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<title>Header boost/cstdint.hpp</title>
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<h1><img src="../../c++boost.gif" alt="c++boost.gif (8819 bytes)" align="center" width="277" height="86">Header
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boost/cstdint.hpp </h1>
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<p>The header <code><a href="../../boost/cstdint.hpp"><boost/cstdint.hpp></a></code>
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provides the typedef's useful for
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writing portable code that requires certain integer widths. All typedef's are in namespace boost.</p>
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<p>The specifications are based on the ISO/IEC 9899:1999 C Language standard
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header <stdint.h>. The 64-bit types required by the C standard are not
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required in the boost header, and may not be supplied in all implementations,
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because <code>long long</code> is not [yet] included in the C++ standard.</p>
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<p>See <a href="cstdint_test.cpp">cstdint_test.cpp</a> for a test program.</p>
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<h2>Exact-width integer types</h2>
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<p>The typedef <code>int#_t</code>, with # replaced by the width, designates a
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signed integer type of exactly # bits; <code>int8_t</code> denotes an 8-bit
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signed integer type. Similarly, the typedef <code>uint#_t</code>
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designates and unsigned integer type of exactly # bits.</p>
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<p>These types are optional. However, if an implementation provides integer
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types with widths of 8, 16, 32, or 64 bits, it shall define the corresponding
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typedef names.</p>
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<h2>Minimum-width integer types</h2>
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<p>The typedef <code>int_least#_t</code>, with # replaced by the width,
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designates a signed integer type with a width of at least # bits, such that no
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signed integer type with lesser size has at least the specified width. Thus, <code>int_least32_t</code>
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denotes a signed integer type with a width of at least 32 bits. Similarly, the
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typedef name <code>uint_least#_t</code> designates an unsigned integer type with
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a width of at least # bits, such that no unsigned integer type with lesser size
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has at least the specified width.</p>
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<p>Required minimum-width integer types:</p>
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<ul>
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<li><code>int_least8_t</code></li>
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<li><code>int_least16_t</code></li>
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<li><code>int_least32_t</code></li>
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<li><code>uint_least8_t</code></li>
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<li><code>uint_least16_t</code></li>
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<li><code>uint_least32_t</code></li>
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</ul>
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<p>All other minimum-width integer types are optional.</p>
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<h2>Fastest minimum-width integer types</h2>
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<p>The typedef <code>int_fast#_t</code>, with # replaced by the width,
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designates the fastest signed integer type with a width of at least # bits.
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Similarly, the typedef name <code>uint_fast#_t</code> designates the fastest
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unsigned integer type with a width of at least # bits.</p>
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<p>There is no guarantee that these types are fastest for all purposes. In
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any case, however, they satisfy the signedness and width requirements.</p>
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<p>Required fastest minimum-width integer types:</p>
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<ul>
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<li><code>int_fast8_t</code></li>
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<li><code>int_fast16_t</code></li>
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<li><code>int_fast32_t</code></li>
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<li><code>uint_fast8_t</code></li>
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<li><code>uint_fast16_t</code></li>
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<li><code>uint_fast32_t</code></li>
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</ul>
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<p>All other fastest minimum-width integer types are optional.</p>
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<h2>Greatest-width integer types</h2>
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<p>The typedef <code>intmax_t </code>designates a signed integer type capable of
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representing any value of any signed integer type.</p>
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<p>The typedef <code>uintmax_t</code> designates an unsigned integer type
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capable of representing any value of any unsigned integer type.</p>
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<p>These types are required.</p>
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<hr>
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<p>Revised <!--webbot bot="Timestamp" s-type="EDITED" s-format="%d %b %Y" startspan -->19 Aug 2001<!--webbot bot="Timestamp" endspan i-checksum="14767" -->
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</p>
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<p> </p>
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