Clarify custom operators.
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@ -157,7 +157,7 @@ impl Engine {
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}
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}
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/// Register a custom operator with a precedence into the language.
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/// Register a custom operator with a precedence into the language.
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///
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///
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/// The operator must be a valid identifier (i.e. it cannot be a symbol).
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/// The operator can be a valid identifier, a reserved symbol, a disabled operator or a disabled keyword.
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///
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///
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/// The precedence cannot be zero.
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/// The precedence cannot be zero.
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///
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///
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@ -169,15 +169,15 @@ impl Engine {
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///
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///
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/// let mut engine = Engine::new();
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/// let mut engine = Engine::new();
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///
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///
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/// // Register a custom operator called 'foo' and give it
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/// // Register a custom operator called '#' and give it
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/// // a precedence of 160 (i.e. between +|- and *|/).
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/// // a precedence of 160 (i.e. between +|- and *|/).
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/// engine.register_custom_operator("foo", 160).expect("should succeed");
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/// engine.register_custom_operator("#", 160).expect("should succeed");
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///
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///
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/// // Register a binary function named 'foo'
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/// // Register a binary function named '#'
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/// engine.register_fn("foo", |x: i64, y: i64| (x * y) - (x + y));
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/// engine.register_fn("#", |x: i64, y: i64| (x * y) - (x + y));
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///
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///
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/// assert_eq!(
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/// assert_eq!(
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/// engine.eval_expression::<i64>("1 + 2 * 3 foo 4 - 5 / 6")?,
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/// engine.eval_expression::<i64>("1 + 2 * 3 # 4 - 5 / 6")?,
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/// 15
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/// 15
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/// );
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/// );
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/// # Ok(())
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/// # Ok(())
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