Struct std::mem::Assume

source ·
pub struct Assume {
    pub alignment: bool,
    pub lifetimes: bool,
    pub safety: bool,
    pub validity: bool,
}
🔬This is a nightly-only experimental API. (transmutability #99571)
Expand description

What transmutation safety conditions shall the compiler assume that you are checking?

Fields§

§alignment: bool
🔬This is a nightly-only experimental API. (transmutability #99571)

When true, the compiler assumes that you are ensuring (either dynamically or statically) that destination referents do not have stricter alignment requirements than source referents.

§lifetimes: bool
🔬This is a nightly-only experimental API. (transmutability #99571)

When true, the compiler assume that you are ensuring that lifetimes are not extended in a manner that violates Rust’s memory model.

§safety: bool
🔬This is a nightly-only experimental API. (transmutability #99571)

When true, the compiler assumes that you have ensured that it is safe for you to violate the type and field privacy of the destination type (and sometimes of the source type, too).

§validity: bool
🔬This is a nightly-only experimental API. (transmutability #99571)

When true, the compiler assumes that you are ensuring that the source type is actually a valid instance of the destination type.

Implementations§

🔬This is a nightly-only experimental API. (transmutability #99571)

Do not assume that you have ensured any safety properties are met.

🔬This is a nightly-only experimental API. (transmutability #99571)

Assume only that alignment conditions are met.

🔬This is a nightly-only experimental API. (transmutability #99571)

Assume only that lifetime conditions are met.

🔬This is a nightly-only experimental API. (transmutability #99571)

Assume only that safety conditions are met.

🔬This is a nightly-only experimental API. (transmutability #99571)

Assume only that dynamically-satisfiable validity conditions are met.

🔬This is a nightly-only experimental API. (transmutability #99571)

Assume both self and other_assumptions.

🔬This is a nightly-only experimental API. (transmutability #99571)

Assume self, excepting other_assumptions.

Trait Implementations§

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

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.