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<h1 class="topictitle1">Body Objects</h1>
<div>
<p>Some nodes execute user-provided body objects. These objects can be
created by instantiating function objects or lambda expressions. The nodes that
use body objects include
<span class="keyword">continue_node</span>,
<span class="keyword">function_node</span>,
<span class="keyword">source_node</span> and
<span class="keyword">multifunction_node</span>.
</p>
<div class="Note"><h3 class="NoteTipHead">
Caution</h3>
<p> The body objects passed to the flow graph nodes are copied. Therefore
updates to member variables will not affect the original object used to
construct the node. If the state held within a body object must be inspected
from outside of the node, the
<span class="option">copy_body</span> function can be used to obtain an updated
copy.
</p>
</div>
<div class="Note"><h3 class="NoteTipHead">
Caution</h3>
<p> The source_node has a one-item buffer which may contain a value
obtained from executing the node's body. If the source_node has
emitted <samp class="codeph">N</samp> items, the state of the body returned by
<span class="option">copy_body</span> may indicate it has been called <samp class="codeph">N + 1</samp> times.
</p>
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<div class="familylinks">
<div class="parentlink"><strong>Parent topic:</strong> <a href="../../reference/flow_graph.htm">Flow Graph</a></div>
</div>
<div class="See Also">
<h2>See Also</h2>
<div class="linklist">
<div><a href="copy_body_func.htm">copy_body Template Function
</a></div></div>
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