lua_upvalueid

lua_upvalueid[-0, +0, –]

void *lua_upvalueid (lua_State *L, int funcindex, int n);

Returns a unique identifier for the upvalue numbered n from the closure at index funcindex.

These unique identifiers allow a program to check whether different closures share upvalues. Lua closures that share an upvalue (that is, that access a same external local variable) will return identical ids for those upvalue indices.

Parameters funcindex and n are as in function lua_getupvalue, but n cannot be greater than the number of upvalues.

Links:

https://www.lua.org/manual/5.3/manual.html#lua_upvalueid

doc_lua

2017-02-21 04:14:50

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