Struct Null 

pub struct Null;

A helper struct for pushing and reading special box.NULL values.

See https://www.tarantool.io/en/doc/latest/reference/reference_lua/box_null/ for more details about box.NULL.

Note that reading this type from lua will work with both regular nil and box.NULL, as well as if there’s no value at all (e.g. no arguments to the lua function). But when pushing this type onto the lua stack the box.NULL value will always be pushed.

See also Nil.

Trait Implementations

impl Clone for Null

fn clone(&self) -> Null

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Null

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Hash for Null

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl<L> LuaRead<L> for Null

where L: AsLua,

fn lua_read_at_position(lua: L, index: NonZeroI32) -> ReadResult<Self, L>

Reads the data from Lua at a given position.

fn lua_read_at_maybe_zero_position(lua: L, index: i32) -> ReadResult<Self, L>

fn n_values_expected() -> i32

fn lua_read(lua: L) -> ReadResult<Self, L>

Reads the data from Lua.

impl Ord for Null

fn cmp(&self, other: &Null) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl PartialEq for Null

fn eq(&self, other: &Null) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl PartialOrd for Null

fn partial_cmp(&self, other: &Null) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

fn lt(&self, other: &Rhs) -> bool

Tests less than (for self and other) and is used by the < operator.

fn le(&self, other: &Rhs) -> bool

Tests less than or equal to (for self and other) and is used by the <= operator.

fn gt(&self, other: &Rhs) -> bool

Tests greater than (for self and other) and is used by the > operator.

fn ge(&self, other: &Rhs) -> bool

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl<L> Push<L> for Null

where L: AsLua,

type Err = Void

Error that can happen when pushing a value.

fn push_to_lua(&self, lua: L) -> Result<PushGuard<L>, (Void, L)>

Pushes the value on the top of the stack.

fn push_no_err(&self, lua: L) -> PushGuard<L>

where <Self as Push<L>>::Err: Into<Void>,

Same as push_to_lua but can only succeed and is only available if Err implements Into<Void>.

impl<L> PushInto<L> for Null

where L: AsLua,

type Err = Void

fn push_into_lua(self, lua: L) -> Result<PushGuard<L>, (Void, L)>

Push the value into lua by value

fn push_into_no_err(self, lua: L) -> PushGuard<L>

where Self: Sized, <Self as PushInto<L>>::Err: Into<Void>,

Same as push_into_lua but can only succeed and is only available if Err implements Into<Void>.

impl Copy for Null

impl Eq for Null

impl<L> PushOne<L> for Null

where L: AsLua,

impl<L> PushOneInto<L> for Null

where L: AsLua,

impl StructuralPartialEq for Null