46 lines
1.5 KiB
Rust
46 lines
1.5 KiB
Rust
/* types/value.rs
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* Eryn Wells <eryn@erynwells.me>
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*/
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use std::fmt::Debug;
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use std::any::Any;
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pub trait Value: Debug + IsBool + IsChar + IsNumber + ValueEq {
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fn as_value(&self) -> &Value;
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}
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pub trait IsBool {
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/// Should return `true` if this Value is a Bool.
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fn is_bool(&self) -> bool { false }
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}
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pub trait IsChar {
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/// Should return `true` if this Value is a Char.
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fn is_char(&self) -> bool { false }
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}
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pub trait IsNumber {
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/// Should return `true` if this Value is a number type.
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fn is_number(&self) -> bool { self.is_complex() || self.is_real() || self.is_rational() || self.is_integer() }
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/// Should return `true` if this Value is a complex number type.
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fn is_complex(&self) -> bool { self.is_real() }
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/// Should return `true` if this Value is a real number type.
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fn is_real(&self) -> bool { self.is_rational() }
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/// Should return `true` if this Value is a rational number type.
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fn is_rational(&self) -> bool { self.is_integer() }
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/// Should return `true` if this Value is a integer number type.
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fn is_integer(&self) -> bool { false }
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}
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/// A trait on value types that makes it easier to compare values of disparate types. The methods
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/// provided by this trait are used by the PartialEq implementation on Values.
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pub trait ValueEq {
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fn eq(&self, other: &Value) -> bool;
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fn as_any(&self) -> &Any;
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}
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impl<'lhs,'rhs> PartialEq<Value+'rhs> for Value+'lhs {
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fn eq(&self, other: &(Value+'rhs)) -> bool {
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ValueEq::eq(self, other)
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}
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}
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