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| 7 | <title>Header boost/cstdint.hpp</title> |
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| 12 | <h1><img src="../../boost.png" alt="boost.png (6897 bytes)" align="center" width="277" height="86">Header |
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| 13 | boost/cstdint.hpp </h1> |
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| 14 | <p>The header <code><a href="../../boost/cstdint.hpp"><boost/cstdint.hpp></a></code> |
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| 15 | provides the typedef's useful for |
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| 16 | writing portable code that requires certain integer widths. All typedef's are in namespace boost.</p> |
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| 17 | <p>The specifications are based on the ISO/IEC 9899:1999 C Language standard |
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| 18 | header <stdint.h>. The 64-bit types required by the C standard are not |
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| 19 | required in the boost header, and may not be supplied in all implementations, |
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| 20 | because <code>long long</code> is not [yet] included in the C++ standard.</p> |
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| 21 | <p>See <a href="cstdint_test.cpp">cstdint_test.cpp</a> for a test program.</p> |
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| 22 | <h2>Exact-width integer types</h2> |
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| 23 | <p>The typedef <code>int#_t</code>, with # replaced by the width, designates a |
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| 24 | signed integer type of exactly # bits; <code>int8_t</code> denotes an 8-bit |
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| 25 | signed integer type. Similarly, the typedef <code>uint#_t</code> |
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| 26 | designates and unsigned integer type of exactly # bits.</p> |
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| 27 | <p>These types are optional. However, if an implementation provides integer |
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| 28 | types with widths of 8, 16, 32, or 64 bits, it shall define the corresponding |
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| 29 | typedef names.</p> |
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| 30 | <h2>Minimum-width integer types</h2> |
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| 31 | <p>The typedef <code>int_least#_t</code>, with # replaced by the width, |
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| 32 | designates a signed integer type with a width of at least # bits, such that no |
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| 33 | signed integer type with lesser size has at least the specified width. Thus, <code>int_least32_t</code> |
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| 34 | denotes a signed integer type with a width of at least 32 bits. Similarly, the |
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| 35 | typedef name <code>uint_least#_t</code> designates an unsigned integer type with |
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| 36 | a width of at least # bits, such that no unsigned integer type with lesser size |
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| 37 | has at least the specified width.</p> |
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| 38 | <p>Required minimum-width integer types:</p> |
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| 39 | <ul> |
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| 40 | <li><code>int_least8_t</code></li> |
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| 41 | <li><code>int_least16_t</code></li> |
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| 42 | <li><code>int_least32_t</code></li> |
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| 43 | <li><code>uint_least8_t</code></li> |
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| 44 | <li><code>uint_least16_t</code></li> |
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| 45 | <li><code>uint_least32_t</code></li> |
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| 46 | </ul> |
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| 47 | <p>All other minimum-width integer types are optional.</p> |
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| 48 | <h2>Fastest minimum-width integer types</h2> |
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| 49 | <p>The typedef <code>int_fast#_t</code>, with # replaced by the width, |
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| 50 | designates the fastest signed integer type with a width of at least # bits. |
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| 51 | Similarly, the typedef name <code>uint_fast#_t</code> designates the fastest |
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| 52 | unsigned integer type with a width of at least # bits.</p> |
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| 53 | <p>There is no guarantee that these types are fastest for all purposes. In |
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| 54 | any case, however, they satisfy the signedness and width requirements.</p> |
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| 55 | <p>Required fastest minimum-width integer types:</p> |
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| 56 | <ul> |
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| 57 | <li><code>int_fast8_t</code></li> |
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| 58 | <li><code>int_fast16_t</code></li> |
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| 59 | <li><code>int_fast32_t</code></li> |
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| 60 | <li><code>uint_fast8_t</code></li> |
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| 61 | <li><code>uint_fast16_t</code></li> |
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| 62 | <li><code>uint_fast32_t</code></li> |
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| 63 | </ul> |
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| 64 | <p>All other fastest minimum-width integer types are optional.</p> |
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| 65 | <h2>Greatest-width integer types</h2> |
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| 66 | <p>The typedef <code>intmax_t </code>designates a signed integer type capable of |
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| 67 | representing any value of any signed integer type.</p> |
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| 68 | <p>The typedef <code>uintmax_t</code> designates an unsigned integer type |
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| 69 | capable of representing any value of any unsigned integer type.</p> |
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| 70 | <p>These types are required.</p> |
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| 71 | <hr> |
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| 72 | <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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| 73 | </p> |
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| 74 | <p> </p> |
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| 75 | |
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| 76 | </body> |
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| 78 | </html> |
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