|
|
2001-12-03 03:29:57 +00:00
|
|
|
<p>If the number of bits required is known beforehand, it may be more
|
|
|
|
|
appropriate to use the types supplied in <cite><a
|
|
|
|
|
href="../../boost/cstdint.hpp"><boost/cstdint.hpp></a></cite>.</p>
|
2000-07-27 14:04:40 +00:00
|
|
|
|
2001-12-03 03:29:57 +00:00
|
|
|
<h2><a name="credits">Credits</a></h2>
|
2000-07-27 14:04:40 +00:00
|
|
|
|
2001-12-03 03:29:57 +00:00
|
|
|
<p>The author of most of the Boost integer type choosing templates is <a
|
2008-02-10 14:56:22 +00:00
|
|
|
href="http://www.boost.org/people/beman_dawes.html">Beman Dawes</a>. He gives thanks
|
2002-02-04 18:55:31 +00:00
|
|
|
to Valentin Bonnard and
|
2008-02-10 14:56:22 +00:00
|
|
|
<a href="http://www.boost.org/people/kevlin_henney.htm"> Kevlin Henney</a> for sharing
|
2001-12-03 03:29:57 +00:00
|
|
|
their designs for similar templates. <a
|
2008-02-10 14:56:22 +00:00
|
|
|
href="http://www.boost.org/people/daryle_walker.html">Daryle Walker</a> designed the
|
2008-07-15 09:59:19 +00:00
|
|
|
exact and value-based sized templates, and the MPL-compatible templates.</p>
|
2000-07-27 14:04:40 +00:00
|
|
|
|
2001-12-03 03:29:57 +00:00
|
|
|
<hr>
|
2000-07-27 14:04:40 +00:00
|
|
|
|
2008-07-15 09:59:19 +00:00
|
|
|
<p>Revised July 15, 2008</p>
|
2000-07-27 14:04:40 +00:00
|
|
|
|
2006-11-04 22:58:43 +00:00
|
|
|
<p>© Copyright Beman Dawes 1999. Use, modification, and distribution are
|
|
|
|
|
subject to the Boost Software License, Version 1.0. (See accompanying file <a
|
2008-02-09 13:02:45 +00:00
|
|
|
href="../../LICENSE_1_0.txt">LICENSE_1_0.txt</a> or a copy at <<a
|
2006-11-04 22:58:43 +00:00
|
|
|
href="http://www.boost.org/LICENSE_1_0.txt">http://www.boost.org/LICENSE_1_0.txt</a>>.)</p>
|
2000-07-27 14:04:40 +00:00
|
|
|
</body>
|
2008-02-09 13:02:45 +00:00
|
|
|
</html>
|
