Enum mlua::MetaMethod

#[non_exhaustive]
pub enum MetaMethod {
    Add,
    Sub,
    Mul,
    Div,
    Mod,
    Pow,
    Unm,
    IDiv,
    BAnd,
    BOr,
    BXor,
    BNot,
    Shl,
    Shr,
    Concat,
    Len,
    Eq,
    Lt,
    Le,
    Index,
    NewIndex,
    Call,
    ToString,
    Pairs,
    IPairs,
    Iter,
    Close,
}

Kinds of metamethods that can be overridden.

Currently, this mechanism does not allow overriding the __gc metamethod, since there is generally no need to do so: UserData implementors can instead just implement Drop.

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

Add

The + operator.

Sub

The - operator.

Mul

The * operator.

Div

The / operator.

Mod

The % operator.

Pow

The ^ operator.

Unm

The unary minus (-) operator.

IDiv

The floor division (//) operator. Requires feature = "lua54/lua53"

BAnd

The bitwise AND (&) operator. Requires feature = "lua54/lua53"

BOr

The bitwise OR (|) operator. Requires feature = "lua54/lua53"

BXor

The bitwise XOR (binary ~) operator. Requires feature = "lua54/lua53"

BNot

The bitwise NOT (unary ~) operator. Requires feature = "lua54/lua53"

Shl

The bitwise left shift (<<) operator.

Shr

The bitwise right shift (>>) operator.

Concat

The string concatenation operator ...

Len

The length operator #.

Eq

The == operator.

Lt

The < operator.

Le

The <= operator.

Index

Index access obj[key].

NewIndex

Index write access obj[key] = value.

Call

The call “operator” obj(arg1, args2, ...).

ToString

The __tostring metamethod.

This is not an operator, but will be called by methods such as tostring and print.

Pairs

The __pairs metamethod.

This is not an operator, but it will be called by the built-in pairs function.

Requires feature = "lua54/lua53/lua52"

IPairs

Available on crate features lua52 or luajit52 only.

The __ipairs metamethod.

This is not an operator, but it will be called by the built-in ipairs function.

Requires feature = "lua52"

Iter

Available on crate feature luau only.

The __iter metamethod.

Executed before the iteration begins, and should return an iterator function like next (or a custom one).

Requires feature = "lua"

Close

Available on crate feature lua54 only.

The __close metamethod.

Executed when a variable, that marked as to-be-closed, goes out of scope.

More information about to-be-closed variabled can be found in the Lua 5.4 documentation.

Requires feature = "lua54"

Implementations

impl MetaMethod

pub const fn name(self) -> &'static str

Returns Lua metamethod name, usually prefixed by two underscores.

Trait Implementations

impl AsRef<str> for MetaMethod

fn as_ref(&self) -> &str

Converts this type into a shared reference of the (usually inferred) input type.

impl Clone for MetaMethod

fn clone(&self) -> MetaMethod

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for MetaMethod

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

Formats the value using the given formatter.

impl Display for MetaMethod

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

Formats the value using the given formatter.

impl Hash for MetaMethod

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 PartialEq<MetaMethod> for &str

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

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

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

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

impl PartialEq<MetaMethod> for String

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

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

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

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

impl PartialEq for MetaMethod

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

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

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

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

impl Copy for MetaMethod

impl Eq for MetaMethod

impl StructuralEq for MetaMethod

impl StructuralPartialEq for MetaMethod