pub struct TypeId { /* private fields */ }
Expand description
A TypeId
represents a globally unique identifier for a type.
Each TypeId
is an opaque object which does not allow inspection of what’s
inside but does allow basic operations such as cloning, comparison,
printing, and showing.
A TypeId
is currently only available for types which ascribe to 'static
,
but this limitation may be removed in the future.
While TypeId
implements Hash
, PartialOrd
, and Ord
, it is worth
noting that the hashes and ordering will vary between Rust releases. Beware
of relying on them inside of your code!
Returns the TypeId
of the type this generic function has been
instantiated with.
use std::any::{Any, TypeId};
fn is_string<T: ?Sized + Any>(_s: &T) -> bool {
TypeId::of::<String>() == TypeId::of::<T>()
}
assert_eq!(is_string(&0), false);
assert_eq!(is_string(&"cookie monster".to_string()), true);
Run
Performs copy-assignment from
source
.
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Formats the value using the given formatter.
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Compares and returns the maximum of two values.
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Compares and returns the minimum of two values.
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Restrict a value to a certain interval.
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This method tests for
self
and
other
values to be equal, and is used
by
==
.
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This method tests for
!=
. The default implementation is almost always
sufficient, and should not be overridden without very good reason.
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This method returns an ordering between
self
and
other
values if one exists.
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This method tests less than (for
self
and
other
) and is used by the
<
operator.
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This method tests less than or equal to (for
self
and
other
) and is used by the
<=
operator.
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This method tests greater than (for
self
and
other
) and is used by the
>
operator.
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This method tests greater than or equal to (for
self
and
other
) and is used by the
>=
operator.
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Immutably borrows from an owned value.
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Mutably borrows from an owned value.
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Returns the argument unchanged.
Calls U::from(self)
.
That is, this conversion is whatever the implementation of
From<T> for U
chooses to do.
The type returned in the event of a conversion error.
Performs the conversion.
The type returned in the event of a conversion error.
Performs the conversion.