Lähettäjä: Roberto Ierusalimschy <roberto@inf.puc-rio.br>
Päiväys: perjantai, 21. helmikuuta 2003 22:33:22 +0200
Vastaanottaja: Multiple recipients of list <lua-l@tecgraf.puc-rio.br>
Aihe: Vastaus: Lua 5 getglobals
Vastaus: lua-l@tecgraf.puc-rio.br
Why does "setglobals" not work on C-functions? Is this deliberate
(seems
unlikely) or due to some implementation problem?
It is deliberate. All C functions share a common environment table
(new name for the old "table of globals", as they are not globals).
A "setglobals" for a C function would change the environment of all
C functions, but would not affect Lua functions (as they have their
independent environments). This is difficult to explain, and does not
seem very useful.
Another question is why C functions do not have independent
environments, like Lua functions. Very few C functions use globals, and
they can use other tables as easily as they use globals. If some C
functions whant an independent environment, they can share a table
via upvalues.
-- Roberto
