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author | Roberto Ierusalimschy <roberto@inf.puc-rio.br> | 2018-11-07 14:42:05 -0200 |
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committer | Roberto Ierusalimschy <roberto@inf.puc-rio.br> | 2018-11-07 14:42:05 -0200 |
commit | 7f6f70853c8a2730fca2e95d5968ad52cf470bda (patch) | |
tree | 948147a9cf6a5c5eb34232e7547c310eb06eadea /testes/locals.lua | |
parent | b8fed93215a23a3f443c5b0126f0de1725771b44 (diff) | |
download | lua-github-7f6f70853c8a2730fca2e95d5968ad52cf470bda.tar.gz |
To-be-closed variable in 'for' loop separated from the state
The variable to be closed in a generic 'for' loop now is the
4th value produced in the loop initialization, instead of being
the loop state (the 2nd value produced). That allows a loop to
use a state with a '__toclose' metamethod but do not close it.
(As an example, 'f:lines()' might use the file 'f' as a state
for the loop, but it should not close the file when the loop ends.)
Diffstat (limited to 'testes/locals.lua')
-rw-r--r-- | testes/locals.lua | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/testes/locals.lua b/testes/locals.lua index 869ac1ff..28f88e54 100644 --- a/testes/locals.lua +++ b/testes/locals.lua @@ -371,6 +371,8 @@ do x = x - 1 if x > 0 then return x end end, + nil, -- state + nil, -- control variable function () -- closing function numopen = numopen - 1 end @@ -392,12 +394,16 @@ do -- repeat test with '__open' metamethod instead of a function local function open (x) numopen = numopen + 1 + local state = setmetatable({x}, + {__close = function () numopen = numopen - 1 end}) return function (t) -- iteraction function t[1] = t[1] - 1 if t[1] > 0 then return t[1] end end, - setmetatable({x}, {__close = function () numopen = numopen - 1 end}) + state, + nil, + state -- to-be-closed end local s = 0 |