Bugfix #1542466 added code to allow mapping Lua nil's <-> C/C++ NULL's

git-svn-id: https://swig.svn.sourceforge.net/svnroot/swig/trunk/SWIG@9256 626c5289-ae23-0410-ae9c-e8d60b6d4f22

Examples/test-suite/lua/voidtest_runme.lua

@@ -0,0 +1,37 @@
+-- demo of lua swig
+require("import")	-- the import fn
+import("voidtest")	-- import lib
+
+-- test calling functions
+voidtest.globalfunc()
+f = voidtest.Foo()
+f:memberfunc()  -- member fns must have : not a .
+
+voidtest.Foo_staticmemberfunc() -- static member fns are still a little messy
+
+v1 = voidtest.vfunc1(f)
+v2 = voidtest.vfunc2(f)
+
+assert(swig_equals(v1,v2)) -- a raw equals will not work, we look at the raw pointers
+
+v3 = voidtest.vfunc3(v1)
+assert(swig_equals(v3,f))
+
+v4 = voidtest.vfunc1(f)
+assert(swig_equals(v4,v1))
+
+v3:memberfunc()
+
+-- also testing nil's support
+-- nil, are acceptable anywhere a pointer is
+n1 = voidtest.vfunc1(nil)
+n2 = voidtest.vfunc2(nil)
+
+assert(n1==nil)
+assert(n2==nil)
+
+n3 = voidtest.vfunc3(n1)
+n4 = voidtest.vfunc1(nil)
+
+assert(n3==nil)
+assert(n4==nil)