Trait sgx_tstd::cmp::PartialEq1.0.0[][src]

#[lang = "eq"]
pub trait PartialEq<Rhs = Self> where
    Rhs: ?Sized
{
#[must_use]
fn eq(&self, other: &Rhs) -> bool;
#[must_use]
fn ne(&self, other: &Rhs) -> bool { ... } }

Trait for equality comparisons which are partial equivalence relations.

This trait allows for partial equality, for types that do not have a full equivalence relation. For example, in floating point numbers NaN != NaN, so floating point types implement PartialEq but not Eq.

Formally, the equality must be (for all a, b and c):

Note that these requirements mean that the trait itself must be implemented symmetrically and transitively: if T: PartialEq<U> and U: PartialEq<V> then U: PartialEq<T> and T: PartialEq<V>.

Derivable

This trait can be used with #[derive]. When derived on structs, two instances are equal if all fields are equal, and not equal if any fields are not equal. When derived on enums, each variant is equal to itself and not equal to the other variants.

How can I implement PartialEq?

PartialEq only requires the eq method to be implemented; ne is defined in terms of it by default. Any manual implementation of ne must respect the rule that eq is a strict inverse of ne; that is, !(a == b) if and only if a != b.

Implementations of PartialEq, PartialOrd, and Ord must agree with each other. It's easy to accidentally make them disagree by deriving some of the traits and manually implementing others.

An example implementation for a domain in which two books are considered the same book if their ISBN matches, even if the formats differ:

enum BookFormat { Paperback, Hardback, Ebook }
struct Book {
    isbn: i32,
    format: BookFormat,
}

impl PartialEq for Book {
    fn eq(&self, other: &Book) -> bool {
        self.isbn == other.isbn
    }
}

let b1 = Book { isbn: 3, format: BookFormat::Paperback };
let b2 = Book { isbn: 3, format: BookFormat::Ebook };
let b3 = Book { isbn: 10, format: BookFormat::Paperback };

assert!(b1 == b2);
assert!(b1 != b3);

Examples

let x: u32 = 0;
let y: u32 = 1;

assert_eq!(x == y, false);
assert_eq!(x.eq(&y), false);

Required Methods

This method tests for self and other values to be equal, and is used by ==.

Provided Methods

This method tests for !=.

Implementations on Foreign Types

impl PartialEq<CannotReallocInPlace> for CannotReallocInPlace
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impl PartialEq<AllocErr> for AllocErr
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impl<'a> PartialEq<Utf8LossyChunk<'a>> for Utf8LossyChunk<'a>
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impl<T> PartialEq<Poll<T>> for Poll<T> where
    T: PartialEq<T>, 
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impl PartialEq<LayoutErr> for LayoutErr
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impl PartialEq<Layout> for Layout
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impl PartialEq<Duration> for Duration
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impl PartialEq<sgx_uswitchless_worker_type_t> for sgx_uswitchless_worker_type_t
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impl PartialEq<sgx_exception_vector_t> for sgx_exception_vector_t
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impl PartialEq<sgx_rsa_result_t> for sgx_rsa_result_t
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impl PartialEq<sgx_device_status_t> for sgx_device_status_t
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impl PartialEq<sgx_quote_sign_type_t> for sgx_quote_sign_type_t
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impl PartialEq<sgx_ra_key_type_t> for sgx_ra_key_type_t
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impl PartialEq<sgx_exception_type_t> for sgx_exception_type_t
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impl PartialEq<sgx_uswitchless_worker_event_t> for sgx_uswitchless_worker_event_t
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impl PartialEq<sgx_status_t> for sgx_status_t
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impl PartialEq<sgx_rsa_key_type_t> for sgx_rsa_key_type_t
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impl PartialEq<sgx_dh_session_role_t> for sgx_dh_session_role_t
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impl PartialEq<sgx_generic_ecresult_t> for sgx_generic_ecresult_t
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impl PartialEq<SeekFrom> for SeekFrom
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Implementors