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45 lines
1.2 KiB
Markdown
45 lines
1.2 KiB
Markdown
---
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title: Linking Rules
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---
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Linking Rules
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=============
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To make XOD programs behave predictably, there are some rules on how pins can
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be linked.
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Outputs and inputs
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------------------
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You’re are not allowed to link two input pins, nor are you allowed to link
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two output pins. It doesn’t makes much sense.
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A link must always connect an output and an input.
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If you want to mirror values, just create multiple links from an output pin.
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An output can have an arbitrary number of links, but an input can have no more
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than one incoming link.
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Type matching
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-------------
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If an input and an output have the same [data type](../data-types/), they may
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be linked as is.
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However, if they have different types, they can only be linked if the output
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type can be [cast](../data-types/#casting-rules) into the input type.
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Once you start linking, pins that are suitable for the other end of the link
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are highlighted.
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Color code
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----------
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<span class="ui purple circular empty label"></span> Pulse<br/>
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<span class="ui pink circular empty label"></span> Boolean<br/>
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<span class="ui green circular empty label"></span> Number<br/>
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<span class="ui yellow circular empty label"></span> String<br/>
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