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- <title>The MPL Reference Manual: shift_left</title>
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- <div class="section" id="shift-left">
- <h1><a class="toc-backref" href="./bitwise-operations.html#id1557">shift_left</a></h1>
- <div class="section" id="id1116">
- <h3><a class="subsection-title" href="#synopsis" name="synopsis">Synopsis</a></h3>
- <pre class="literal-block">
- template<
- typename T
- , typename Shift
- >
- struct <a href="./shift-left.html" class="identifier">shift_left</a>
- {
- typedef <em>unspecified</em> type;
- };
- </pre>
- </div>
- <div class="section" id="id1117">
- <h3><a class="subsection-title" href="#description" name="description">Description</a></h3>
- <p>Returns the result of bitwise <em>shift left</em> (<tt class="literal"><span class="pre"><<</span></tt>) operation on <tt class="literal"><span class="pre">T</span></tt>.</p>
- </div>
- <div class="section" id="id1118">
- <h3><a class="subsection-title" href="#header" name="header">Header</a></h3>
- <pre class="literal-block">
- #include <<a href="../../../../boost/mpl/shift_left.hpp" class="header">boost/mpl/shift_left.hpp</a>>
- #include <<a href="../../../../boost/mpl/bitwise.hpp" class="header">boost/mpl/bitwise.hpp</a>>
- </pre>
- </div>
- <div class="section" id="id1119">
- <h3><a class="subsection-title" href="#model-of" name="model-of">Model of</a></h3>
- <p><a class="reference internal" href="./numeric-metafunction.html">Numeric Metafunction</a></p>
- </div>
- <div class="section" id="id1120">
- <h3><a class="subsection-title" href="#parameters" name="parameters">Parameters</a></h3>
- <table border="1" class="docutils table">
- <colgroup>
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- <col width="42%" />
- <col width="37%" />
- </colgroup>
- <thead valign="bottom">
- <tr><th class="head">Parameter</th>
- <th class="head">Requirement</th>
- <th class="head">Description</th>
- </tr>
- </thead>
- <tbody valign="top">
- <tr><td><tt class="literal"><span class="pre">T</span></tt></td>
- <td><a class="reference internal" href="./integral-constant.html">Integral Constant</a></td>
- <td>A value to shift.</td>
- </tr>
- <tr><td><tt class="literal"><span class="pre">Shift</span></tt></td>
- <td>Unsigned <a class="reference internal" href="./integral-constant.html">Integral Constant</a></td>
- <td>A shift distance.</td>
- </tr>
- </tbody>
- </table>
- <p>[<em>Note:</em> The requirements listed in this specification
- are the ones imposed by the default implementation. See <a class="reference internal" href="./numeric-metafunction.html">Numeric Metafunction</a> concept
- for the details on how to provide an implementation for a user-defined numeric type
- that does not satisfy the <a class="reference internal" href="./integral-constant.html">Integral Constant</a> requirements. — <em>end note</em>]</p>
- </div>
- <div class="section" id="id1121">
- <h3><a class="subsection-title" href="#expression-semantics" name="expression-semantics">Expression semantics</a></h3>
- <p>For arbitrary <a class="reference internal" href="./integral-constant.html">Integral Constant</a> <tt class="literal"><span class="pre">c</span></tt> and unsigned <a class="reference internal" href="./integral-constant.html">Integral Constant</a> <tt class="literal"><span class="pre">shift</span></tt>:</p>
- <pre class="literal-block">
- typedef <a href="./shift-left.html" class="identifier">shift_left</a><c,shift>::type r;
- </pre>
- <table class="docutils field-list" frame="void" rules="none">
- <col class="field-name" />
- <col class="field-body" />
- <tbody valign="top">
- <tr class="field"><th class="field-name">Return type:</th><td class="field-body"><p class="first"><a class="reference internal" href="./integral-constant.html">Integral Constant</a>.</p>
- </td>
- </tr>
- <tr class="field"><th class="field-name">Semantics:</th><td class="field-body"><p class="first">Equivalent to</p>
- <pre class="last literal-block">
- typedef <a href="./integral-c.html" class="identifier">integral_c</a><
- c::<a href="./value-type.html" class="identifier">value_type</a>
- , ( c::value << shift::value )
- > r;
- </pre>
- </td>
- </tr>
- </tbody>
- </table>
- <!-- .......................................................................... -->
- <pre class="literal-block">
- typedef <a href="./shift-left.html" class="identifier">shift_left</a><c,shift> r;
- </pre>
- <table class="docutils field-list" frame="void" rules="none">
- <col class="field-name" />
- <col class="field-body" />
- <tbody valign="top">
- <tr class="field"><th class="field-name">Return type:</th><td class="field-body"><p class="first"><a class="reference internal" href="./integral-constant.html">Integral Constant</a>.</p>
- </td>
- </tr>
- <tr class="field"><th class="field-name">Semantics:</th><td class="field-body"><p class="first">Equivalent to</p>
- <pre class="last literal-block">
- struct r : <a href="./shift-left.html" class="identifier">shift_left</a><c,shift>::type {};
- </pre>
- </td>
- </tr>
- </tbody>
- </table>
- </div>
- <div class="section" id="id1122">
- <h3><a class="subsection-title" href="#complexity" name="complexity">Complexity</a></h3>
- <p>Amortized constant time.</p>
- </div>
- <div class="section" id="id1123">
- <h3><a class="subsection-title" href="#example" name="example">Example</a></h3>
- <pre class="literal-block">
- typedef <a href="./integral-c.html" class="identifier">integral_c</a><unsigned,0> u0;
- typedef <a href="./integral-c.html" class="identifier">integral_c</a><unsigned,1> u1;
- typedef <a href="./integral-c.html" class="identifier">integral_c</a><unsigned,2> u2;
- typedef <a href="./integral-c.html" class="identifier">integral_c</a><unsigned,8> u8;
- <a href="./assert-relation.html" class="identifier">BOOST_MPL_ASSERT_RELATION</a>( (<a href="./shift-left.html" class="identifier">shift_left</a><u0,u0>::value), ==, 0 );
- <a href="./assert-relation.html" class="identifier">BOOST_MPL_ASSERT_RELATION</a>( (<a href="./shift-left.html" class="identifier">shift_left</a><u1,u0>::value), ==, 1 );
- <a href="./assert-relation.html" class="identifier">BOOST_MPL_ASSERT_RELATION</a>( (<a href="./shift-left.html" class="identifier">shift_left</a><u1,u1>::value), ==, 2 );
- <a href="./assert-relation.html" class="identifier">BOOST_MPL_ASSERT_RELATION</a>( (<a href="./shift-left.html" class="identifier">shift_left</a><u2,u1>::value), ==, 4 );
- <a href="./assert-relation.html" class="identifier">BOOST_MPL_ASSERT_RELATION</a>( (<a href="./shift-left.html" class="identifier">shift_left</a><u8,u1>::value), ==, 16 );
- </pre>
- </div>
- <div class="section" id="id1124">
- <h3><a class="subsection-title" href="#see-also" name="see-also">See also</a></h3>
- <p><a class="reference internal" href="./bitwise-operations.html">Bitwise Operations</a>, <a class="reference internal" href="./numeric-metafunction.html">Numeric Metafunction</a>, <a class="reference internal" href="./numeric-cast.html">numeric_cast</a>, <a class="reference internal" href="./shift-right.html">shift_right</a>, <a class="reference internal" href="./bitand.html">bitand_</a></p>
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