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Since lua functions are closures, C++ methods that pass arguments by
reference cannot be used directly. The previous approach (boost::ref)
failed with clang. Assume the following:
void foo (float&) { }
static inline float& bar () {
boost::reference_wrapper<float> r (42);
return r.get ();
}
foo ( bar () );
With gcc, "r" goes out of scope after foo's arguments are processed
and all is well.
But with clang, "r" already leave scope when *inlined* bar() returns.
Solution: allocate some user-data on the lua-stack to hold the reference.
There is no reference to this user-data so lua will eventually
garbage collect it.
(theoretically, creating the table which holds the return-values
could trigger an emergency garbage collection when memory is low and
free the reference just while they're being pushed to the table, then
gain FuncArgs<Params> already dereferenced them all as variable on the
C stack -- probably again compiler specific)
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* introduce boost::shared_ptr support
* support enum & const
* allow to add non-class member functions
* STL iterators (vector, list, set, bitset & map)
* support reference arguments (framecnt_t&)
* add support for arrays of basic types (e.g. float*, int*)
* fix compiler warnings
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https://github.com/vinniefalco/LuaBridge
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