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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
//! The `Finite<T>` struct.
use heapsize::HeapSizeOf;
use num_traits::Float;
use std::ops::Deref;
/// Encapsulates the IDL restricted float type.
#[derive(JSTraceable, Clone, Copy, Eq, PartialEq)]
pub struct Finite<T: Float>(T);
impl<T: Float> Finite<T> {
/// Create a new `Finite<T: Float>` safely.
pub fn new(value: T) -> Option<Finite<T>> {
if value.is_finite() {
Some(Finite(value))
} else {
None
}
}
/// Create a new `Finite<T: Float>`.
#[inline]
pub fn wrap(value: T) -> Finite<T> {
assert!(value.is_finite(),
"Finite<T> doesn't encapsulate unrestricted value.");
Finite(value)
}
}
impl<T: Float> Deref for Finite<T> {
type Target = T;
fn deref(&self) -> &T {
let &Finite(ref value) = self;
value
}
}
impl<T: Float + HeapSizeOf> HeapSizeOf for Finite<T> {
fn heap_size_of_children(&self) -> usize {
(**self).heap_size_of_children()
}
}
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