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add issubclass method #5

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add issubclass method #5

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15 changes: 14 additions & 1 deletion classic.lua
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Original file line number Diff line number Diff line change
Expand Up @@ -41,7 +41,7 @@ function Object:implement(...)
end


function Object:is(T)
function Object:isinstance(T)
local mt = getmetatable(self)
while mt do
if mt == T then
Expand All @@ -53,6 +53,19 @@ function Object:is(T)
end


function Object:issubclass(T)
assert(rawget(self, "super"), "is not a class")
local mt = self
while mt do
if mt == T then
return true
end
mt = getmetatable(mt)
end
return false
end


function Object:__tostring()
return "Object"
end
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