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util.promise: Add a string representation

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This commit is contained in:
Kim Alvefur 2018-10-18 13:33:19 +02:00
parent 681b25e427
commit dd2f749996
1 changed files with 4 additions and 0 deletions
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4
util/promise.lua
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@ -1,6 +1,10 @@
local promise_methods = {};
local promise_mt = { __name = "promise", __index = promise_methods };
function promise_mt:__tostring()
return "promise (" .. (self._state or "invalid") .. ")";
end
local function is_promise(o)
local mt = getmetatable(o);
return mt == promise_mt;