25 lines
649 B
Lua
25 lines
649 B
Lua
-- A reference id : object like a string but for reference ids
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r2.RefIdMetatable =
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{
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__eq = function(op1, op2) return op1.Value == op2.Value end,
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__le = function(op1, op2) return op1.Value <= op2.Value end,
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__lt = function(op1, op2) return op1.Value < op2.Value end,
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__tostring = function(op) return op.Value end
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}
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function r2.RefId(value)
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assert(value ~= r2) -- in case of r2:RefId(value)
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if value == nil then value = "" end
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local refId = { Value = tostring(value) }
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setmetatable(refId, r2.RefIdMetatable)
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return refId
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end
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function r2.isRefId(value)
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return type(value) == "table" and getmetatable(value) == r2.RefIdMetatable
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end
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