forked from boostorg/fusion
updates functional module: only two unfused variants, now
[SVN r51381]
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Tobias Schwinger committed
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@@ -3,7 +3,7 @@
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<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
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<title>I/O</title>
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<link rel="stylesheet" href="../../../../../../../doc/html/boostbook.css" type="text/css">
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<meta name="generator" content="DocBook XSL Stylesheets V1.66.1">
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<meta name="generator" content="DocBook XSL Stylesheets V1.68.1">
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<link rel="start" href="../../../index.html" title="Chapter 1. Fusion 2.0">
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<link rel="up" href="../operator.html" title="Operator">
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<link rel="prev" href="../operator.html" title="Operator">
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@@ -30,25 +30,24 @@
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<dt><span class="section"><a href="i_o/out.html">out</a></span></dt>
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</dl></div>
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<p>
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The I/O operators: <tt class="computeroutput"><span class="special"><<</span></tt>
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and <tt class="computeroutput"><span class="special">>></span></tt> work generically
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on all Fusion sequences. The global <tt class="computeroutput"><span class="keyword">operator</span><span class="special"><<</span></tt> has been overloaded for generic
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The I/O operators: <code class="computeroutput"><span class="special"><<</span></code>
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and <code class="computeroutput"><span class="special">>></span></code> work generically
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on all Fusion sequences. The global <code class="computeroutput"><span class="keyword">operator</span><span class="special"><<</span></code> has been overloaded for generic
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output streams such that <a href="../../sequence.html" title="Sequence">Sequence</a>(s)
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are output by recursively calling <tt class="computeroutput"><span class="keyword">operator</span><span class="special"><<</span></tt> for each element. Analogously,
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the global <tt class="computeroutput"><span class="keyword">operator</span><span class="special">>></span></tt>
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are output by recursively calling <code class="computeroutput"><span class="keyword">operator</span><span class="special"><<</span></code> for each element. Analogously,
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the global <code class="computeroutput"><span class="keyword">operator</span><span class="special">>></span></code>
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has been overloaded to extract <a href="../../sequence.html" title="Sequence">Sequence</a>(s)
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from generic input streams by recursively calling <tt class="computeroutput"><span class="keyword">operator</span><span class="special">>></span></tt> for each element.
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from generic input streams by recursively calling <code class="computeroutput"><span class="keyword">operator</span><span class="special">>></span></code> for each element.
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</p>
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<p>
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The default delimiter between the elements is space, and the <a href="../../sequence.html" title="Sequence">Sequence</a>
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is enclosed in parenthesis. For Example:
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</p>
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<pre class="programlisting">
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<a href="../../container/vector.html" title="vector"><tt class="computeroutput"><span class="identifier">vector</span></tt></a><span class="special"><</span><span class="keyword">float</span><span class="special">,</span> <span class="keyword">int</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">></span> <span class="identifier">a</span><span class="special">(</span><span class="number">1.0f</span><span class="special">,</span> <span class="number">2</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">(</span><span class="string">"Howdy folks!"</span><span class="special">);</span>
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<pre class="programlisting"><a href="../../container/vector.html" title="vector"><code class="computeroutput"><span class="identifier">vector</span></code></a><span class="special"><</span><span class="keyword">float</span><span class="special">,</span> <span class="keyword">int</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">></span> <span class="identifier">a</span><span class="special">(</span><span class="number">1.0f</span><span class="special">,</span> <span class="number">2</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span><span class="special">(</span><span class="string">"Howdy folks!"</span><span class="special">);</span>
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<span class="identifier">cout</span> <span class="special"><<</span> <span class="identifier">a</span><span class="special">;</span>
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</pre>
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<p>
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outputs the <a href="../../container/vector.html" title="vector"><tt class="computeroutput"><span class="identifier">vector</span></tt></a>
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outputs the <a href="../../container/vector.html" title="vector"><code class="computeroutput"><span class="identifier">vector</span></code></a>
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as: (1.0 2 Howdy folks!)
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</p>
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<p>
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@@ -57,70 +56,66 @@
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<div class="variablelist">
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<p class="title"><b>Manipulators</b></p>
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<dl>
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<dt><span class="term"><tt class="computeroutput"><span class="identifier">tuple_open</span><span class="special">(</span><span class="identifier">arg</span><span class="special">)</span></tt></span></dt>
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<dt><span class="term"><code class="computeroutput"><span class="identifier">tuple_open</span><span class="special">(</span><span class="identifier">arg</span><span class="special">)</span></code></span></dt>
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<dd><p>
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Defines the character that is output before the first element.
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</p></dd>
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<dt><span class="term"><tt class="computeroutput"><span class="identifier">tuple_close</span><span class="special">(</span><span class="identifier">arg</span><span class="special">)</span></tt></span></dt>
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<dt><span class="term"><code class="computeroutput"><span class="identifier">tuple_close</span><span class="special">(</span><span class="identifier">arg</span><span class="special">)</span></code></span></dt>
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<dd><p>
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Defines the character that is output after the last element.
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</p></dd>
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<dt><span class="term"><tt class="computeroutput"><span class="identifier">tuple_delimiter</span><span class="special">(</span><span class="identifier">arg</span><span class="special">)</span></tt></span></dt>
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<dt><span class="term"><code class="computeroutput"><span class="identifier">tuple_delimiter</span><span class="special">(</span><span class="identifier">arg</span><span class="special">)</span></code></span></dt>
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<dd><p>
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Defines the delimiter character between elements.
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</p></dd>
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</dl>
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</div>
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<p>
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The argument to <tt class="computeroutput"><span class="identifier">tuple_open</span></tt>,
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<tt class="computeroutput"><span class="identifier">tuple_close</span></tt> and <tt class="computeroutput"><span class="identifier">tuple_delimiter</span></tt> may be a <tt class="computeroutput"><span class="keyword">char</span></tt>, <tt class="computeroutput"><span class="keyword">wchar_t</span></tt>,
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The argument to <code class="computeroutput"><span class="identifier">tuple_open</span></code>,
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<code class="computeroutput"><span class="identifier">tuple_close</span></code> and <code class="computeroutput"><span class="identifier">tuple_delimiter</span></code> may be a <code class="computeroutput"><span class="keyword">char</span></code>, <code class="computeroutput"><span class="keyword">wchar_t</span></code>,
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a C-string, or a wide C-string.
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</p>
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<p>
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Example:
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</p>
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<pre class="programlisting">
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<span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special"><<</span> <span class="identifier">tuple_open</span><span class="special">(</span><span class="char">'['</span><span class="special">)</span> <span class="special"><<</span> <span class="identifier">tuple_close</span><span class="special">(</span><span class="char">']'</span><span class="special">)</span> <span class="special"><<</span> <span class="identifier">tuple_delimiter</span><span class="special">(</span><span class="string">", "</span><span class="special">)</span> <span class="special"><<</span> <span class="identifier">a</span><span class="special">;</span>
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<pre class="programlisting"><span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special"><<</span> <span class="identifier">tuple_open</span><span class="special">(</span><span class="char">'['</span><span class="special">)</span> <span class="special"><<</span> <span class="identifier">tuple_close</span><span class="special">(</span><span class="char">']'</span><span class="special">)</span> <span class="special"><<</span> <span class="identifier">tuple_delimiter</span><span class="special">(</span><span class="string">", "</span><span class="special">)</span> <span class="special"><<</span> <span class="identifier">a</span><span class="special">;</span>
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</pre>
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<p>
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outputs the same <a href="../../container/vector.html" title="vector"><tt class="computeroutput"><span class="identifier">vector</span></tt></a>, <tt class="computeroutput"><span class="identifier">a</span></tt>
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outputs the same <a href="../../container/vector.html" title="vector"><code class="computeroutput"><span class="identifier">vector</span></code></a>, <code class="computeroutput"><span class="identifier">a</span></code>
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as: [1.0, 2, Howdy folks!]
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</p>
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<p>
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The same manipulators work with <tt class="computeroutput"><span class="keyword">operator</span><span class="special">>></span></tt> and <tt class="computeroutput"><span class="identifier">istream</span></tt>
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as well. Suppose the <tt class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">cin</span></tt>
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The same manipulators work with <code class="computeroutput"><span class="keyword">operator</span><span class="special">>></span></code> and <code class="computeroutput"><span class="identifier">istream</span></code>
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as well. Suppose the <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">cin</span></code>
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stream contains the following data:
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</p>
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<pre class="programlisting">
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<span class="special">(</span><span class="number">1</span> <span class="number">2</span> <span class="number">3</span><span class="special">)</span> <span class="special">[</span><span class="number">4</span><span class="special">:</span><span class="number">5</span><span class="special">]</span>
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<pre class="programlisting"><span class="special">(</span><span class="number">1</span> <span class="number">2</span> <span class="number">3</span><span class="special">)</span> <span class="special">[</span><span class="number">4</span><span class="special">:</span><span class="number">5</span><span class="special">]</span>
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</pre>
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<p>
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The code:
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</p>
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<pre class="programlisting">
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<a href="../../container/vector.html" title="vector"><tt class="computeroutput"><span class="identifier">vector</span></tt></a><span class="special"><</span><span class="keyword">int</span><span class="special">,</span> <span class="keyword">int</span><span class="special">,</span> <span class="keyword">int</span><span class="special">></span> <span class="identifier">i</span><span class="special">;</span>
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<a href="../../container/vector.html" title="vector"><tt class="computeroutput"><span class="identifier">vector</span></tt></a><span class="special"><</span><span class="keyword">int</span><span class="special">,</span> <span class="keyword">int</span><span class="special">></span> <span class="identifier">j</span><span class="special">;</span>
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<pre class="programlisting"><a href="../../container/vector.html" title="vector"><code class="computeroutput"><span class="identifier">vector</span></code></a><span class="special"><</span><span class="keyword">int</span><span class="special">,</span> <span class="keyword">int</span><span class="special">,</span> <span class="keyword">int</span><span class="special">></span> <span class="identifier">i</span><span class="special">;</span>
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<a href="../../container/vector.html" title="vector"><code class="computeroutput"><span class="identifier">vector</span></code></a><span class="special"><</span><span class="keyword">int</span><span class="special">,</span> <span class="keyword">int</span><span class="special">></span> <span class="identifier">j</span><span class="special">;</span>
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<span class="identifier">std</span><span class="special">::</span><span class="identifier">cin</span> <span class="special">>></span> <span class="identifier">i</span><span class="special">;</span>
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<span class="identifier">std</span><span class="special">::</span><span class="identifier">cin</span> <span class="special">>></span> <span class="identifier">set_open</span><span class="special">(</span><span class="char">'['</span><span class="special">)</span> <span class="special">>></span> <span class="identifier">set_close</span><span class="special">(</span><span class="char">']'</span><span class="special">)</span> <span class="special">>></span> <span class="identifier">set_delimiter</span><span class="special">(</span><span class="char">':'</span><span class="special">);</span>
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<span class="identifier">std</span><span class="special">::</span><span class="identifier">cin</span> <span class="special">>></span> <span class="identifier">j</span><span class="special">;</span>
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</pre>
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<p>
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reads the data into the <a href="../../container/vector.html" title="vector"><tt class="computeroutput"><span class="identifier">vector</span></tt></a>(s) <tt class="computeroutput"><span class="identifier">i</span></tt>
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and <tt class="computeroutput"><span class="identifier">j</span></tt>.
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reads the data into the <a href="../../container/vector.html" title="vector"><code class="computeroutput"><span class="identifier">vector</span></code></a>(s) <code class="computeroutput"><span class="identifier">i</span></code>
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and <code class="computeroutput"><span class="identifier">j</span></code>.
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</p>
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<p>
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Note that extracting <a href="../../sequence.html" title="Sequence">Sequence</a>(s)
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with <tt class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span></tt> or C-style string elements does
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with <code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">string</span></code> or C-style string elements does
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not generally work, since the streamed <a href="../../sequence.html" title="Sequence">Sequence</a>
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representation may not be unambiguously parseable.
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</p>
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<a name="fusion.sequence.operator.i_o.header"></a><h5>
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<a name="id519616"></a>
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<a name="id1043601"></a>
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<a href="i_o.html#fusion.sequence.operator.i_o.header">Header</a>
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</h5>
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<pre class="programlisting">
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<span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">fusion</span><span class="special">/</span><span class="identifier">sequence</span><span class="special">/</span><span class="identifier">io</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span>
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<pre class="programlisting"><span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">fusion</span><span class="special">/</span><span class="identifier">sequence</span><span class="special">/</span><span class="identifier">io</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span>
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<span class="preprocessor">#include</span> <span class="special"><</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">fusion</span><span class="special">/</span><span class="identifier">include</span><span class="special">/</span><span class="identifier">io</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">></span>
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</pre>
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</div>
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