setupvalue

Replaces one upvalue in a Lua function or stack level by one-based index. Invalid stack levels raise “Level out of range”, non-Lua functions raise “Lua function expected”, indexes below 1 raise “Upvalue index starts at 1”, and indexes past the available upvalues raise “Upvalue index is out of range”. debug.setupvalue is an alias.

Cú pháp

setupvalue(target: function | number, index: number, value: any)

Alias

debug.setupvalue

Đối số

Name	Type	Required	Mô tả
`target`	`function \| number`	Yes	Lua function or stack level whose upvalue is modified.
`index`	`number`	Yes	One-based upvalue index.
`value`	`any`	Yes	New value for the upvalue.

Ví dụ

Replace one upvalue in a Lua closure or stack level.

local captured = "before"

local function target()
    return captured
end

print(target())

setupvalue(target, 1, "after")
print(target())

debug.setupvalue(target, 1, "done")
print(target())

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