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Move cstdint docs to this module
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Glen Fernandes
@ -50,6 +50,7 @@ Distributed under the Boost Software License, Version 1.0.
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[include configuring_boost.qbk]
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[include macro_reference.qbk]
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[include cstdint.qbk]
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[include guidelines.qbk]
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[include rationale.qbk]
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[include acknowledgements.qbk]
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139
doc/cstdint.qbk
Normal file
139
doc/cstdint.qbk
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@ -0,0 +1,139 @@
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[section:cstdint Standard Integer Types]
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[section Overview]
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The header [^[@../../../../boost/cstdint.hpp <boost/cstdint.hpp>]] provides the typedef's useful
|
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for writing portable code that requires certain integer widths. All typedef's are in namespace boost.
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The specifications for these types are based on the ISO/IEC 9899:1999 C Language standard header <stdint.h>.
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The 64-bit types required by the C standard are ['not required] in the boost header,
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and may not be supplied for all platforms/compilers, because [^long long] is not [yet] included in the C++ standard.
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See [@../../test/cstdint_test.cpp cstdint_test.cpp] for a test program.
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[endsect]
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[section:rationale Rationale]
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The organization of the Boost.Integer headers and classes is designed to take advantage of <stdint.h> types from the
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1999 C standard without causing undefined behavior in terms of the 1998 C++ standard.
|
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The header <boost/cstdint.hpp> makes the standard integer types safely available in namespace [^boost]
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without placing any names in namespace [^std]. The intension is to complement rather than compete
|
||||
with the C++ Standard Library. Should some future C++ standard include <stdint.h> and <cstdint>,
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||||
then <boost/cstdint.hpp> will continue to function, but will become redundant and may be safely deprecated.
|
||||
|
||||
Because these are boost headers, their names conform to boost header naming conventions rather than
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||||
C++ Standard Library header naming conventions.
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||||
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||||
[endsect]
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||||
|
||||
[section:ce ['Caveat emptor]]
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||||
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||||
As an implementation artifact, certain C <limits.h> macro names may possibly be
|
||||
visible to users of <boost/cstdint.hpp>. Don't use these macros; they are not part of
|
||||
any Boost-specified interface. Use [^boost::integer_traits<>] or [^std::numeric_limits<>] instead.
|
||||
|
||||
As another implementation artifact, certain C <stdint.h> typedef names may possibly be visible
|
||||
in the global namespace to users of <boost/cstdint.hpp>. Don't use these names, they are not part of
|
||||
any Boost-specified interface. Use the respective names in namespace [^boost] instead.
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|
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[endsect]
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||||
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[section Exact-width integer types]
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|
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The typedef [^int#_t], with # replaced by the width, designates a signed integer type of exactly # bits;
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for example [^int8_t] denotes an 8-bit signed integer type. Similarly, the typedef [^uint#_t] designates an unsigned
|
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integer type of exactly # bits.
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|
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These types are optional. However, if a platform supports integer types with widths of
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8, 16, 32, 64, or any combination thereof, then <boost/cstdint.hpp> does provide the
|
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corresponding typedefs.
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The absence of int64_t and uint64_t is indicated by the macro `BOOST_NO_INT64_T`.
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[endsect]
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||||
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[section Minimum-width integer types]
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The typedef [^int_least#_t], with # replaced by the width, designates a signed integer type with a width
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of at least # bits, such that no signed integer type with lesser size has at least the specified width.
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Thus, [^int_least32_t] denotes the smallest signed integer type with a width of at least 32 bits.
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Similarly, the typedef name [^uint_least#_t] designates an unsigned integer type with a width of at least # bits,
|
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such that no unsigned integer type with lesser size has at least the specified width.
|
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|
||||
The following minimum-width integer types are provided for all platforms:
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|
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* [^int_least8_t]
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* [^int_least16_t]
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* [^int_least32_t]
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* [^uint_least8_t]
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* [^uint_least16_t]
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* [^uint_least32_t]
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|
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The following types are available only if, after including <boost/cstdint.hpp>, the macro BOOST_NO_INT64_T is not defined:
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|
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* [^int_least64_t]
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* [^uint_least64_t]
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All other minimum-width integer types are optional.
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[endsect]
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[section Fastest minimum-width integer types]
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The typedef [^int_fast#_t], with # replaced by the width, designates the fastest signed integer type
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with a width of at least # bits. Similarly, the typedef name [^uint_fast#_t] designates the fastest
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unsigned integer type with a width of at least # bits.
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There is no guarantee that these types are fastest for all purposes. In any case, however, they satisfy
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the signedness and width requirements.
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The following fastest minimum-width integer types are provided for all platforms:
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|
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* [^int_fast8_t]
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* [^int_fast16_t]
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* [^int_fast32_t]
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* [^uint_fast8_t]
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* [^uint_fast16_t]
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* [^uint_fast32_t]
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|
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The following types are available only if, after including <boost/cstdint.hpp>, the macro BOOST_NO_INT64_T is not defined:
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|
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* [^int_fast64_t]
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* [^uint_fast64_t]
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|
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All other fastest minimum-width integer types are optional.
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[endsect]
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[section Greatest-width integer types]
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The typedef [^intmax_t ]designates a signed integer type capable of representing any value of any signed integer type.
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The typedef [^uintmax_t] designates an unsigned integer type capable of representing any value of any unsigned integer type.
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These types are provided for all platforms.
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[endsect]
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[section Integer Constant Macros]
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The following macros are always defined after inclusion of this header, these allow
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integer constants of at least the specified width to be declared:
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INT8_C, UINT8_C, INT16_C, UINT16_C, INT32_C, UINT32_C, INTMAX_C, UINTMAX_C.
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The macros INT64_C and UINT64_C are also defined if the the macro BOOST_NO_INT64_T is not defined.
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The C99 macro __STDC_CONSTANT_MACROS is also defined as an artifact of the implementation.
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For example:
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#include <boost/cstdint.hpp>
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// Here the constant 0x1FFFFFFFF has the correct suffix applied:
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static const boost::uint64_t c = INT64_C(0x1FFFFFFFF);
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[endsect]
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[endsect]
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@ -7,7 +7,7 @@
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<link rel="home" href="../index.html" title="Boost.Config">
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289
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Constant Macros</a></span></dt>
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<a name="boost_config.cstdint.overview"></a><a class="link" href="cstdint.html#boost_config.cstdint.overview" title="Overview">Overview</a>
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</h3></div></div></div>
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<p>
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The header <code class="literal"><a href="../../../../../boost/cstdint.hpp" target="_top"><boost/cstdint.hpp></a></code>
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provides the typedef's useful for writing portable code that requires certain
|
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integer widths. All typedef's are in namespace boost.
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</p>
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<p>
|
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The specifications for these types are based on the ISO/IEC 9899:1999 C Language
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standard header <stdint.h>. The 64-bit types required by the C standard
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are <span class="emphasis"><em>not required</em></span> in the boost header, and may not be
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supplied for all platforms/compilers, because <code class="literal">long long</code>
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is not [yet] included in the C++ standard.
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</p>
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||||
<p>
|
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See <a href="../../../test/cstdint_test.cpp" target="_top">cstdint_test.cpp</a> for
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a test program.
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||||
</p>
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</div>
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<div class="section">
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<div class="titlepage"><div><div><h3 class="title">
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<a name="boost_config.cstdint.rationale"></a><a class="link" href="cstdint.html#boost_config.cstdint.rationale" title="Rationale">Rationale</a>
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</h3></div></div></div>
|
||||
<p>
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The organization of the Boost.Integer headers and classes is designed to
|
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take advantage of <stdint.h> types from the 1999 C standard without
|
||||
causing undefined behavior in terms of the 1998 C++ standard. The header
|
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<boost/cstdint.hpp> makes the standard integer types safely available
|
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in namespace <code class="literal">boost</code> without placing any names in namespace
|
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<code class="literal">std</code>. The intension is to complement rather than compete
|
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with the C++ Standard Library. Should some future C++ standard include <stdint.h>
|
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and <cstdint>, then <boost/cstdint.hpp> will continue to function,
|
||||
but will become redundant and may be safely deprecated.
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||||
</p>
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||||
<p>
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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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</p>
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</div>
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<div class="section">
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<div class="titlepage"><div><div><h3 class="title">
|
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<a name="boost_config.cstdint.ce"></a><a class="link" href="cstdint.html#boost_config.cstdint.ce" title="Caveat emptor"><span class="emphasis"><em>Caveat emptor</em></span></a>
|
||||
</h3></div></div></div>
|
||||
<p>
|
||||
As an implementation artifact, certain C <limits.h> macro names may
|
||||
possibly be visible to users of <boost/cstdint.hpp>. Don't use these
|
||||
macros; they are not part of any Boost-specified interface. Use <code class="literal">boost::integer_traits<></code>
|
||||
or <code class="literal">std::numeric_limits<></code> instead.
|
||||
</p>
|
||||
<p>
|
||||
As another implementation artifact, certain C <stdint.h> typedef names
|
||||
may possibly be visible in the global namespace to users of <boost/cstdint.hpp>.
|
||||
Don't use these names, they are not part of any Boost-specified interface.
|
||||
Use the respective names in namespace <code class="literal">boost</code> instead.
|
||||
</p>
|
||||
</div>
|
||||
<div class="section">
|
||||
<div class="titlepage"><div><div><h3 class="title">
|
||||
<a name="boost_config.cstdint.exact_width_integer_types"></a><a class="link" href="cstdint.html#boost_config.cstdint.exact_width_integer_types" title="Exact-width integer types">Exact-width
|
||||
integer types</a>
|
||||
</h3></div></div></div>
|
||||
<p>
|
||||
The typedef <code class="literal">int#_t</code>, with # replaced by the width, designates
|
||||
a signed integer type of exactly # bits; for example <code class="literal">int8_t</code>
|
||||
denotes an 8-bit signed integer type. Similarly, the typedef <code class="literal">uint#_t</code>
|
||||
designates an unsigned integer type of exactly # bits.
|
||||
</p>
|
||||
<p>
|
||||
These types are optional. However, if a platform supports integer types with
|
||||
widths of 8, 16, 32, 64, or any combination thereof, then <boost/cstdint.hpp>
|
||||
does provide the corresponding typedefs.
|
||||
</p>
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||||
<p>
|
||||
The absence of int64_t and uint64_t is indicated by the macro <code class="computeroutput"><span class="identifier">BOOST_NO_INT64_T</span></code>.
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||||
</p>
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||||
</div>
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||||
<div class="section">
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||||
<div class="titlepage"><div><div><h3 class="title">
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||||
<a name="boost_config.cstdint.minimum_width_integer_types"></a><a class="link" href="cstdint.html#boost_config.cstdint.minimum_width_integer_types" title="Minimum-width integer types">Minimum-width
|
||||
integer types</a>
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||||
</h3></div></div></div>
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<p>
|
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The typedef <code class="literal">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 signed integer type with lesser size has at least the specified width.
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Thus, <code class="literal">int_least32_t</code> denotes the smallest signed integer
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||||
type with a width of at least 32 bits. Similarly, the typedef name <code class="literal">uint_least#_t</code>
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designates an unsigned integer type with a width of at least # bits, such
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that no unsigned integer type with lesser size has at least the specified
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width.
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</p>
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<p>
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||||
The following minimum-width integer types are provided for all platforms:
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</p>
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||||
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
|
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<li class="listitem">
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<code class="literal">int_least8_t</code>
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</li>
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<li class="listitem">
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<code class="literal">int_least16_t</code>
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</li>
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<li class="listitem">
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<code class="literal">int_least32_t</code>
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</li>
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<li class="listitem">
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<code class="literal">uint_least8_t</code>
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</li>
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<li class="listitem">
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<code class="literal">uint_least16_t</code>
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</li>
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<li class="listitem">
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<code class="literal">uint_least32_t</code>
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</li>
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</ul></div>
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<p>
|
||||
The following types are available only if, after including <boost/cstdint.hpp>,
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||||
the macro BOOST_NO_INT64_T is not defined:
|
||||
</p>
|
||||
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
|
||||
<li class="listitem">
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||||
<code class="literal">int_least64_t</code>
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</li>
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||||
<li class="listitem">
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||||
<code class="literal">uint_least64_t</code>
|
||||
</li>
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</ul></div>
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<p>
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All other minimum-width integer types are optional.
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</p>
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</div>
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<div class="section">
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||||
<div class="titlepage"><div><div><h3 class="title">
|
||||
<a name="boost_config.cstdint.fastest_minimum_width_integer_types"></a><a class="link" href="cstdint.html#boost_config.cstdint.fastest_minimum_width_integer_types" title="Fastest minimum-width integer types">Fastest
|
||||
minimum-width integer types</a>
|
||||
</h3></div></div></div>
|
||||
<p>
|
||||
The typedef <code class="literal">int_fast#_t</code>, with # replaced by the width,
|
||||
designates the fastest signed integer type with a width of at least # bits.
|
||||
Similarly, the typedef name <code class="literal">uint_fast#_t</code> designates the
|
||||
fastest unsigned integer type with a width of at least # bits.
|
||||
</p>
|
||||
<p>
|
||||
There is no guarantee that these types are fastest for all purposes. In any
|
||||
case, however, they satisfy the signedness and width requirements.
|
||||
</p>
|
||||
<p>
|
||||
The following fastest minimum-width integer types are provided for all platforms:
|
||||
</p>
|
||||
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
|
||||
<li class="listitem">
|
||||
<code class="literal">int_fast8_t</code>
|
||||
</li>
|
||||
<li class="listitem">
|
||||
<code class="literal">int_fast16_t</code>
|
||||
</li>
|
||||
<li class="listitem">
|
||||
<code class="literal">int_fast32_t</code>
|
||||
</li>
|
||||
<li class="listitem">
|
||||
<code class="literal">uint_fast8_t</code>
|
||||
</li>
|
||||
<li class="listitem">
|
||||
<code class="literal">uint_fast16_t</code>
|
||||
</li>
|
||||
<li class="listitem">
|
||||
<code class="literal">uint_fast32_t</code>
|
||||
</li>
|
||||
</ul></div>
|
||||
<p>
|
||||
The following types are available only if, after including <boost/cstdint.hpp>,
|
||||
the macro BOOST_NO_INT64_T is not defined:
|
||||
</p>
|
||||
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; ">
|
||||
<li class="listitem">
|
||||
<code class="literal">int_fast64_t</code>
|
||||
</li>
|
||||
<li class="listitem">
|
||||
<code class="literal">uint_fast64_t</code>
|
||||
</li>
|
||||
</ul></div>
|
||||
<p>
|
||||
All other fastest minimum-width integer types are optional.
|
||||
</p>
|
||||
</div>
|
||||
<div class="section">
|
||||
<div class="titlepage"><div><div><h3 class="title">
|
||||
<a name="boost_config.cstdint.greatest_width_integer_types"></a><a class="link" href="cstdint.html#boost_config.cstdint.greatest_width_integer_types" title="Greatest-width integer types">Greatest-width
|
||||
integer types</a>
|
||||
</h3></div></div></div>
|
||||
<p>
|
||||
The typedef <code class="literal">intmax_t </code>designates a signed integer type
|
||||
capable of representing any value of any signed integer type.
|
||||
</p>
|
||||
<p>
|
||||
The typedef <code class="literal">uintmax_t</code> designates an unsigned integer type
|
||||
capable of representing any value of any unsigned integer type.
|
||||
</p>
|
||||
<p>
|
||||
These types are provided for all platforms.
|
||||
</p>
|
||||
</div>
|
||||
<div class="section">
|
||||
<div class="titlepage"><div><div><h3 class="title">
|
||||
<a name="boost_config.cstdint.integer_constant_macros"></a><a class="link" href="cstdint.html#boost_config.cstdint.integer_constant_macros" title="Integer Constant Macros">Integer
|
||||
Constant Macros</a>
|
||||
</h3></div></div></div>
|
||||
<p>
|
||||
The following macros are always defined after inclusion of this header, these
|
||||
allow integer constants of at least the specified width to be declared: INT8_C,
|
||||
UINT8_C, INT16_C, UINT16_C, INT32_C, UINT32_C, INTMAX_C, UINTMAX_C.
|
||||
</p>
|
||||
<p>
|
||||
The macros INT64_C and UINT64_C are also defined if the the macro BOOST_NO_INT64_T
|
||||
is not defined.
|
||||
</p>
|
||||
<p>
|
||||
The C99 macro __STDC_CONSTANT_MACROS is also defined as an artifact of the
|
||||
implementation.
|
||||
</p>
|
||||
<p>
|
||||
For example:
|
||||
</p>
|
||||
<pre class="programlisting"><span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">cstdint</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span>
|
||||
|
||||
<span class="comment">// Here the constant 0x1FFFFFFFF has the correct suffix applied:</span>
|
||||
<span class="keyword">static</span> <span class="keyword">const</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">uint64_t</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">INT64_C</span><span class="special">(</span><span class="number">0</span><span class="identifier">x1FFFFFFFF</span><span class="special">);</span>
|
||||
</pre>
|
||||
</div>
|
||||
</div>
|
||||
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
|
||||
<td align="left"></td>
|
||||
<td align="right"><div class="copyright-footer">Copyright © 2001-2007 Beman Dawes, Vesa Karvonen, John
|
||||
Maddock<p>
|
||||
Distributed under the Boost Software License, Version 1.0. (See accompanying
|
||||
file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
|
||||
</p>
|
||||
</div></td>
|
||||
</tr></table>
|
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<hr>
|
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<div class="spirit-nav">
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<div class="section">
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||||
<div class="titlepage"><div><div><h2 class="title" style="clear: both">
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@ -371,7 +371,7 @@
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</tr></table>
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<hr>
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<div class="spirit-nav">
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<a accesskey="p" href="boost_macro_reference.html"><img src="../../../../../doc/src/images/prev.png" alt="Prev"></a><a accesskey="u" href="../index.html"><img src="../../../../../doc/src/images/up.png" alt="Up"></a><a accesskey="h" href="../index.html"><img src="../../../../../doc/src/images/home.png" alt="Home"></a><a accesskey="n" href="rationale.html"><img src="../../../../../doc/src/images/next.png" alt="Next"></a>
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</div>
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</body>
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|
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@ -77,6 +77,22 @@
|
||||
<dt><span class="section"><a href="boost_config/boost_macro_reference.html#boost_config.boost_macro_reference.macros_for_libraries_with_separate_source_code">Macros
|
||||
for libraries with separate source code</a></span></dt>
|
||||
</dl></dd>
|
||||
<dt><span class="section"><a href="boost_config/cstdint.html">Standard Integer Types</a></span></dt>
|
||||
<dd><dl>
|
||||
<dt><span class="section"><a href="boost_config/cstdint.html#boost_config.cstdint.overview">Overview</a></span></dt>
|
||||
<dt><span class="section"><a href="boost_config/cstdint.html#boost_config.cstdint.rationale">Rationale</a></span></dt>
|
||||
<dt><span class="section"><a href="boost_config/cstdint.html#boost_config.cstdint.ce"><span class="emphasis"><em>Caveat emptor</em></span></a></span></dt>
|
||||
<dt><span class="section"><a href="boost_config/cstdint.html#boost_config.cstdint.exact_width_integer_types">Exact-width
|
||||
integer types</a></span></dt>
|
||||
<dt><span class="section"><a href="boost_config/cstdint.html#boost_config.cstdint.minimum_width_integer_types">Minimum-width
|
||||
integer types</a></span></dt>
|
||||
<dt><span class="section"><a href="boost_config/cstdint.html#boost_config.cstdint.fastest_minimum_width_integer_types">Fastest
|
||||
minimum-width integer types</a></span></dt>
|
||||
<dt><span class="section"><a href="boost_config/cstdint.html#boost_config.cstdint.greatest_width_integer_types">Greatest-width
|
||||
integer types</a></span></dt>
|
||||
<dt><span class="section"><a href="boost_config/cstdint.html#boost_config.cstdint.integer_constant_macros">Integer
|
||||
Constant Macros</a></span></dt>
|
||||
</dl></dd>
|
||||
<dt><span class="section"><a href="boost_config/guidelines_for_boost_authors.html">Guidelines for
|
||||
Boost Authors</a></span></dt>
|
||||
<dd><dl>
|
||||
@ -951,7 +967,7 @@
|
||||
</div>
|
||||
</div>
|
||||
<table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
|
||||
<td align="left"><p><small>Last revised: May 31, 2014 at 11:09:07 GMT</small></p></td>
|
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<td align="left"><p><small>Last revised: June 01, 2014 at 09:50:01 GMT</small></p></td>
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<td align="right"><div class="copyright-footer"></div></td>
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