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| </div> |
| <div class="section"> |
| <div class="titlepage"><div><div><h5 class="title"> |
| <a name="spirit.qi.reference.stream.stream"></a><a class="link" href="stream.html" title="Stream (stream, wstream, etc.)">Stream (<code class="computeroutput"><span class="identifier">stream</span></code>, <code class="computeroutput"><span class="identifier">wstream</span></code>, |
| etc.)</a> |
| </h5></div></div></div> |
| <a name="spirit.qi.reference.stream.stream.description"></a><h6> |
| <a name="id944734"></a> |
| <a class="link" href="stream.html#spirit.qi.reference.stream.stream.description">Description</a> |
| </h6> |
| <p> |
| The <code class="computeroutput"><span class="identifier">stream_parser</span></code> is |
| a primitive which allows to use pre-existing standard streaming operators |
| for input parsing integrated with <span class="emphasis"><em>Spirit.Qi</em></span>. It |
| provides a wrapper parser dispatching the underlying input stream to |
| the stream operator of the corresponding attribute type to be parsed. |
| Any value <code class="computeroutput"><span class="identifier">a</span></code> to be parsed |
| using the <code class="computeroutput"><span class="identifier">stream_parser</span></code> |
| will result in invoking the standard streaming operator for its type |
| <code class="computeroutput"><span class="identifier">A</span></code>, for instance: |
| </p> |
| <pre class="programlisting"><span class="identifier">std</span><span class="special">::</span><span class="identifier">istream</span><span class="special">&</span> <span class="keyword">operator</span><span class="special">>></span> <span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">istream</span><span class="special">&,</span> <span class="identifier">A</span><span class="special">&);</span> |
| </pre> |
| <a name="spirit.qi.reference.stream.stream.header"></a><h6> |
| <a name="id945932"></a> |
| <a class="link" href="stream.html#spirit.qi.reference.stream.stream.header">Header</a> |
| </h6> |
| <pre class="programlisting"><span class="comment">// forwards to <boost/spirit/home/qi/stream.hpp> |
| </span><span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">spirit</span><span class="special">/</span><span class="identifier">include</span><span class="special">/</span><span class="identifier">qi_stream</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span> |
| </pre> |
| <p> |
| Also, see <a class="link" href="../../../structure/include.html" title="Include">Include Structure</a>. |
| </p> |
| <a name="spirit.qi.reference.stream.stream.namespace"></a><h6> |
| <a name="id946006"></a> |
| <a class="link" href="stream.html#spirit.qi.reference.stream.stream.namespace">Namespace</a> |
| </h6> |
| <div class="informaltable"><table class="table"> |
| <colgroup><col></colgroup> |
| <thead><tr><th> |
| <p> |
| Name |
| </p> |
| </th></tr></thead> |
| <tbody> |
| <tr><td> |
| <p> |
| <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">spirit</span><span class="special">::</span><span class="identifier">stream</span> <span class="comment">// |
| alias: boost::spirit::qi::stream</span></code> |
| </p> |
| </td></tr> |
| <tr><td> |
| <p> |
| <code class="computeroutput"><span class="identifier">boost</span><span class="special">::</span><span class="identifier">spirit</span><span class="special">::</span><span class="identifier">wstream</span> <span class="comment">// |
| alias: boost::spirit::qi::wstream</span></code> |
| </p> |
| </td></tr> |
| </tbody> |
| </table></div> |
| <a name="spirit.qi.reference.stream.stream.synopsis"></a><h6> |
| <a name="id946124"></a> |
| <a class="link" href="stream.html#spirit.qi.reference.stream.stream.synopsis">Synopsis</a> |
| </h6> |
| <pre class="programlisting"><span class="keyword">template</span> <span class="special"><</span><span class="keyword">typename</span> <span class="identifier">Char</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">Attrib</span><span class="special">></span> |
| <span class="keyword">struct</span> <span class="identifier">stream_parser</span><span class="special">;</span> |
| </pre> |
| <a name="spirit.qi.reference.stream.stream.template_parameters"></a><h6> |
| <a name="id946188"></a> |
| <a class="link" href="stream.html#spirit.qi.reference.stream.stream.template_parameters">Template |
| parameters</a> |
| </h6> |
| <div class="informaltable"><table class="table"> |
| <colgroup> |
| <col> |
| <col> |
| <col> |
| </colgroup> |
| <thead><tr> |
| <th> |
| <p> |
| Parameter |
| </p> |
| </th> |
| <th> |
| <p> |
| Description |
| </p> |
| </th> |
| <th> |
| <p> |
| Default |
| </p> |
| </th> |
| </tr></thead> |
| <tbody> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="identifier">Char</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| The character type to use to generate the input. This type |
| will be used while assigning the generated characters to the |
| underlying input iterator. |
| </p> |
| </td> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="keyword">char</span></code> |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="identifier">Attrib</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| The type of the attribute the <code class="computeroutput"><span class="identifier">stream_parser</span></code> |
| is expected to parse its input into. |
| </p> |
| </td> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="identifier">spirit</span><span class="special">::</span><span class="identifier">hold_any</span></code> |
| </p> |
| </td> |
| </tr> |
| </tbody> |
| </table></div> |
| <a name="spirit.qi.reference.stream.stream.model_of"></a><h6> |
| <a name="id946337"></a> |
| <a class="link" href="stream.html#spirit.qi.reference.stream.stream.model_of">Model of</a> |
| </h6> |
| <div class="blockquote"><blockquote class="blockquote"><p> |
| <a class="link" href="../parser_concepts/primitiveparser.html" title="PrimitiveParser"><code class="computeroutput"><span class="identifier">PrimitiveParser</span></code></a> |
| </p></blockquote></div> |
| <div class="variablelist"> |
| <p class="title"><b>Notation</b></p> |
| <dl> |
| <dt><span class="term"><code class="computeroutput"><span class="identifier">s</span></code></span></dt> |
| <dd><p> |
| A variable instance of any type with a defined matching streaming |
| <code class="computeroutput"><span class="keyword">operator</span><span class="special">>>()</span></code> |
| or a <a class="link" href="../basics.html#spirit.qi.reference.basics.lazy_argument">Lazy |
| Argument</a> that evaluates to any type with a defined matching |
| streaming <code class="computeroutput"><span class="keyword">operator</span><span class="special">>>()</span></code>. |
| </p></dd> |
| </dl> |
| </div> |
| <a name="spirit.qi.reference.stream.stream.expression_semantics"></a><h6> |
| <a name="id946420"></a> |
| <a class="link" href="stream.html#spirit.qi.reference.stream.stream.expression_semantics">Expression |
| Semantics</a> |
| </h6> |
| <p> |
| Semantics of an expression is defined only where it differs from, or |
| is not defined in <a class="link" href="../parser_concepts/primitiveparser.html" title="PrimitiveParser"><code class="computeroutput"><span class="identifier">PrimitiveParser</span></code></a>. |
| </p> |
| <div class="informaltable"><table class="table"> |
| <colgroup> |
| <col> |
| <col> |
| </colgroup> |
| <thead><tr> |
| <th> |
| <p> |
| Expression |
| </p> |
| </th> |
| <th> |
| <p> |
| Description |
| </p> |
| </th> |
| </tr></thead> |
| <tbody> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="identifier">stream</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| Call the streaming <code class="computeroutput"><span class="keyword">operator</span><span class="special">>>()</span></code> for the type of the |
| mandatory attribute. The input recognized by this operator |
| will be the result of the <code class="computeroutput"><span class="identifier">stream</span></code> |
| parser. This parser never fails (unless the underlying input |
| stream reports an error). The character type of the I/O istream |
| is assumed to be <code class="computeroutput"><span class="keyword">char</span></code>. |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="identifier">wstream</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| Call the streaming <code class="computeroutput"><span class="keyword">operator</span><span class="special">>>()</span></code> for the type of the |
| mandatory attribute. The input recognized by this operator |
| will be the result of the <code class="computeroutput"><span class="identifier">wstream</span></code> |
| parser. This parser never fails (unless the underlying input |
| stream reports an error). The character type of the I/O istream |
| is assumed to be <code class="computeroutput"><span class="keyword">wchar_t</span></code>. |
| </p> |
| </td> |
| </tr> |
| </tbody> |
| </table></div> |
| <p> |
| All parsers listed in the table above are predefined specializations |
| of the <code class="computeroutput"><span class="identifier">stream_parser</span><span class="special"><</span><span class="identifier">Char</span><span class="special">></span></code> basic stream parser type described |
| below. It is possible to directly use this type to create stream parsers |
| using an arbitrary underlying character type. |
| </p> |
| <div class="informaltable"><table class="table"> |
| <colgroup> |
| <col> |
| <col> |
| </colgroup> |
| <thead><tr> |
| <th> |
| <p> |
| Expression |
| </p> |
| </th> |
| <th> |
| <p> |
| Semantics |
| </p> |
| </th> |
| </tr></thead> |
| <tbody><tr> |
| <td> |
| <p> |
| |
| </p> |
| <pre xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="table-programlisting"><span class="identifier">stream_parser</span><span class="special"><</span> |
| <span class="identifier">Char</span><span class="special">,</span> <span class="identifier">Attrib</span> |
| <span class="special">>()</span></pre> |
| <p> |
| </p> |
| </td> |
| <td> |
| <p> |
| Call the streaming <code class="computeroutput"><span class="keyword">operator</span><span class="special">>>()</span></code> for the type of the |
| optional attribute, <code class="computeroutput"><span class="identifier">Attrib</span></code>. |
| The input recognized by this operator will be the result of |
| the <code class="computeroutput"><span class="identifier">stream_parser</span><span class="special"><></span></code> parser. This parser |
| never fails (unless the underlying input stream reports an |
| error). The character type of the I/O istream is assumed to |
| be <code class="computeroutput"><span class="identifier">Char</span></code> |
| </p> |
| </td> |
| </tr></tbody> |
| </table></div> |
| <a name="spirit.qi.reference.stream.stream.additional_requirements"></a><h6> |
| <a name="id946725"></a> |
| <a class="link" href="stream.html#spirit.qi.reference.stream.stream.additional_requirements">Additional |
| Requirements</a> |
| </h6> |
| <p> |
| All of the stream parsers listed above require the type of the value |
| to parse (the associated attribute) to implement a streaming operator |
| conforming to the usual I/O streams conventions (where <code class="computeroutput"><span class="identifier">attribute_type</span></code> is the type of the value |
| to recognize while parse): |
| </p> |
| <pre class="programlisting"><span class="keyword">template</span> <span class="special"><</span><span class="keyword">typename</span> <span class="identifier">Istream</span><span class="special">></span> |
| <span class="identifier">Istream</span><span class="special">&</span> <span class="keyword">operator</span><span class="special">>></span> <span class="special">(</span><span class="identifier">Istream</span><span class="special">&</span> <span class="identifier">os</span><span class="special">,</span> <span class="identifier">attribute_type</span><span class="special">&</span> <span class="identifier">attr</span><span class="special">)</span> |
| <span class="special">{</span> |
| <span class="comment">// type specific input parsing |
| </span> <span class="keyword">return</span> <span class="identifier">os</span><span class="special">;</span> |
| <span class="special">}</span> |
| </pre> |
| <p> |
| This operator will be called by the stream parsers to gather the input |
| for the attribute of type <code class="computeroutput"><span class="identifier">attribute_type</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="../../../../images/note.png"></td> |
| <th align="left">Note</th> |
| </tr> |
| <tr><td align="left" valign="top"><p> |
| If the <code class="computeroutput"><span class="identifier">stream</span></code> parser |
| is invoked inside a <a class="link" href="../parse_api/stream_api.html" title="Stream Based Parser API"><code class="computeroutput"><span class="identifier">match</span></code></a> (or <a class="link" href="../parse_api/stream_api.html" title="Stream Based Parser API"><code class="computeroutput"><span class="identifier">phrase_match</span></code></a>) stream manipulator |
| the <code class="computeroutput"><span class="identifier">Istream</span></code> passed |
| to the <code class="computeroutput"><span class="keyword">operator</span><span class="special">>>()</span></code> |
| will have registered (imbued) the same standard locale instance as |
| the stream the <a class="link" href="../parse_api/stream_api.html" title="Stream Based Parser API"><code class="computeroutput"><span class="identifier">match</span></code></a> (or <a class="link" href="../parse_api/stream_api.html" title="Stream Based Parser API"><code class="computeroutput"><span class="identifier">phrase_match</span></code></a>) manipulator |
| has been used with. This ensures all facets registered (imbued) with |
| the original I/O stream object are used during input parsing. |
| </p></td></tr> |
| </table></div> |
| <a name="spirit.qi.reference.stream.stream.attributes"></a><h6> |
| <a name="id946940"></a> |
| <a class="link" href="stream.html#spirit.qi.reference.stream.stream.attributes">Attributes</a> |
| </h6> |
| <div class="informaltable"><table class="table"> |
| <colgroup> |
| <col> |
| <col> |
| </colgroup> |
| <thead><tr> |
| <th> |
| <p> |
| Expression |
| </p> |
| </th> |
| <th> |
| <p> |
| Attribute |
| </p> |
| </th> |
| </tr></thead> |
| <tbody> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="identifier">stream</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="identifier">spirit</span><span class="special">::</span><span class="identifier">hold_any</span></code> |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="identifier">wstream</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="identifier">spirit</span><span class="special">::</span><span class="identifier">hold_any</span></code> |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="identifier">stream_parser</span><span class="special"><</span><span class="identifier">Char</span><span class="special">,</span> <span class="identifier">Attrib</span><span class="special">>()</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="identifier">Attrib</span></code> |
| </p> |
| </td> |
| </tr> |
| </tbody> |
| </table></div> |
| <div class="important"><table border="0" summary="Important"> |
| <tr> |
| <td rowspan="2" align="center" valign="top" width="25"><img alt="[Important]" src="../../../../images/important.png"></td> |
| <th align="left">Important</th> |
| </tr> |
| <tr><td align="left" valign="top"><p> |
| The attribute type <code class="computeroutput"><span class="identifier">spirit</span><span class="special">::</span><span class="identifier">hold_any</span></code> |
| exposed by some of the stream parsers is semantically and syntactically |
| equivalent to the type implemented by <a href="../../../../../../../../libs/any/index.html" target="_top">Boost.Any</a>. |
| It has been added to <span class="emphasis"><em>Spirit</em></span> as it has better performance |
| and a smaller footprint than <a href="../../../../../../../../libs/any/index.html" target="_top">Boost.Any</a>. |
| </p></td></tr> |
| </table></div> |
| <a name="spirit.qi.reference.stream.stream.complexity"></a><h6> |
| <a name="id947153"></a> |
| <a class="link" href="stream.html#spirit.qi.reference.stream.stream.complexity">Complexity</a> |
| </h6> |
| <div class="blockquote"><blockquote class="blockquote"><p> |
| O(N), where N is the number of characters consumed by the stream parser |
| </p></blockquote></div> |
| <a name="spirit.qi.reference.stream.stream.example"></a><h6> |
| <a name="id947174"></a> |
| <a class="link" href="stream.html#spirit.qi.reference.stream.stream.example">Example</a> |
| </h6> |
| <div class="note"><table border="0" summary="Note"> |
| <tr> |
| <td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../../images/note.png"></td> |
| <th align="left">Note</th> |
| </tr> |
| <tr><td align="left" valign="top"><p> |
| The test harness for the example(s) below is presented in the <a class="link" href="../basics.html#spirit.qi.reference.basics.examples">Basics Examples</a> |
| section. |
| </p></td></tr> |
| </table></div> |
| <p> |
| A class definition used in the examples: |
| </p> |
| <p> |
| |
| </p> |
| <pre class="programlisting"><span class="comment">// a simple complex number representation z = a + bi |
| </span><span class="keyword">struct</span> <span class="identifier">complex</span> |
| <span class="special">{</span> |
| <span class="identifier">complex</span> <span class="special">(</span><span class="keyword">double</span> <span class="identifier">a</span> <span class="special">=</span> <span class="number">0.0</span><span class="special">,</span> <span class="keyword">double</span> <span class="identifier">b</span> <span class="special">=</span> <span class="number">0.0</span><span class="special">)</span> |
| <span class="special">:</span> <span class="identifier">a</span><span class="special">(</span><span class="identifier">a</span><span class="special">),</span> <span class="identifier">b</span><span class="special">(</span><span class="identifier">b</span><span class="special">)</span> |
| <span class="special">{}</span> |
| |
| <span class="keyword">double</span> <span class="identifier">a</span><span class="special">;</span> |
| <span class="keyword">double</span> <span class="identifier">b</span><span class="special">;</span> |
| <span class="special">};</span> |
| </pre> |
| <p> |
| </p> |
| <p> |
| |
| </p> |
| <pre class="programlisting"><span class="comment">// define streaming operator for the type complex |
| </span><span class="identifier">std</span><span class="special">::</span><span class="identifier">istream</span><span class="special">&</span> |
| <span class="keyword">operator</span><span class="special">>></span> <span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">istream</span><span class="special">&</span> <span class="identifier">is</span><span class="special">,</span> <span class="identifier">complex</span><span class="special">&</span> <span class="identifier">z</span><span class="special">)</span> |
| <span class="special">{</span> |
| <span class="keyword">char</span> <span class="identifier">lbrace</span> <span class="special">=</span> <span class="char">'\0'</span><span class="special">,</span> <span class="identifier">comma</span> <span class="special">=</span> <span class="char">'\0'</span><span class="special">,</span> <span class="identifier">rbrace</span> <span class="special">=</span> <span class="char">'\0'</span><span class="special">;</span> |
| <span class="identifier">is</span> <span class="special">>></span> <span class="identifier">lbrace</span> <span class="special">>></span> <span class="identifier">z</span><span class="special">.</span><span class="identifier">a</span> <span class="special">>></span> <span class="identifier">comma</span> <span class="special">>></span> <span class="identifier">z</span><span class="special">.</span><span class="identifier">b</span> <span class="special">>></span> <span class="identifier">rbrace</span><span class="special">;</span> |
| <span class="keyword">if</span> <span class="special">(</span><span class="identifier">lbrace</span> <span class="special">!=</span> <span class="char">'{'</span> <span class="special">||</span> <span class="identifier">comma</span> <span class="special">!=</span> <span class="char">','</span> <span class="special">||</span> <span class="identifier">rbrace</span> <span class="special">!=</span> <span class="char">'}'</span><span class="special">)</span> |
| <span class="identifier">is</span><span class="special">.</span><span class="identifier">setstate</span><span class="special">(</span><span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span><span class="special">::</span><span class="identifier">failbit</span><span class="special">);</span> |
| <span class="keyword">return</span> <span class="identifier">is</span><span class="special">;</span> |
| <span class="special">}</span> |
| </pre> |
| <p> |
| </p> |
| <p> |
| Using declarations and variables: |
| </p> |
| <p> |
| |
| </p> |
| <pre class="programlisting"><span class="keyword">using</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">spirit</span><span class="special">::</span><span class="identifier">qi</span><span class="special">::</span><span class="identifier">stream</span><span class="special">;</span> |
| <span class="keyword">using</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">spirit</span><span class="special">::</span><span class="identifier">qi</span><span class="special">::</span><span class="identifier">stream_parser</span><span class="special">;</span></pre> |
| <p> |
| </p> |
| <p> |
| Parse a simple string using the operator>>(istream&, std::string&); |
| </p> |
| <p> |
| |
| </p> |
| <pre class="programlisting"><span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span> <span class="identifier">str</span><span class="special">;</span> |
| <span class="identifier">test_parser_attr</span><span class="special">(</span><span class="string">"abc"</span><span class="special">,</span> <span class="identifier">stream</span><span class="special">,</span> <span class="identifier">str</span><span class="special">);</span> |
| <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special"><<</span> <span class="identifier">str</span> <span class="special"><<</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span> <span class="comment">// prints: abc</span></pre> |
| <p> |
| </p> |
| <p> |
| Parse our complex type using the operator>>(istream&, complex&); |
| </p> |
| <p> |
| |
| </p> |
| <pre class="programlisting"><span class="identifier">complex</span> <span class="identifier">c</span><span class="special">;</span> |
| <span class="identifier">test_parser_attr</span><span class="special">(</span><span class="string">"{1.0,2.5}"</span><span class="special">,</span> <span class="identifier">stream_parser</span><span class="special"><</span><span class="keyword">char</span><span class="special">,</span> <span class="identifier">complex</span><span class="special">>(),</span> <span class="identifier">c</span><span class="special">);</span> |
| <span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special"><<</span> <span class="identifier">c</span><span class="special">.</span><span class="identifier">a</span> <span class="special"><<</span> <span class="string">","</span> <span class="special"><<</span> <span class="identifier">c</span><span class="special">.</span><span class="identifier">b</span> <span class="special"><<</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span> <span class="comment">// prints: 1.0,2.5 |
| </span></pre> |
| <p> |
| </p> |
| </div> |
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| <td align="right"><div class="copyright-footer">Copyright © 2001-2010 Joel de Guzman, Hartmut Kaiser<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> |
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