Call Lua functions without side effects
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- Subject: Call Lua functions without side effects
- From: "Peter LaDow" <pladow@...>
- Date: 2008年6月12日 11:01:39 -0700
I'm not sure if the subject aptly describes my question. But it'll have to do.
I've spent the last day doing google searches and perusing the mailing
list archives. Seems what I am looking for may be common, but I can't
find exactly what I'm looking for.
What I'd like to do is have a Lua script expose a list of functions
that are callable from C/C++. But I do not want to "execute" the Lua
script. For example, assume I have the following script (call it
foo.lua):
function foo()
print "foo"
end
function bar()
print "bar"
end
And in my C/C++, I do the following:
luaL_loadfile(L, "foo.lua");
But immediately following this with something like:
lua_getglobal(L, "foo");
Returns nil, since the script has not been run yet (i.e. with a call
to lua_call/lua_pcall). Since I am not the owner of such Lua scripts,
I only want to call specific functions, not to have the script run any
arbitrary code. For example, if the user did something like:
function foo()
print "foo"
end
print "I want to do whatever I want! Who cares about the side effects!"
Now loading and running such as script has a side effect.
How can I load a Lua script and call a function without any other side
effects (such as executed code)? Perhaps more like a compile and
load, without the execution?
Thanks,
Pete
--
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"To love for the sake of being loved is human; to love for the sake
of loving is Angelic." -- Alphonse de Lamartine