Struct PrimitiveOption 

#[repr(C)]
pub struct PrimitiveOption<T: Copy> {
    pub has_value: u8,
    pub _pad: [u8; 7],
    pub value: T,
}

Option for primitive (non-pointer) types.

Memory layout (16 bytes for T=f64/i64, 8 bytes could suffice for smaller T)

Offset  Size  Field
------  ----  -----
  0       1   has_value (0 = None, 1 = Some)
  1       7   _pad (align to 8)
  8    sz(T)  value

Fields

has_value: u8

0 = None, 1 = Some.

_pad: [u8; 7]

Padding to align value to 8 bytes.

value: T

The value (only valid when has_value == 1).

Implementations

impl<T: Copy> PrimitiveOption<T>

pub fn some(value: T) -> Self

Create a Some variant.

pub fn none() -> Self

where T: Default,

Create a None variant.

Safety

The value field is left zeroed and must not be read.

pub fn is_some(&self) -> bool

Whether this is Some.

pub fn is_none(&self) -> bool

Whether this is None.

pub fn get(&self) -> Option<T>

Get the value, if present.