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debug.upvaluejoin

  debug.upvaluejoin( function func1, number upvalueIndex1, function func2, number upvalueIndex2 )
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Description

This function was removed due to security concerns.

Makes an upvalue of func1 refer to an upvalue of func2. Both functions provided must be Lua-defined, otherwise an error is thrown.

Arguments

1 function func1
2 number upvalueIndex1
The index of the upvalue in func1.
3 function func2
4 number upvalueIndex2
The index of the upvalue in func2.

Example

Example code to demonstrate how the function works.

local x = 5 local y = 8 -- 1st upvalue refers to 'x' local variable -- 2st upvalue refers to 'y' local variable local function Add() return x + y end local z = 12 -- 1st upvalue refers to 'z' local variable -- 2st upvalue refers to 'x' local variable local function Subtract() return z - x end print(Add()) -- Expected: 13 --[[ Makes the 2nd upvalue of 'Add' refer to the 1st upvalue of 'Subtract'. The 2nd upvalue of 'Add' is stil 'y', but the function will now use the the 1st upvalue of 'Subtract' in its place. ]] debug.upvaluejoin(Add, 2, Subtract, 1) print(Add()) -- Expected: 17 -- Show that debug.upvaluejoin did not modify the values of the variables print(x, y, z) -- Expected: 5, 8, 12
Output:
13 17 5 8 12

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