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- </div>
- <div class="section">
- <div class="titlepage"><div><div><h3 class="title">
- <a name="boost_multiprecision.tut.import_export"></a><a class="link" href="import_export.html" title="Importing and Exporting Data to and from cpp_int and cpp_bin_float">Importing and
- Exporting Data to and from <code class="computeroutput"><span class="identifier">cpp_int</span></code>
- and <code class="computeroutput"><span class="identifier">cpp_bin_float</span></code></a>
- </h3></div></div></div>
- <p>
- Any integer number type that uses <code class="computeroutput"><span class="identifier">cpp_int_backend</span></code>
- as it's implementation layer can import or export its bits via two non-member
- functions:
- </p>
- <pre class="programlisting"><span class="keyword">template</span> <span class="special"><</span><span class="keyword">unsigned</span> <span class="identifier">MinBits</span><span class="special">,</span> <span class="keyword">unsigned</span> <span class="identifier">MaxBits</span><span class="special">,</span> <span class="identifier">cpp_integer_type</span> <span class="identifier">SignType</span><span class="special">,</span> <span class="identifier">cpp_int_check_type</span> <span class="identifier">Checked</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Allocator</span><span class="special">,</span>
- <span class="identifier">expression_template_option</span> <span class="identifier">ExpressionTemplates</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">OutputIterator</span><span class="special">></span>
- <span class="identifier">OutputIterator</span> <span class="identifier">export_bits</span><span class="special">(</span>
- <span class="keyword">const</span> <span class="identifier">number</span><span class="special"><</span><span class="keyword">const</span> <span class="identifier">cpp_int_backend</span><span class="special"><</span><span class="identifier">MinBits</span><span class="special">,</span> <span class="identifier">MaxBits</span><span class="special">,</span> <span class="identifier">SignType</span><span class="special">,</span> <span class="identifier">Checked</span><span class="special">,</span> <span class="identifier">Allocator</span><span class="special">>,</span> <span class="identifier">ExpressionTemplates</span><span class="special">>&</span> <span class="identifier">val</span><span class="special">,</span>
- <span class="identifier">OutputIterator</span> <span class="identifier">out</span><span class="special">,</span>
- <span class="keyword">unsigned</span> <span class="identifier">chunk_size</span><span class="special">,</span>
- <span class="keyword">bool</span> <span class="identifier">msv_first</span> <span class="special">=</span> <span class="keyword">true</span><span class="special">);</span>
- <span class="keyword">template</span> <span class="special"><</span><span class="keyword">unsigned</span> <span class="identifier">MinBits</span><span class="special">,</span> <span class="keyword">unsigned</span> <span class="identifier">MaxBits</span><span class="special">,</span> <span class="identifier">cpp_integer_type</span> <span class="identifier">SignType</span><span class="special">,</span> <span class="identifier">cpp_int_check_type</span> <span class="identifier">Checked</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Allocator</span><span class="special">,</span>
- <span class="identifier">expression_template_option</span> <span class="identifier">ExpressionTemplates</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Iterator</span><span class="special">></span>
- <span class="identifier">number</span><span class="special"><</span><span class="identifier">cpp_int_backend</span><span class="special"><</span><span class="identifier">MinBits</span><span class="special">,</span> <span class="identifier">MaxBits</span><span class="special">,</span> <span class="identifier">SignType</span><span class="special">,</span> <span class="identifier">Checked</span><span class="special">,</span> <span class="identifier">Allocator</span><span class="special">>,</span> <span class="identifier">ExpressionTemplates</span><span class="special">>&</span>
- <span class="identifier">import_bits</span><span class="special">(</span>
- <span class="identifier">number</span><span class="special"><</span><span class="identifier">cpp_int_backend</span><span class="special"><</span><span class="identifier">MinBits</span><span class="special">,</span> <span class="identifier">MaxBits</span><span class="special">,</span> <span class="identifier">SignType</span><span class="special">,</span> <span class="identifier">Checked</span><span class="special">,</span> <span class="identifier">Allocator</span><span class="special">>,</span> <span class="identifier">ExpressionTemplates</span><span class="special">>&</span> <span class="identifier">val</span><span class="special">,</span>
- <span class="identifier">Iterator</span> <span class="identifier">i</span><span class="special">,</span>
- <span class="identifier">Iterator</span> <span class="identifier">j</span><span class="special">,</span>
- <span class="keyword">unsigned</span> <span class="identifier">chunk_size</span> <span class="special">=</span> <span class="number">0</span><span class="special">,</span>
- <span class="keyword">bool</span> <span class="identifier">msv_first</span> <span class="special">=</span> <span class="keyword">true</span><span class="special">);</span>
- </pre>
- <p>
- These functions are designed for data-interchange with other storage formats,
- and since <a class="link" href="floats/cpp_bin_float.html" title="cpp_bin_float">cpp_bin_float</a>
- uses <a class="link" href="ints/cpp_int.html" title="cpp_int">cpp_int</a>
- internally, by extension they can be used for floating-point numbers based
- on that backend as well (see example below). Parameters and use are as follows:
- </p>
- <pre class="programlisting"><span class="keyword">template</span> <span class="special"><</span><span class="keyword">unsigned</span> <span class="identifier">MinBits</span><span class="special">,</span> <span class="keyword">unsigned</span> <span class="identifier">MaxBits</span><span class="special">,</span> <span class="identifier">cpp_integer_type</span> <span class="identifier">SignType</span><span class="special">,</span> <span class="identifier">cpp_int_check_type</span> <span class="identifier">Checked</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Allocator</span><span class="special">,</span>
- <span class="identifier">expression_template_option</span> <span class="identifier">ExpressionTemplates</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">OutputIterator</span><span class="special">></span>
- <span class="identifier">OutputIterator</span> <span class="identifier">export_bits</span><span class="special">(</span>
- <span class="keyword">const</span> <span class="identifier">number</span><span class="special"><</span><span class="keyword">const</span> <span class="identifier">cpp_int_backend</span><span class="special"><</span><span class="identifier">MinBits</span><span class="special">,</span> <span class="identifier">MaxBits</span><span class="special">,</span> <span class="identifier">SignType</span><span class="special">,</span> <span class="identifier">Checked</span><span class="special">,</span> <span class="identifier">Allocator</span><span class="special">>,</span> <span class="identifier">ExpressionTemplates</span><span class="special">>&</span> <span class="identifier">val</span><span class="special">,</span>
- <span class="identifier">OutputIterator</span> <span class="identifier">out</span><span class="special">,</span>
- <span class="keyword">unsigned</span> <span class="identifier">chunk_size</span><span class="special">,</span>
- <span class="keyword">bool</span> <span class="identifier">msv_first</span> <span class="special">=</span> <span class="keyword">true</span><span class="special">);</span>
- </pre>
- <p>
- Exports the absolute value of <code class="computeroutput"><span class="identifier">val</span></code>
- to OutputIterator <code class="computeroutput"><span class="identifier">out</span></code>. The
- function will write <code class="computeroutput"><span class="identifier">chunk_size</span></code>
- bits at a time to the OutputIterator, and if <code class="computeroutput"><span class="identifier">msv_first</span></code>
- is true, will write the most-significant block first. Byte and bit order
- within each <code class="computeroutput"><span class="identifier">chunk_size</span></code> block
- is always in the machines native format. Further, each block is stored in
- a <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">uintmax_t</span></code> when it's assigned to <code class="computeroutput"><span class="special">*</span><span class="identifier">out</span></code>.
- </p>
- <div class="note"><table border="0" summary="Note">
- <tr>
- <td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../../../../doc/src/images/note.png"></td>
- <th align="left">Note</th>
- </tr>
- <tr><td align="left" valign="top"><p>
- Unfortunately, the standard's OutputIterator concept provides no means
- of deducing the type to output since <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">iterator_traits</span><span class="special"><</span><span class="identifier">OutputIteratorType</span><span class="special">>::</span><span class="identifier">value_type</span></code>
- is type <code class="computeroutput"><span class="keyword">void</span></code>. This is why
- the bit count for each block has to be specified manually. It may also
- result in compiler warnings about the value being narrowed.
- </p></td></tr>
- </table></div>
- <div class="tip"><table border="0" summary="Tip">
- <tr>
- <td rowspan="2" align="center" valign="top" width="25"><img alt="[Tip]" src="../../../../../../doc/src/images/tip.png"></td>
- <th align="left">Tip</th>
- </tr>
- <tr><td align="left" valign="top"><p>
- If you're exporting to non-native byte layout, then use <a href="http://www.boost.org/doc/libs/release/libs/endian/doc/index.html" target="_top">Boost.Endian</a>
- to create a custom OutputIterator that reverses the byte order of each
- chunk prior to actually storing the result.
- </p></td></tr>
- </table></div>
- <pre class="programlisting"><span class="keyword">template</span> <span class="special"><</span><span class="keyword">unsigned</span> <span class="identifier">MinBits</span><span class="special">,</span> <span class="keyword">unsigned</span> <span class="identifier">MaxBits</span><span class="special">,</span> <span class="identifier">cpp_integer_type</span> <span class="identifier">SignType</span><span class="special">,</span> <span class="identifier">cpp_int_check_type</span> <span class="identifier">Checked</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">Allocator</span><span class="special">,</span>
- <span class="identifier">expression_template_option</span> <span class="identifier">ExpressionTemplates</span><span class="special">,</span> <span class="keyword">class</span> <span class="identifier">ForwardIterator</span><span class="special">></span>
- <span class="identifier">number</span><span class="special"><</span><span class="identifier">cpp_int_backend</span><span class="special"><</span><span class="identifier">MinBits</span><span class="special">,</span> <span class="identifier">MaxBits</span><span class="special">,</span> <span class="identifier">SignType</span><span class="special">,</span> <span class="identifier">Checked</span><span class="special">,</span> <span class="identifier">Allocator</span><span class="special">>,</span> <span class="identifier">ExpressionTemplates</span><span class="special">>&</span>
- <span class="identifier">import_bits</span><span class="special">(</span>
- <span class="identifier">number</span><span class="special"><</span><span class="identifier">cpp_int_backend</span><span class="special"><</span><span class="identifier">MinBits</span><span class="special">,</span> <span class="identifier">MaxBits</span><span class="special">,</span> <span class="identifier">SignType</span><span class="special">,</span> <span class="identifier">Checked</span><span class="special">,</span> <span class="identifier">Allocator</span><span class="special">>,</span> <span class="identifier">ExpressionTemplates</span><span class="special">>&</span> <span class="identifier">val</span><span class="special">,</span>
- <span class="identifier">ForwardIterator</span> <span class="identifier">i</span><span class="special">,</span>
- <span class="identifier">ForwardIterator</span> <span class="identifier">j</span><span class="special">,</span>
- <span class="keyword">unsigned</span> <span class="identifier">chunk_size</span> <span class="special">=</span> <span class="number">0</span><span class="special">,</span>
- <span class="keyword">bool</span> <span class="identifier">msv_first</span> <span class="special">=</span> <span class="keyword">true</span><span class="special">);</span>
- </pre>
- <p>
- Imports bits from the iterator range <span class="emphasis"><em>[i,j)</em></span> and stores
- them in <code class="computeroutput"><span class="identifier">val</span></code> to produce an
- unsigned result (if the result is to be signed you will need to handle that
- separately). When <code class="computeroutput"><span class="identifier">msv_first</span></code>
- is true, takes <code class="computeroutput"><span class="special">*</span><span class="identifier">i</span></code>
- as the most significant chunk. Assumes there are <code class="computeroutput"><span class="identifier">chunk_size</span></code>
- bits in each value read from the iterator range, and that these are in machine
- native bit/byte order. When <code class="computeroutput"><span class="identifier">chunk_size</span></code>
- is zero, then assumes that each chunk contains <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">numeric_limits</span><span class="special"><</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">iterator_traits</span><span class="special"><</span><span class="identifier">ForwardIterator</span><span class="special">>::</span><span class="identifier">value_type</span><span class="special">>::</span><span class="identifier">digits</span></code>,
- note that this will give the wrong result if dereferencing the iterators
- leads to a signed-integer type, <span class="bold"><strong>and</strong></span> the
- sign bit is significant (be particularly careful if you expect type <code class="computeroutput"><span class="keyword">char</span></code> to contain 8-bit values, as by default
- it will extract only 7-bits at a time if <code class="computeroutput"><span class="keyword">char</span></code>
- is signed). As with exporting, if the external data is to be in a non-native
- byte order (within each chunk), then you will need to create an iterator
- adaptor that presents it in native order (see <a href="http://www.boost.org/doc/libs/release/libs/endian/doc/index.html" target="_top">Boost.Endian</a>).
- </p>
- <div class="note"><table border="0" summary="Note">
- <tr>
- <td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../../../../doc/src/images/note.png"></td>
- <th align="left">Note</th>
- </tr>
- <tr><td align="left" valign="top"><p>
- Note that this function is optimized for the case where the data can be
- <code class="computeroutput"><span class="identifier">memcpy</span></code>ed from the source
- to the integer - in this case both iterators much be pointers, and everything
- must be little-endian.
- </p></td></tr>
- </table></div>
- <h5>
- <a name="boost_multiprecision.tut.import_export.h0"></a>
- <span class="phrase"><a name="boost_multiprecision.tut.import_export.examples"></a></span><a class="link" href="import_export.html#boost_multiprecision.tut.import_export.examples">Examples</a>
- </h5>
- <p>
- In this simple example, we'll import/export the bits of a cpp_int to a vector
- of 8-bit unsigned values:
- </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">multiprecision</span><span class="special">/</span><span class="identifier">cpp_int</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span>
- <span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">iostream</span><span class="special">></span>
- <span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">iomanip</span><span class="special">></span>
- <span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">vector</span><span class="special">></span>
- <span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">iterator</span><span class="special">></span>
- <span class="keyword">int</span> <span class="identifier">main</span><span class="special">()</span>
- <span class="special">{</span>
- <span class="keyword">using</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">multiprecision</span><span class="special">::</span><span class="identifier">cpp_int</span><span class="special">;</span>
- <span class="comment">// Create a cpp_int with just a couple of bits set:</span>
- <span class="identifier">cpp_int</span> <span class="identifier">i</span><span class="special">;</span>
- <span class="identifier">bit_set</span><span class="special">(</span><span class="identifier">i</span><span class="special">,</span> <span class="number">5000</span><span class="special">);</span> <span class="comment">// set the 5000'th bit</span>
- <span class="identifier">bit_set</span><span class="special">(</span><span class="identifier">i</span><span class="special">,</span> <span class="number">200</span><span class="special">);</span>
- <span class="identifier">bit_set</span><span class="special">(</span><span class="identifier">i</span><span class="special">,</span> <span class="number">50</span><span class="special">);</span>
- <span class="comment">// export into 8-bit unsigned values, most significant bit first:</span>
- <span class="identifier">std</span><span class="special">::</span><span class="identifier">vector</span><span class="special"><</span><span class="keyword">unsigned</span> <span class="keyword">char</span><span class="special">></span> <span class="identifier">v</span><span class="special">;</span>
- <span class="identifier">export_bits</span><span class="special">(</span><span class="identifier">i</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">back_inserter</span><span class="special">(</span><span class="identifier">v</span><span class="special">),</span> <span class="number">8</span><span class="special">);</span>
- <span class="comment">// import back again, and check for equality:</span>
- <span class="identifier">cpp_int</span> <span class="identifier">j</span><span class="special">;</span>
- <span class="identifier">import_bits</span><span class="special">(</span><span class="identifier">j</span><span class="special">,</span> <span class="identifier">v</span><span class="special">.</span><span class="identifier">begin</span><span class="special">(),</span> <span class="identifier">v</span><span class="special">.</span><span class="identifier">end</span><span class="special">());</span>
- <span class="identifier">BOOST_ASSERT</span><span class="special">(</span><span class="identifier">i</span> <span class="special">==</span> <span class="identifier">j</span><span class="special">);</span>
- <span class="special">}</span>
- </pre>
- <p>
- Importing or exporting cpp_bin_float is similar, but we must procede via
- an intermediate integer:
- </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">multiprecision</span><span class="special">/</span><span class="identifier">cpp_bin_float</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span>
- <span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">iostream</span><span class="special">></span>
- <span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">iomanip</span><span class="special">></span>
- <span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">vector</span><span class="special">></span>
- <span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">iterator</span><span class="special">></span>
- <span class="keyword">int</span> <span class="identifier">main</span><span class="special">()</span>
- <span class="special">{</span>
- <span class="keyword">using</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">multiprecision</span><span class="special">::</span><span class="identifier">cpp_bin_float_100</span><span class="special">;</span>
- <span class="keyword">using</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">multiprecision</span><span class="special">::</span><span class="identifier">cpp_int</span><span class="special">;</span>
- <span class="comment">// Create a cpp_bin_float to import/export:</span>
- <span class="identifier">cpp_bin_float_100</span> <span class="identifier">f</span><span class="special">(</span><span class="number">1</span><span class="special">);</span>
- <span class="identifier">f</span> <span class="special">/=</span> <span class="number">3</span><span class="special">;</span>
- <span class="comment">// export into 8-bit unsigned values, most significant bit first:</span>
- <span class="identifier">std</span><span class="special">::</span><span class="identifier">vector</span><span class="special"><</span><span class="keyword">unsigned</span> <span class="keyword">char</span><span class="special">></span> <span class="identifier">v</span><span class="special">;</span>
- <span class="identifier">export_bits</span><span class="special">(</span><span class="identifier">cpp_int</span><span class="special">(</span><span class="identifier">f</span><span class="special">.</span><span class="identifier">backend</span><span class="special">().</span><span class="identifier">bits</span><span class="special">()),</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">back_inserter</span><span class="special">(</span><span class="identifier">v</span><span class="special">),</span> <span class="number">8</span><span class="special">);</span>
- <span class="comment">// Grab the exponent as well:</span>
- <span class="keyword">int</span> <span class="identifier">e</span> <span class="special">=</span> <span class="identifier">f</span><span class="special">.</span><span class="identifier">backend</span><span class="special">().</span><span class="identifier">exponent</span><span class="special">();</span>
- <span class="comment">// Import back again, and check for equality, we have to procede via</span>
- <span class="comment">// an intermediate integer:</span>
- <span class="identifier">cpp_int</span> <span class="identifier">i</span><span class="special">;</span>
- <span class="identifier">import_bits</span><span class="special">(</span><span class="identifier">i</span><span class="special">,</span> <span class="identifier">v</span><span class="special">.</span><span class="identifier">begin</span><span class="special">(),</span> <span class="identifier">v</span><span class="special">.</span><span class="identifier">end</span><span class="special">());</span>
- <span class="identifier">cpp_bin_float_100</span> <span class="identifier">g</span><span class="special">(</span><span class="identifier">i</span><span class="special">);</span>
- <span class="identifier">g</span><span class="special">.</span><span class="identifier">backend</span><span class="special">().</span><span class="identifier">exponent</span><span class="special">()</span> <span class="special">=</span> <span class="identifier">e</span><span class="special">;</span>
- <span class="identifier">BOOST_ASSERT</span><span class="special">(</span><span class="identifier">f</span> <span class="special">==</span> <span class="identifier">g</span><span class="special">);</span>
- <span class="special">}</span>
- </pre>
- </div>
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- <td align="right"><div class="copyright-footer">Copyright © 2002-2019 John Maddock
- and Christopher Kormanyos<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>)
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