rhai/doc/src/engine/raw.md

Raw Engine

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Engine::new creates a scripting [Engine] with common functionalities (e.g. printing to the console via print).

In many controlled embedded environments, however, these may not be needed and unnecessarily occupy application code storage space.

Use Engine::new_raw to create a raw Engine, in which only a minimal set of basic arithmetic and logical operators are supported (see below).

To add more functionalities to a raw Engine, load [packages] into it.

Built-in Operators

Operators	Assignment operators	Supported for types (see [standard types])
+,	+=	INT, FLOAT (if not [no_float]), char, ImmutableString
-, *, /, %, ~,	-=, *=, /=, %=, ~=	INT, FLOAT (if not [no_float])
<<, >>	<<=, >>=	INT
&, |, ^	&=, |=, ^=	INT, bool
&&, ||		bool
==, !=		INT, FLOAT (if not [no_float]), bool, char, (), ImmutableString
>, >=, <, <=		INT, FLOAT (if not [no_float]), char, (), ImmutableString