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It's my mistake for sure. I copied the code from lua-cjson and the finalizer gets called in that code in 5.1

I know it's something stupid but I don't know the C API well enough to fix it. The full code is here

On 12/03/2014 8:27 PM, Ignacio Burgueño wrote:
Unless I'm mistaken, that won't work with Lua 5.1 since the __gc metamethod for tables was introduced in 5.2. In this case, it does nothing. You'll need a userdata to achieve the same effect.

You should take a look at Thijs Schreijer's "Lua Library Template"

For instance, this example does what you want: