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[Lua] add __len metafunction for readonly objects

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This commit is contained in:
Petr Mikheev 2023-07-16 06:17:04 +02:00
parent c5789b5543
commit f86a45d60a
1 changed files with 4 additions and 0 deletions
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4
components/lua/luastate.cpp
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@ -246,6 +246,9 @@ namespace LuaUtil
local nextFn, t, firstKey = ipairs(getmetatable(v).t) local nextFn, t, firstKey = ipairs(getmetatable(v).t)
return function(_, k) return nextFn(t, k) end, v, firstKey return function(_, k) return nextFn(t, k) end, v, firstKey
end end
function lenForReadOnly(v)
return #getmetatable(v).t
end
local function nextForArray(array, index) local function nextForArray(array, index)
index = (index or 0) + 1 index = (index or 0) + 1
if index <= #array then if index <= #array then
@ -300,6 +303,7 @@ namespace LuaUtil
meta["__index"] = table; meta["__index"] = table;
meta["__pairs"] = lua["pairsForReadOnly"]; meta["__pairs"] = lua["pairsForReadOnly"];
meta["__ipairs"] = lua["ipairsForReadOnly"]; meta["__ipairs"] = lua["ipairsForReadOnly"];
meta["__len"] = lua["lenForReadOnly"];
lua_newuserdata(luaState, 0); lua_newuserdata(luaState, 0);
sol::stack::push(luaState, meta); sol::stack::push(luaState, meta);