Enum mlua::Value

source ·
pub enum Value<'lua> {
Expand description

A dynamically typed Lua value. The String, Table, Function, Thread, and UserData variants contain handle types into the internal Lua state. It is a logic error to mix handle types between separate Lua instances, and doing so will result in a panic.



The Lua value nil.


The Lua value true or false.


A “light userdata” object, equivalent to a raw pointer.


An integer number.

Any Lua number convertible to a Integer will be represented as this variant.


A floating point number.


Available on crate feature luau only.

A Luau vector.


An interned string, managed by Lua.

Unlike Rust strings, Lua strings may not be valid UTF-8.


Reference to a Lua table.


Reference to a Lua function (or closure).


Reference to a Lua thread (or coroutine).


Reference to a userdata object that holds a custom type which implements UserData. Special builtin userdata types will be represented as other Value variants.


Error is a special builtin userdata type. When received from Lua it is implicitly cloned.


Compares two values for equality.

Equality comparisons do not convert strings to numbers or vice versa. Tables, Functions, Threads, and Userdata are compared by reference: two objects are considered equal only if they are the same object.

If Tables or Userdata have __eq metamethod then mlua will try to invoke it. The first value is checked first. If that value does not define a metamethod for __eq, then mlua will check the second value. Then mlua calls the metamethod with the two values as arguments, if found.

Converts the value to a generic C pointer.

The value can be a userdata, a table, a thread, a string, or a function; otherwise it returns NULL. Different objects will give different pointers. There is no way to convert the pointer back to its original value.

Typically this function is used only for hashing and debug information.

Trait Implementations

Converts this type into a shared reference of the (usually inferred) input type.
Returns a copy of the value. Read more
Performs copy-assignment from source. Read more
Formats the value using the given formatter. Read more
Creates a value from an iterator. Read more
Performs the conversion.
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
Serialize this value into the given Serde serializer. Read more
Performs the conversion.

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.