pub struct ReprOptions {
    pub int: Option<IntType>,
    pub align: Option<Align>,
    pub pack: Option<Align>,
    pub flags: ReprFlags,
    pub field_shuffle_seed: u64,
Expand description

Represents the repr options provided by the user,


int: Option<IntType>align: Option<Align>pack: Option<Align>flags: ReprFlagsfield_shuffle_seed: u64

The seed to be used for randomizing a type’s layout

Note: This could technically be a [u8; 16] (a u128) which would be the “most accurate” hash as it’d encompass the item and crate hash without loss, but it does pay the price of being larger. Everything’s a tradeoff, a u64 seed should be sufficient for our purposes (primarily -Z randomize-layout)


Returns the discriminant type, given these repr options. This must only be called on enums!

Returns true if this #[repr()] should inhabit “smart enum layout” optimizations, such as representing Foo<&T> as a single pointer.

Returns true if this #[repr()] should inhibit struct field reordering optimizations, such as with repr(C), repr(packed(1)), or repr(<int>).

Returns true if this type is valid for reordering and -Z randomize-layout was enabled for its declaration crate

Returns true if this #[repr()] should inhibit union ABI optimisations.

Trait Implementations

Returns a copy of the value. Read more
Performs copy-assignment from source. Read more
Formats the value using the given formatter. Read more
Returns the “default value” for a type. Read more
This method tests for self and other values to be equal, and is used by ==. Read more
This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason. Read more

Auto Trait Implementations

Blanket Implementations

Gets the TypeId of self. Read more
Immutably borrows from an owned value. Read more
Mutably borrows from an owned value. Read more
This method turns the parameters of a DepNodeConstructor into an opaque Fingerprint to be used in DepNode. Not all DepNodeParams support being turned into a Fingerprint (they don’t need to if the corresponding DepNode is anonymous). Read more
This method tries to recover the query key from the given DepNode, something which is needed when forcing DepNodes during red-green evaluation. The query system will only call this method if fingerprint_style() is not FingerprintStyle::Opaque. It is always valid to return None here, in which case incremental compilation will treat the query as having changed instead of forcing it. Read more

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 resulting type after obtaining ownership.
Creates owned data from borrowed data, usually by cloning. Read more
Uses borrowed data to replace owned data, usually by cloning. Read more
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.


Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...) attributes. Please see the Rust Reference’s “Type Layout” chapter for details on type layout guarantees.

Size: 16 bytes