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| <div class="section"> |
| <div class="titlepage"><div><div><h5 class="title"> |
| <a name="spirit.qi.reference.char.char"></a><a class="link" href="char.html" title="Char (char_, lit)">Char (<code class="computeroutput"><span class="identifier">char_</span></code>, <code class="computeroutput"><span class="identifier">lit</span></code>)</a> |
| </h5></div></div></div> |
| <a name="spirit.qi.reference.char.char.description"></a><h6> |
| <a name="id878139"></a> |
| <a class="link" href="char.html#spirit.qi.reference.char.char.description">Description</a> |
| </h6> |
| <p> |
| The <code class="computeroutput"><span class="identifier">char_</span></code> parser matches |
| single characters. The <code class="computeroutput"><span class="identifier">char_</span></code> |
| parser has an associated <a class="link" href="../basics.html#spirit.qi.reference.basics.character_encoding_namespace">Character |
| Encoding Namespace</a>. This is needed when doing basic operations |
| such as inhibiting case sensitivity and dealing with character ranges. |
| </p> |
| <p> |
| There are various forms of <code class="computeroutput"><span class="identifier">char_</span></code>. |
| </p> |
| <a name="spirit.qi.reference.char.char.char_"></a><h6> |
| <a name="id878185"></a> |
| <a class="link" href="char.html#spirit.qi.reference.char.char.char_">char_</a> |
| </h6> |
| <p> |
| The no argument form of <code class="computeroutput"><span class="identifier">char_</span></code> |
| matches any character in the associated <a class="link" href="../basics.html#spirit.qi.reference.basics.character_encoding_namespace">Character |
| Encoding Namespace</a>. |
| </p> |
| <pre class="programlisting"><span class="identifier">char_</span> <span class="comment">// matches any character |
| </span></pre> |
| <a name="spirit.qi.reference.char.char.char__ch_"></a><h6> |
| <a name="id878226"></a> |
| <a class="link" href="char.html#spirit.qi.reference.char.char.char__ch_">char_(ch)</a> |
| </h6> |
| <p> |
| The single argument form of <code class="computeroutput"><span class="identifier">char_</span></code> |
| (with a character argument) matches the supplied character. |
| </p> |
| <pre class="programlisting"><span class="identifier">char_</span><span class="special">(</span><span class="char">'x'</span><span class="special">)</span> <span class="comment">// matches 'x' |
| </span><span class="identifier">char_</span><span class="special">(</span><span class="identifier">L</span><span class="char">'x'</span><span class="special">)</span> <span class="comment">// matches L'x' |
| </span><span class="identifier">char_</span><span class="special">(</span><span class="identifier">x</span><span class="special">)</span> <span class="comment">// matches x (a char) |
| </span></pre> |
| <a name="spirit.qi.reference.char.char.char__first__last_"></a><h6> |
| <a name="id878315"></a> |
| <a class="link" href="char.html#spirit.qi.reference.char.char.char__first__last_">char_(first, |
| last)</a> |
| </h6> |
| <p> |
| <code class="computeroutput"><span class="identifier">char_</span></code> with two arguments, |
| matches a range of characters. |
| </p> |
| <pre class="programlisting"><span class="identifier">char_</span><span class="special">(</span><span class="char">'a'</span><span class="special">,</span><span class="char">'z'</span><span class="special">)</span> <span class="comment">// alphabetic characters |
| </span><span class="identifier">char_</span><span class="special">(</span><span class="identifier">L</span><span class="char">'0'</span><span class="special">,</span><span class="identifier">L</span><span class="char">'9'</span><span class="special">)</span> <span class="comment">// digits |
| </span></pre> |
| <p> |
| A range of characters is created from a low-high character pair. Such |
| a parser matches a single character that is in the range, including both |
| endpoints. Note, the first character must be <span class="emphasis"><em>before</em></span> |
| the second, according to the underlying <a class="link" href="../basics.html#spirit.qi.reference.basics.character_encoding_namespace">Character |
| Encoding Namespace</a>. |
| </p> |
| <p> |
| Character mapping is inherently platform dependent. It is not guaranteed |
| in the standard for example that <code class="computeroutput"><span class="char">'A'</span> |
| <span class="special"><</span> <span class="char">'Z'</span></code>, |
| that is why in Spirit2, we purposely attach a specific <a class="link" href="../basics.html#spirit.qi.reference.basics.character_encoding_namespace">Character |
| Encoding Namespace</a> (such as ASCII, ISO-8859-1) to the <code class="computeroutput"><span class="identifier">char_</span></code> parser to eliminate such ambiguities. |
| </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> |
| <span class="bold"><strong>Sparse bit vectors</strong></span> |
| </p> |
| <p> |
| To accommodate 16/32 and 64 bit characters, the char-set statically |
| switches from a <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">bitset</span></code> |
| implementation when the character type is not greater than 8 bits, |
| to a sparse bit/boolean set which uses a sorted vector of disjoint |
| ranges (<code class="computeroutput"><span class="identifier">range_run</span></code>). |
| The set is constructed from ranges such that adjacent or overlapping |
| ranges are coalesced. |
| </p> |
| <p> |
| <code class="computeroutput"><span class="identifier">range_runs</span></code> are very |
| space-economical in situations where there are lots of ranges and a |
| few individual disjoint values. Searching is O(log n) where n is the |
| number of ranges. |
| </p> |
| </td></tr> |
| </table></div> |
| <a name="spirit.qi.reference.char.char.char__def_"></a><h6> |
| <a name="id878496"></a> |
| <a class="link" href="char.html#spirit.qi.reference.char.char.char__def_">char_(def)</a> |
| </h6> |
| <p> |
| Lastly, when given a string (a plain C string, a <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">basic_string</span></code>, |
| etc.), the string is regarded as a char-set definition string following |
| a syntax that resembles posix style regular expression character sets |
| (except that double quotes delimit the set elements instead of square |
| brackets and there is no special negation ^ character). Examples: |
| </p> |
| <pre class="programlisting"><span class="identifier">char_</span><span class="special">(</span><span class="string">"a-zA-Z"</span><span class="special">)</span> <span class="comment">// alphabetic characters |
| </span><span class="identifier">char_</span><span class="special">(</span><span class="string">"0-9a-fA-F"</span><span class="special">)</span> <span class="comment">// hexadecimal characters |
| </span><span class="identifier">char_</span><span class="special">(</span><span class="string">"actgACTG"</span><span class="special">)</span> <span class="comment">// DNA identifiers |
| </span><span class="identifier">char_</span><span class="special">(</span><span class="string">"\x7f\x7e"</span><span class="special">)</span> <span class="comment">// Hexadecimal 0x7F and 0x7E |
| </span></pre> |
| <a name="spirit.qi.reference.char.char.lit_ch_"></a><h6> |
| <a name="id878608"></a> |
| <a class="link" href="char.html#spirit.qi.reference.char.char.lit_ch_">lit(ch)</a> |
| </h6> |
| <p> |
| <code class="computeroutput"><span class="identifier">lit</span></code>, when passed a single |
| character, behaves like the single argument <code class="computeroutput"><span class="identifier">char_</span></code> |
| except that <code class="computeroutput"><span class="identifier">lit</span></code> does |
| not synthesize an attribute. A plain <code class="computeroutput"><span class="keyword">char</span></code> |
| or <code class="computeroutput"><span class="keyword">wchar_t</span></code> is equivalent |
| to a <code class="computeroutput"><span class="identifier">lit</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> |
| <code class="computeroutput"><span class="identifier">lit</span></code> is reused by both |
| the <a class="link" href="../string/string.html" title="String (string, lit)">string parsers</a> |
| and the char parsers. In general, a char parser is created when you |
| pass in a character and a string parser is created when you pass in |
| a string. The exception is when you pass a single element literal string, |
| e.g. <code class="computeroutput"><span class="identifier">lit</span><span class="special">(</span><span class="string">"x"</span><span class="special">)</span></code>. |
| In this case, we optimize this to create a char parser instead of a |
| string parser. |
| </p></td></tr> |
| </table></div> |
| <p> |
| Examples: |
| </p> |
| <pre class="programlisting"><span class="char">'x'</span> |
| <span class="identifier">lit</span><span class="special">(</span><span class="char">'x'</span><span class="special">)</span> |
| <span class="identifier">lit</span><span class="special">(</span><span class="identifier">L</span><span class="char">'x'</span><span class="special">)</span> |
| <span class="identifier">lit</span><span class="special">(</span><span class="identifier">c</span><span class="special">)</span> <span class="comment">// c is a char |
| </span></pre> |
| <a name="spirit.qi.reference.char.char.header"></a><h6> |
| <a name="id878772"></a> |
| <a class="link" href="char.html#spirit.qi.reference.char.char.header">Header</a> |
| </h6> |
| <pre class="programlisting"><span class="comment">// forwards to <boost/spirit/home/qi/char/char.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_char_</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.char.char.namespace"></a><h6> |
| <a name="id878846"></a> |
| <a class="link" href="char.html#spirit.qi.reference.char.char.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">lit</span> <span class="comment">// alias: |
| boost::spirit::qi::lit</span></code> |
| </p> |
| </td></tr> |
| <tr><td> |
| <p> |
| <code class="computeroutput"><span class="identifier">ns</span><span class="special">::</span><span class="identifier">char_</span></code> |
| </p> |
| </td></tr> |
| </tbody> |
| </table></div> |
| <p> |
| In the table above, <code class="computeroutput"><span class="identifier">ns</span></code> |
| represents a <a class="link" href="../basics.html#spirit.qi.reference.basics.character_encoding_namespace">Character |
| Encoding Namespace</a>. |
| </p> |
| <a name="spirit.qi.reference.char.char.model_of"></a><h6> |
| <a name="id878965"></a> |
| <a class="link" href="char.html#spirit.qi.reference.char.char.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">c</span></code>, <code class="computeroutput"><span class="identifier">f</span></code>, <code class="computeroutput"><span class="identifier">l</span></code></span></dt> |
| <dd><p> |
| A literal char, e.g. <code class="computeroutput"><span class="char">'x'</span></code>, |
| <code class="computeroutput"><span class="identifier">L</span><span class="char">'x'</span></code> |
| or anything that can be converted to a <code class="computeroutput"><span class="keyword">char</span></code> |
| or <code class="computeroutput"><span class="keyword">wchar_t</span></code>, or a |
| <a class="link" href="../basics.html#spirit.qi.reference.basics.lazy_argument">Lazy Argument</a> |
| that evaluates to anything that can be converted to a <code class="computeroutput"><span class="keyword">char</span></code> or <code class="computeroutput"><span class="keyword">wchar_t</span></code>. |
| </p></dd> |
| <dt><span class="term"><code class="computeroutput"><span class="identifier">ns</span></code></span></dt> |
| <dd><p> |
| A <a class="link" href="../basics.html#spirit.qi.reference.basics.character_encoding_namespace">Character |
| Encoding Namespace</a>. |
| </p></dd> |
| <dt><span class="term"><code class="computeroutput"><span class="identifier">cs</span></code></span></dt> |
| <dd><p> |
| A <a class="link" href="../basics.html#spirit.qi.reference.basics.string">String</a> |
| or a <a class="link" href="../basics.html#spirit.qi.reference.basics.lazy_argument">Lazy |
| Argument</a> that evaluates to a <a class="link" href="../basics.html#spirit.qi.reference.basics.string">String</a> |
| that specifies a char-set definition string following a syntax |
| that resembles posix style regular expression character sets (except |
| the square brackets and the negation <code class="computeroutput"><span class="special">^</span></code> |
| character). |
| </p></dd> |
| <dt><span class="term"><code class="computeroutput"><span class="identifier">cp</span></code></span></dt> |
| <dd><p> |
| A char parser, a char range parser or a char set parser. |
| </p></dd> |
| </dl> |
| </div> |
| <a name="spirit.qi.reference.char.char.expression_semantics"></a><h6> |
| <a name="id879172"></a> |
| <a class="link" href="char.html#spirit.qi.reference.char.char.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> |
| Semantics |
| </p> |
| </th> |
| </tr></thead> |
| <tbody> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="identifier">c</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| Create char parser from a char, <code class="computeroutput"><span class="identifier">c</span></code>. |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="identifier">lit</span><span class="special">(</span><span class="identifier">c</span><span class="special">)</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| Create a char parser from a char, <code class="computeroutput"><span class="identifier">c</span></code>. |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="identifier">ns</span><span class="special">::</span><span class="identifier">char_</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| Create a char parser that matches any character in the <code class="computeroutput"><span class="identifier">ns</span></code> encoding. |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="identifier">ns</span><span class="special">::</span><span class="identifier">char_</span><span class="special">(</span><span class="identifier">c</span><span class="special">)</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| Create a char parser with <code class="computeroutput"><span class="identifier">ns</span></code> |
| encoding from a char, <code class="computeroutput"><span class="identifier">c</span></code>. |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="identifier">ns</span><span class="special">::</span><span class="identifier">char_</span><span class="special">(</span><span class="identifier">f</span><span class="special">,</span> |
| <span class="identifier">l</span><span class="special">)</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| Create a char-range parser that matches characters from range |
| (<code class="computeroutput"><span class="identifier">f</span></code> to <code class="computeroutput"><span class="identifier">l</span></code>, inclusive) with <code class="computeroutput"><span class="identifier">ns</span></code> encoding. |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="identifier">ns</span><span class="special">::</span><span class="identifier">char_</span><span class="special">(</span><span class="identifier">cs</span><span class="special">)</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| Create a char-set parser with <code class="computeroutput"><span class="identifier">ns</span></code> |
| encoding from a char-set definition string, <code class="computeroutput"><span class="identifier">cs</span></code>. |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="special">~</span><span class="identifier">cp</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| Negate <code class="computeroutput"><span class="identifier">cp</span></code>. |
| The result is a negated char parser that matches any character |
| in the <code class="computeroutput"><span class="identifier">ns</span></code> encoding |
| except the characters matched by <code class="computeroutput"><span class="identifier">cp</span></code>. |
| </p> |
| </td> |
| </tr> |
| </tbody> |
| </table></div> |
| <a name="spirit.qi.reference.char.char.attributes"></a><h6> |
| <a name="id879589"></a> |
| <a class="link" href="char.html#spirit.qi.reference.char.char.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">c</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="identifier">unused</span></code> or if |
| <code class="computeroutput"><span class="identifier">c</span></code> is a <a class="link" href="../basics.html#spirit.qi.reference.basics.lazy_argument">Lazy Argument</a>, |
| the character type returned by invoking it. |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="identifier">lit</span><span class="special">(</span><span class="identifier">c</span><span class="special">)</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="identifier">unused</span></code> or if |
| <code class="computeroutput"><span class="identifier">c</span></code> is a <a class="link" href="../basics.html#spirit.qi.reference.basics.lazy_argument">Lazy Argument</a>, |
| the character type returned by invoking it. |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="identifier">ns</span><span class="special">::</span><span class="identifier">char_</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| The character type of the <a class="link" href="../basics.html#spirit.qi.reference.basics.character_encoding_namespace">Character |
| Encoding Namespace</a>, <code class="computeroutput"><span class="identifier">ns</span></code>. |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="identifier">ns</span><span class="special">::</span><span class="identifier">char_</span><span class="special">(</span><span class="identifier">c</span><span class="special">)</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| The character type of the <a class="link" href="../basics.html#spirit.qi.reference.basics.character_encoding_namespace">Character |
| Encoding Namespace</a>, <code class="computeroutput"><span class="identifier">ns</span></code>. |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="identifier">ns</span><span class="special">::</span><span class="identifier">char_</span><span class="special">(</span><span class="identifier">f</span><span class="special">,</span> |
| <span class="identifier">l</span><span class="special">)</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| The character type of the <a class="link" href="../basics.html#spirit.qi.reference.basics.character_encoding_namespace">Character |
| Encoding Namespace</a>, <code class="computeroutput"><span class="identifier">ns</span></code>. |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="identifier">ns</span><span class="special">::</span><span class="identifier">char_</span><span class="special">(</span><span class="identifier">cs</span><span class="special">)</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| The character type of the <a class="link" href="../basics.html#spirit.qi.reference.basics.character_encoding_namespace">Character |
| Encoding Namespace</a>, <code class="computeroutput"><span class="identifier">ns</span></code>. |
| </p> |
| </td> |
| </tr> |
| <tr> |
| <td> |
| <p> |
| <code class="computeroutput"><span class="special">~</span><span class="identifier">cp</span></code> |
| </p> |
| </td> |
| <td> |
| <p> |
| The attribute of <code class="computeroutput"><span class="identifier">cp</span></code>. |
| </p> |
| </td> |
| </tr> |
| </tbody> |
| </table></div> |
| <a name="spirit.qi.reference.char.char.complexity"></a><h6> |
| <a name="id879991"></a> |
| <a class="link" href="char.html#spirit.qi.reference.char.char.complexity">Complexity</a> |
| </h6> |
| <div class="blockquote"><blockquote class="blockquote"><p> |
| <span class="bold"><strong>O(N)</strong></span>, except for char-sets with 16-bit |
| (or more) characters (e.g. <code class="computeroutput"><span class="keyword">wchar_t</span></code>). |
| These have <span class="bold"><strong>O(log N)</strong></span> complexity, where |
| N is the number of distinct character ranges in the set. |
| </p></blockquote></div> |
| <a name="spirit.qi.reference.char.char.example"></a><h6> |
| <a name="id880028"></a> |
| <a class="link" href="char.html#spirit.qi.reference.char.char.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> |
| Some using declarations: |
| </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">lit</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">ascii</span><span class="special">::</span><span class="identifier">char_</span><span class="special">;</span> |
| </pre> |
| <p> |
| </p> |
| <p> |
| Basic literals: |
| </p> |
| <p> |
| |
| </p> |
| <pre class="programlisting"><span class="identifier">test_parser</span><span class="special">(</span><span class="string">"x"</span><span class="special">,</span> <span class="char">'x'</span><span class="special">);</span> <span class="comment">// plain literal |
| </span><span class="identifier">test_parser</span><span class="special">(</span><span class="string">"x"</span><span class="special">,</span> <span class="identifier">lit</span><span class="special">(</span><span class="char">'x'</span><span class="special">));</span> <span class="comment">// explicit literal |
| </span><span class="identifier">test_parser</span><span class="special">(</span><span class="string">"x"</span><span class="special">,</span> <span class="identifier">char_</span><span class="special">(</span><span class="char">'x'</span><span class="special">));</span> <span class="comment">// ascii::char_ |
| </span></pre> |
| <p> |
| </p> |
| <p> |
| Range: |
| </p> |
| <p> |
| |
| </p> |
| <pre class="programlisting"><span class="keyword">char</span> <span class="identifier">ch</span><span class="special">;</span> |
| <span class="identifier">test_parser_attr</span><span class="special">(</span><span class="string">"5"</span><span class="special">,</span> <span class="identifier">char_</span><span class="special">(</span><span class="char">'0'</span><span class="special">,</span><span class="char">'9'</span><span class="special">),</span> <span class="identifier">ch</span><span class="special">);</span> <span class="comment">// ascii::char_ range |
| </span><span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special"><<</span> <span class="identifier">ch</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 '5' |
| </span></pre> |
| <p> |
| </p> |
| <p> |
| Character set: |
| </p> |
| <p> |
| |
| </p> |
| <pre class="programlisting"><span class="identifier">test_parser_attr</span><span class="special">(</span><span class="string">"5"</span><span class="special">,</span> <span class="identifier">char_</span><span class="special">(</span><span class="string">"0-9"</span><span class="special">),</span> <span class="identifier">ch</span><span class="special">);</span> <span class="comment">// ascii::char_ set |
| </span><span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special"><<</span> <span class="identifier">ch</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 '5' |
| </span></pre> |
| <p> |
| </p> |
| <p> |
| Lazy char_ using <a href="../../../../../../phoenix/doc/html/index.html" target="_top">Phoenix</a> |
| </p> |
| <p> |
| |
| </p> |
| <pre class="programlisting"><span class="keyword">namespace</span> <span class="identifier">phx</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">phoenix</span><span class="special">;</span> |
| <span class="identifier">test_parser</span><span class="special">(</span><span class="string">"x"</span><span class="special">,</span> <span class="identifier">phx</span><span class="special">::</span><span class="identifier">val</span><span class="special">(</span><span class="char">'x'</span><span class="special">));</span> <span class="comment">// direct |
| </span><span class="identifier">test_parser</span><span class="special">(</span><span class="string">"5"</span><span class="special">,</span> |
| <span class="identifier">char_</span><span class="special">(</span><span class="identifier">phx</span><span class="special">::</span><span class="identifier">val</span><span class="special">(</span><span class="char">'0'</span><span class="special">),</span><span class="identifier">phx</span><span class="special">::</span><span class="identifier">val</span><span class="special">(</span><span class="char">'9'</span><span class="special">)));</span> <span class="comment">// ascii::char_ range |
| </span></pre> |
| <p> |
| </p> |
| </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 © 2001-2010 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> |
| </div></td> |
| </tr></table> |
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