Option for multiple returns in lua_pcall.

Stack index of the Lua registry.

Non-valid stack index

Type of Lua's nil value

Type of Lua booleans

Type of light userdata

Type of Lua numbers. See Number

Type of Lua string values

Type of Lua tables

Type of functions, either normal or CFunction

Type of full user data

Type of Lua threads

Success.

Yielding / suspended coroutine.

A runtime error.

A syntax error.

Memory allocation error. For such errors, Lua does not call the message handler.

Error while running a __gc metamethod. For such errors, Lua does not call the message handler (as this kind of error typically has no relation with the function being called).

Error while running the message handler.

File related error (e.g., the file cannot be opened or read).

Compares for equality (==)

Compares for less than (<)

Compares for less or equal (<=)

Performs addition (+).

Performs subtraction (-)

Performs multiplication (*)

Performs float division (/)

Performs floor division (//)

Performs modulo (%)

Performs exponentiation (^)

Performs mathematical negation (unary -)

Performs bitwise NOT (~)

Performs bitwise AND (&)

Performs bitwise OR (|)

Performs bitwise exclusive OR (~)

Performs left shift (<<)

Performs right shift (>>)

Stops the garbage collector.

Restarts the garbage collector.

Performs a full garbage-collection cycle.

Returns the current amount of memory (in Kbytes) in use by Lua.

Returns the remainder of dividing the current amount of bytes of memory in use by Lua by 1024.

Performs an incremental step of garbage collection.

Sets data as the new value for the pause of the collector (see §2.5) and returns the previous value of the pause.

Sets data as the new value for the step multiplier of the collector (see §2.5) and returns the previous value of the step multiplier.

Returns a boolean that tells whether the collector is running (i.e., not stopped).

Value signaling that no reference was created.

Value signaling that no reference was found.

Value which Lua usually uses as True.

Value which Lua usually uses as False.