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DOCS: Document the syntax for casting.

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Jeremy Wall 2019-12-09 18:41:01 -06:00
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commit 9a3bfbad02
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docsite/site/content/reference/expressions.md
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@ -213,6 +213,16 @@ The type must be a string literal matching one of:
("foo" is "str") == true;
```
Casting
-------
UCG can cast primitive types to other primitive types. UCG is very conservative in
the casts it allows however and a failed cast is a compile error. The allowed casts
are `int(expr)`, `float(expr)`, `str(expr)`, and `bool(expr)`. Casts are not function
calls even though they look like them and as a result you can not define your own
functions with the same name as a cast. If the expressions do not resolve to a primitive
type that is castable to the desired type then a compile error will occur.
Copy Expressions
----------------