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'unlabeled-1.4.2'. [SVN r9366]
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81
include/boost/integer.hpp
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// boost integer.hpp header file -------------------------------------------//
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// (C) Copyright Beman Dawes 1999. Permission to copy, use, modify, sell
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// and distribute this software is granted provided this copyright
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// notice appears in all copies. This software is provided "as is" without
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// express or implied warranty, and with no claim as to its suitability for
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// any purpose.
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// See http://www.boost.org for most recent version including documentation.
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// Revision History
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// 30 Jul 00 Add typename syntax fix (Jens Maurer)
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// 28 Aug 99 Initial version
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#ifndef BOOST_INTEGER_HPP
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#define BOOST_INTEGER_HPP
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#include <limits>
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namespace boost
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{
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// Helper templates ------------------------------------------------------//
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// fast integers from least integers
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template< typename LeastInt >
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struct int_fast_t { typedef LeastInt fast; }; // imps may specialize
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// convert category to type
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template< int Category > struct int_least_helper {}; // default is empty
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// specializatons: 1=long, 2=int, 3=short, 4=signed char,
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// 6=unsigned long, 7=unsigned int, 8=unsigned short, 9=unsigned long
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template<> struct int_least_helper<1> { typedef long least; };
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template<> struct int_least_helper<2> { typedef int least; };
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template<> struct int_least_helper<3> { typedef short least; };
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template<> struct int_least_helper<4> { typedef signed char least; };
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template<> struct int_least_helper<6> { typedef unsigned long least; };
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template<> struct int_least_helper<7> { typedef unsigned int least; };
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template<> struct int_least_helper<8> { typedef unsigned short least; };
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template<> struct int_least_helper<9> { typedef unsigned char least; };
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// integer templates specifying number of bits ---------------------------//
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// signed
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template< int Bits > // bits (including sign) required
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struct int_t
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{
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typedef typename int_least_helper
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<
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(Bits-1 <= std::numeric_limits<long>::digits) +
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(Bits-1 <= std::numeric_limits<int>::digits) +
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(Bits-1 <= std::numeric_limits<short>::digits) +
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(Bits-1 <= std::numeric_limits<signed char>::digits)
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>::least least;
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typedef typename int_fast_t<least>::fast fast;
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};
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// unsigned
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template< int Bits > // bits required
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struct uint_t
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{
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typedef typename int_least_helper
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<
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5 +
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(Bits <= std::numeric_limits<unsigned long>::digits) +
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(Bits <= std::numeric_limits<unsigned int>::digits) +
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(Bits <= std::numeric_limits<unsigned short>::digits) +
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(Bits <= std::numeric_limits<unsigned char>::digits)
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>::least least;
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typedef typename int_fast_t<least>::fast fast;
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};
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// The same dispatching technique can be used to select types based on
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// values. That will be added once boost::integer_traits is available.
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} // namespace boost
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#endif // BOOST_INTEGER_HPP
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98
index.htm
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index.htm
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<html>
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<head>
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<meta http-equiv="Content-Language" content="en-us">
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<meta name="GENERATOR" content="Microsoft FrontPage 4.0">
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<meta name="ProgId" content="FrontPage.Editor.Document">
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<title>Boost Integer Library</title>
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</head>
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<body bgcolor="#FFFFFF" text="#000000">
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<table border="1" bgcolor="#007F7F" cellpadding="2">
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<tr>
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<td bgcolor="#FFFFFF"><img src="../../c++boost.gif" alt="c++boost.gif (8819 bytes)" width="277" height="86"></td>
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<td><a href="../../index.htm"><font face="Arial" color="#FFFFFF"><big>Home </big></font></a></td>
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<td><a href="../libraries.htm"><font face="Arial" color="#FFFFFF"><big>Libraries </big></font></a></td>
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<td><a href="../../people/people.htm"><font face="Arial" color="#FFFFFF"><big>People </big></font></a></td>
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<td><a href="../../more/faq.htm"><font face="Arial" color="#FFFFFF"><big>FAQ </big></font></a></td>
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<td><a href="../../more/index.htm"><font face="Arial" color="#FFFFFF"><big>More </big></font></a></td>
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</tr>
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</table>
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<h1>Boost Integer Library</h1>
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<table border="1" cellpadding="5">
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<tr>
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<td align="center"><b><i>Header / Docs</i></b></td>
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<td align="center"><b><i>Contents</i></b></td>
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<td align="center"><b><i>Use</i></b></td>
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</tr>
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<tr>
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<td align="center"><code><a href="../../boost/cstdint.hpp"><boost/cstdint.hpp><br>
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</a></code><a href="cstdint.htm"><br>
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documentation</a>
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</td>
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<td valign="top">Typedef's based on the 1999 C Standard header <<code>stdint.h></code>, wrapped in namespace boost.
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This implementation may #include the compiler
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supplied <<code>stdint.h></code>, if present. </td>
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<td valign="top">Supplies typedefs for standard integer types such as <code> int32_t</code> or <code>uint_least16_t</code>.
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Use in preference to <<code>stdint.h></code>
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for enhanced portability. Furthermore, all names are safely placed in the boost namespace.</td>
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</tr>
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<tr>
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<td align="center"><code><a href="../../boost/integer_traits.hpp"><boost/integer_traits.hpp></a></code><br>
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<br>
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<a href="integer_traits.html">documentation</a>
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</td>
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<td valign="top">Template class <code>boost::integer_traits</code>, derived from <code>std::numeric_limits</code>.
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Adds <code>const_min</code> and <code>const_max</code> members.</td>
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<td valign="top">Use to obtain the characteristics of a known integer type.</td>
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</tr>
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<tr>
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<td align="center"><code><a href="../../boost/integer.hpp"><boost/integer.hpp></a><br>
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<br>
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</code><a href="integer.htm">documentation</a></td>
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<td valign="top">Templates for integer type selection based on properties such as
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maximum value or number of bits.</td>
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<td valign="top">Use to select the type an integer when some property such as maximum value or number of bits is known.
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Useful for generic programming. </td>
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</tr>
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</table>
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<h2>Rationale</h2>
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<p>The organization of boost integer headers and classes is designed to take
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advantage of <code><stdint.h></code> types from the 1999 C standard
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without resorting to undefined behavior in terms of
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the 1998 C++ standard. The header <code><boost/cstdint.hpp></code>
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makes the standard integer types safely available in namespace boost without placing any names in namespace std. As always, the intension is to complement rather than
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compete with the C++ Standard Library. Should some future C++ standard
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include <code><stdint.h></code> and <code><cstdint></code>, then <code><boost/cstdint.hpp></code>
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will continue to function, but will become redundant and may be safely deprecated.</p>
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<p>Because these are boost headers, their names conform to boost header naming
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conventions rather than C++ Standard Library header naming conventions.
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<h2>Caveat emptor</h2>
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<p>As an
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implementation artifact, certain C <limits.h> macro names may possibly be
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visible to users of <boost/cstdint.hpp>. Don't use these macros; they are not part of
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any Boost specified interface.
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Use boost:: integer_traits<> or std::numeric_limits<> instead.</p>
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<p>
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As another implementation artifact, certain C
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<code><stdint.h></code> typedef names may possibly be visible in the
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global namespace to users of <code><boost/cstdint.hpp></code>.
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Don't use these names, they are not part of any Boost specified
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interface. Use the respective names in namespace <code>boost</code>
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instead.
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<hr>
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<p>Revised: <!--webbot bot="Timestamp" S-Type="EDITED" S-Format="%d %b %Y" startspan -->14 Nov 2000<!--webbot bot="Timestamp" endspan i-checksum="15241" -->
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</p>
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</body>
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</html>
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