Lift restriction on functions and userdata as table keysHEADmaster

As demonstrated by the unit tests, there is no problem with using a function or a userdata as a table key, as long as they are transferable

1 files changed, 12 insertions, 8 deletions

diff --git a/tests/errhangtest.lua b/tests/errhangtest.lua
index 5b3f0c0..819bc10 100644
--- a/tests/errhangtest.lua
+++ b/tests/errhangtest.lua
@@ -42,19 +42,23 @@ if true then
         print "OK"
 end
 
--- send a table that contains a function
+-- =================================================================================================
+-- send a table that contains a function, both as key and value
+-- =================================================================================================
+
 if true then
         print "\n#### send table with a function"
-        local fun = function() print "function test ok" end
-        local t_in = { [fun] = fun, fun = fun }
+        local fun = function() print "function test ok" return 42 end
+        local t_in = { [fun] = fun, ["fun"] = fun }
         print(pcall(linda.send, linda, 'test', t_in))
-        local k,t_out = linda:receive('test') -- read the contents successfully sent
-        t_out.fun()
-        -- t_out should contain a single entry, as [fun] = fun should have been discarded because functions are not acceptable keys
+        local k, t_out = linda:receive('test') -- read the contents successfully sent
+        -- t_out should contain two entries, just like t_in
         local count = 0
         for k,v in pairs(t_out) do count = count + 1 end
-        assert(count == 1)
-        print "OK"
+        assert(count == 2)
+        assert(t_out["fun"] == t_out[t_out.fun]) -- t_out[t_out.fun] should be identical to t_out["fun"]
+        assert(t_out["fun"] ~= fun) -- even if the function is not the original one but a copy
+        assert(t_out["fun"]() == t_out[t_out.fun]() and t_out["fun"]() == fun()) -- all functions should return the same value, since they are the same
 end
 
 -- send a string