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<div class="section">
<div class="titlepage"><div><div><h5 class="title">
<a name="spirit.karma.reference.generate_api.stream_api"></a><a class="link" href="stream_api.html" title="Stream Based Generator API">Stream
Based Generator API</a>
</h5></div></div></div>
<a name="spirit.karma.reference.generate_api.stream_api.description"></a><h6>
<a name="id998794"></a>
<a class="link" href="stream_api.html#spirit.karma.reference.generate_api.stream_api.description">Description</a>
</h6>
<p>
The library provides a couple of Standard IO <a href="http://www.cppreference.com/wiki/io/io_flags#manipulators" target="_top">Manipulators</a>
allowing to integrate <span class="emphasis"><em>Spirit.Karma</em></span> output generation
facilities with Standard output streams. These generator manipulators
have two forms. The first form, <code class="computeroutput"><span class="identifier">format</span></code>,
concatenates the output generated by the involved components without
inserting any output in between. The second, <code class="computeroutput"><span class="identifier">format_delimited</span></code>,
intersperses the output generated by the involved components using the
given delimiter generator. Both versions can take in attributes by (constant)
reference that hold the attribute values to output.
</p>
<a name="spirit.karma.reference.generate_api.stream_api.header"></a><h6>
<a name="id998838"></a>
<a class="link" href="stream_api.html#spirit.karma.reference.generate_api.stream_api.header">Header</a>
</h6>
<pre class="programlisting"><span class="comment">// forwards to &lt;boost/spirit/home/karma/stream/format_manip.hpp&gt;
</span><span class="preprocessor">#include</span> <span class="special">&lt;</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">karma_format</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
<p>
For variadic attributes:
</p>
<pre class="programlisting"><span class="comment">// forwards to &lt;boost/spirit/home/karma/stream/format_manip_attr.hpp&gt;
</span><span class="preprocessor">#include</span> <span class="special">&lt;</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">karma_format_attr</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
<p>
The variadic attributes version of the API allows one or more attributes
to be passed into the <code class="computeroutput"><span class="identifier">format</span></code>
manipulators. The manipulators taking two or more attributes are usable
when the generator expression is a <a class="link" href="../operator/sequence.html" title="Sequences (a &lt;&lt; b)">Sequence
(<code class="computeroutput"><span class="special">&lt;&lt;</span></code>)</a> only.
In this case each of the attributes passed have to match the corresponding
part of the sequence.
</p>
<p>
For the API functions deducing the correct (matching) generator type
from the supplied attribute type:
</p>
<pre class="programlisting"><span class="comment">// forwards to &lt;boost/spirit/home/karma/format_auto.hpp&gt;
</span><span class="preprocessor">#include</span> <span class="special">&lt;</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">karma_format_auto</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
<p>
Also, see <a class="link" href="../../../structure/include.html" title="Include">Include Structure</a>.
</p>
<a name="spirit.karma.reference.generate_api.stream_api.namespace"></a><h6>
<a name="id999051"></a>
<a class="link" href="stream_api.html#spirit.karma.reference.generate_api.stream_api.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">karma</span><span class="special">::</span><span class="identifier">format</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">karma</span><span class="special">::</span><span class="identifier">format_delimited</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">karma</span><span class="special">::</span><span class="identifier">delimit_flag</span><span class="special">::</span><span class="identifier">predelimit</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">karma</span><span class="special">::</span><span class="identifier">delimit_flag</span><span class="special">::</span><span class="identifier">dont_predelimit</span></code>
</p>
</td></tr>
</tbody>
</table></div>
<a name="spirit.karma.reference.generate_api.stream_api.synopsis"></a><h6>
<a name="id999267"></a>
<a class="link" href="stream_api.html#spirit.karma.reference.generate_api.stream_api.synopsis">Synopsis</a>
</h6>
<pre class="programlisting"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span> <span class="keyword">namespace</span> <span class="identifier">spirit</span> <span class="special">{</span> <span class="keyword">namespace</span> <span class="identifier">karma</span>
<span class="special">{</span>
<span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">Expr</span><span class="special">&gt;</span>
<span class="keyword">inline</span> <span class="special">&lt;</span><span class="identifier">unspecified</span><span class="special">&gt;</span>
<span class="identifier">format</span><span class="special">(</span>
<span class="identifier">Expr</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">xpr</span><span class="special">);</span>
<span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">Expr</span>
<span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">Attr1</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">Attr2</span><span class="special">,</span> <span class="special">...,</span> <span class="keyword">typename</span> <span class="identifier">AttrN</span><span class="special">&gt;</span>
<span class="keyword">inline</span> <span class="special">&lt;</span><span class="identifier">unspecified</span><span class="special">&gt;</span>
<span class="identifier">format</span><span class="special">(</span>
<span class="identifier">Expr</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">xpr</span>
<span class="special">,</span> <span class="identifier">Attr1</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">attr1</span><span class="special">,</span> <span class="identifier">Attr2</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">attr2</span><span class="special">,</span> <span class="special">...,</span> <span class="identifier">AttrN</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">attrN</span><span class="special">);</span>
<span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">Expr</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">Delimiter</span><span class="special">&gt;</span>
<span class="keyword">inline</span> <span class="special">&lt;</span><span class="identifier">unspecified</span><span class="special">&gt;</span>
<span class="identifier">format_delimited</span><span class="special">(</span>
<span class="identifier">Expr</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">expr</span>
<span class="special">,</span> <span class="identifier">Delimiter</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">d</span>
<span class="special">,</span> <span class="identifier">BOOST_SCOPED_ENUM</span><span class="special">(</span><span class="identifier">delimit_flag</span><span class="special">)</span> <span class="identifier">pre_delimit</span> <span class="special">=</span> <span class="identifier">delimit_flag</span><span class="special">::</span><span class="identifier">dont_predelimit</span><span class="special">);</span>
<span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">Expr</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">Delimiter</span>
<span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">Attr1</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">Attr2</span><span class="special">,</span> <span class="special">...,</span> <span class="keyword">typename</span> <span class="identifier">AttrN</span><span class="special">&gt;</span>
<span class="keyword">inline</span> <span class="special">&lt;</span><span class="identifier">unspecified</span><span class="special">&gt;</span>
<span class="identifier">format_delimited</span><span class="special">(</span>
<span class="identifier">Expr</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">expr</span>
<span class="special">,</span> <span class="identifier">Delimiter</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">d</span>
<span class="special">,</span> <span class="identifier">Attr1</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">attr1</span><span class="special">,</span> <span class="identifier">Attr2</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">attr2</span><span class="special">,</span> <span class="special">...,</span> <span class="identifier">AttrN</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">attrN</span><span class="special">);</span>
<span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">Expr</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">Delimiter</span>
<span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">Attr1</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">Attr2</span><span class="special">,</span> <span class="special">...,</span> <span class="keyword">typename</span> <span class="identifier">AttrN</span><span class="special">&gt;</span>
<span class="keyword">inline</span> <span class="special">&lt;</span><span class="identifier">unspecified</span><span class="special">&gt;</span>
<span class="identifier">format_delimited</span><span class="special">(</span>
<span class="identifier">Expr</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">expr</span>
<span class="special">,</span> <span class="identifier">Delimiter</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">d</span>
<span class="special">,</span> <span class="identifier">BOOST_SCOPED_ENUM</span><span class="special">(</span><span class="identifier">delimit_flag</span><span class="special">)</span> <span class="identifier">pre_delimit</span>
<span class="special">,</span> <span class="identifier">Attr1</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">attr1</span><span class="special">,</span> <span class="identifier">Attr2</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">attr2</span><span class="special">,</span> <span class="special">...,</span> <span class="identifier">AttrN</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">attrN</span><span class="special">);</span>
<span class="special">}}}</span>
</pre>
<p>
<span class="emphasis"><em>Spirit.Karma</em></span> generator API functions based on the
automatic creation of the matching generator type:
</p>
<pre class="programlisting"><span class="keyword">namespace</span> <span class="identifier">boost</span> <span class="special">{</span> <span class="keyword">namespace</span> <span class="identifier">spirit</span> <span class="special">{</span> <span class="keyword">namespace</span> <span class="identifier">karma</span>
<span class="special">{</span>
<span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">Attr</span><span class="special">,</span> <span class="keyword">typename</span> <span class="identifier">Delimiter</span><span class="special">&gt;</span>
<span class="keyword">inline</span> <span class="special">&lt;</span><span class="identifier">unspecified</span><span class="special">&gt;</span>
<span class="identifier">format_delimited</span><span class="special">(</span>
<span class="identifier">Attr</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">attr</span>
<span class="special">,</span> <span class="identifier">Delimiter</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">d</span>
<span class="special">,</span> <span class="identifier">BOOST_SCOPED_ENUM</span><span class="special">(</span><span class="identifier">delimit_flag</span><span class="special">)</span> <span class="identifier">pre_delimit</span> <span class="special">=</span> <span class="identifier">delimit_flag</span><span class="special">::</span><span class="identifier">dont_predelimit</span><span class="special">);</span>
<span class="keyword">template</span> <span class="special">&lt;</span><span class="keyword">typename</span> <span class="identifier">Attr</span><span class="special">&gt;</span>
<span class="keyword">inline</span> <span class="special">&lt;</span><span class="identifier">unspecified</span><span class="special">&gt;</span>
<span class="identifier">format</span><span class="special">(</span>
<span class="identifier">Attr</span> <span class="keyword">const</span><span class="special">&amp;</span> <span class="identifier">xpr</span><span class="special">);</span>
<span class="special">}}}</span>
</pre>
<p>
All functions above return a standard IO stream manipulator instance
(see <a href="http://www.cppreference.com/wiki/io/io_flags#manipulators" target="_top">Manipulators</a>),
which when streamed to an output stream will result in generating the
output as emitted by the embedded <span class="emphasis"><em>Spirit.Karma</em></span> generator
expression. Any error occurring during the invocation of the <span class="emphasis"><em>Spirit.Karma</em></span>
generators will be reflected in the streams status flag (<code class="computeroutput"><span class="identifier">std</span><span class="special">::</span><span class="identifier">ios_base</span><span class="special">::</span><span class="identifier">failbit</span></code> will be set).
</p>
<p>
The maximum number of supported arguments is limited by the preprocessor
constant <code class="computeroutput"><span class="identifier">SPIRIT_ARGUMENTS_LIMIT</span></code>.
This constant defaults to the value defined by the preprocessor constant
<code class="computeroutput"><span class="identifier">PHOENIX_LIMIT</span></code> (which
in turn defaults to <code class="computeroutput"><span class="number">10</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>
The variadic manipulators with two or more attributes internally combine
(constant) references to all passed attributes into a <code class="computeroutput"><span class="identifier">fusion</span><span class="special">::</span><span class="identifier">vector</span></code> and forward this as a combined
attribute to the corresponding manipulator taking one attribute.
</p></td></tr>
</table></div>
<p>
The <code class="computeroutput"><span class="identifier">format_delimited</span></code>
manipulators not taking an explicit <code class="computeroutput"><span class="identifier">delimit_flag</span></code>
as one of their arguments don't invoke the passed delimiter before starting
to generate output from the generator expression. This can be enabled
by using the other version of that manipulator while passing <code class="computeroutput"><span class="identifier">delimit_flag</span><span class="special">::</span><span class="identifier">predelimit</span></code> to the corresponding argument.
</p>
<a name="spirit.karma.reference.generate_api.stream_api.template_parameters"></a><h6>
<a name="id1002228"></a>
<a class="link" href="stream_api.html#spirit.karma.reference.generate_api.stream_api.template_parameters">Template
parameters</a>
</h6>
<div class="informaltable"><table class="table">
<colgroup>
<col>
<col>
</colgroup>
<thead><tr>
<th>
<p>
Parameter
</p>
</th>
<th>
<p>
Description
</p>
</th>
</tr></thead>
<tbody>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">Expr</span></code>
</p>
</td>
<td>
<p>
An expression that can be converted to a Karma generator.
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">Delimiter</span></code>
</p>
</td>
<td>
<p>
Generator used to delimit the output of the expression components.
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">Attr</span></code>
</p>
</td>
<td>
<p>
An attribute type utilized to create the corresponding generator
type from.
</p>
</td>
</tr>
<tr>
<td>
<p>
<code class="computeroutput"><span class="identifier">Attr1</span></code>, <code class="computeroutput"><span class="identifier">Attr2</span></code>, ..., <code class="computeroutput"><span class="identifier">AttrN</span></code>
</p>
</td>
<td>
<p>
One or more attributes.
</p>
</td>
</tr>
</tbody>
</table></div>
</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 &#169; 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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