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setf [C++ Reference]
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<h2><a name="setf" id="setf">setf</a></h2>
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<p>
Syntax:
</p>
<pre class="c code c++" style="font-family:monospace;"> fmtflags stream<span class="sy0">::</span><span class="me2">setf</span><span class="br0">(</span> fmtflags flags <span class="br0">)</span><span class="sy0">;</span>
fmtflags stream<span class="sy0">::</span><span class="me2">setf</span><span class="br0">(</span> fmtflags flags<span class="sy0">,</span> fmtflags needed <span class="br0">)</span><span class="sy0">;</span></pre>
<p>
The function setf() sets the io_stream_format_flags of the current stream to
flags. The optional needed argument specifies that only the flags that are in
both flags and needed should be set. The return value is the previous
configuration of io_stream_format_flags.
For example:
</p>
<pre class="c code c++" style="font-family:monospace;"> <span class="kw4">int</span> number <span class="sy0">=</span> <span class="nu12">0x3FF</span><span class="sy0">;</span>
<a href="http://www.opengroup.org/onlinepubs/009695399/functions/cout.html"><span class="kw3">cout</span></a>.<span class="me1">setf</span><span class="br0">(</span> ios<span class="sy0">::</span><span class="me2">dec</span> <span class="br0">)</span><span class="sy0">;</span>
<a href="http://www.opengroup.org/onlinepubs/009695399/functions/cout.html"><span class="kw3">cout</span></a> <span class="sy0"><<</span> <span class="st0">"Decimal: "</span> <span class="sy0"><<</span> number <span class="sy0"><<</span> endl<span class="sy0">;</span>
<a href="http://www.opengroup.org/onlinepubs/009695399/functions/cout.html"><span class="kw3">cout</span></a>.<span class="me1">unsetf</span><span class="br0">(</span> ios<span class="sy0">::</span><span class="me2">dec</span> <span class="br0">)</span><span class="sy0">;</span>
<a href="http://www.opengroup.org/onlinepubs/009695399/functions/cout.html"><span class="kw3">cout</span></a>.<span class="me1">setf</span><span class="br0">(</span> ios<span class="sy0">::</span><span class="me2">hex</span> <span class="br0">)</span><span class="sy0">;</span>
<a href="http://www.opengroup.org/onlinepubs/009695399/functions/cout.html"><span class="kw3">cout</span></a> <span class="sy0"><<</span> <span class="st0">"Hexadecimal: "</span> <span class="sy0"><<</span> number <span class="sy0"><<</span> endl<span class="sy0">;</span></pre>
<p>
Note that the preceding code is functionally identical to:
</p>
<pre class="c code c++" style="font-family:monospace;"> <span class="kw4">int</span> number <span class="sy0">=</span> <span class="nu12">0x3FF</span><span class="sy0">;</span>
<a href="http://www.opengroup.org/onlinepubs/009695399/functions/cout.html"><span class="kw3">cout</span></a> <span class="sy0"><<</span> <span class="st0">"Decimal: "</span> <span class="sy0"><<</span> number <span class="sy0"><<</span> endl <span class="sy0"><<</span> hex <span class="sy0"><<</span> <span class="st0">"Hexadecimal: "</span> <span class="sy0"><<</span> number
<span class="sy0"><<</span> dec <span class="sy0"><<</span> endl<span class="sy0">;</span></pre>
<p>
thanks to io_stream_manipulators.
</p>
<p>
Related Topics: <a href="../io/flags.html" class="wikilink1" title="io:flags">flags</a>, <a href="../io/unsetf.html" class="wikilink1" title="io:unsetf">unsetf</a>
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