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// src/traits/is_nan.rs : `IsNAN`
/// Trait defining instance method `is_nan() : bool` that indicates
/// whether the implementing type instance has a value that is deemed to be
/// "not a number" (as in so for [`f32::NAN`] [`f64::NAN`]).
///
/// # Additional Implementations on Foreign Types
///
/// ## Built-in Types
///
/// If the feature `"implement-IsNAN-for-built_ins"`
/// is defined (as it is by `"default"`), then this is also implemented
/// for the following types:
/// - [`f32`];
/// - [`f64`];
pub trait IsNAN {
fn is_nan(&self) -> bool;
}
#[cfg(all(not(test), not(feature = "nostd")))]
impl<T : IsNAN + ?Sized> IsNAN for Box<T> {
fn is_nan(&self) -> bool {
(**self).is_nan()
}
}
#[cfg(all(not(test), not(feature = "nostd")))]
impl<T : IsNAN + ?Sized> IsNAN for std::rc::Rc<T> {
fn is_nan(&self) -> bool {
(**self).is_nan()
}
}
#[cfg(feature = "implement-IsNAN-for-built_ins")]
mod impl_for_built_ins {
#![allow(non_snake_case)]
macro_rules! implement_IsNAN_ {
($type:tt) => {
impl super::IsNAN for $type {
#[inline]
fn is_nan(&self) -> bool {
$type::is_nan(*self)
}
}
};
}
implement_IsNAN_!(f32);
implement_IsNAN_!(f64);
}
// ///////////////////////////// end of file //////////////////////////// //