local LIBSTUB_MAJOR,LIBSTUB_MINOR="LibStub",2
local LibStub=_G[LIBSTUB_MAJOR]
if not LibStub or LibStub.minor < LIBSTUB_MINOR then
LibStub=LibStub or {libs={},minors={}}
_G[LIBSTUB_MAJOR]=LibStub
LibStub.minor=LIBSTUB_MINOR
function LibStub:NewLibrary(major,minor)
assert(type(major)=="string", "Bad argument #2 to `NewLibrary' (string expected)")
minor=assert(tonumber(strmatch(minor, "%d+")), "Minor version must either be a number or contain a number.")
local oldminor=self.minors[major]
if oldminor and oldminor >=minor then return nil end
self.minors[major],self.libs[major]=minor,self.libs[major] or {}
return self.libs[major],oldminor
end
function LibStub:GetLibrary(major,silent)
if not self.libs[major] and not silent then
error(("Cannot find a library instance of %q."):format(tostring(major)),2)
end
return self.libs[major],self.minors[major]
end
function LibStub:IterateLibraries()
return pairs(self.libs)
end
setmetatable(LibStub,{__call=LibStub.GetLibrary})
end