Re: [luabind] luabind and std::multimap

[Tom N. <td...@sp...>]

I did some work a while ago with direct access to stl containers from 
lua, I'll see if I can dig up the code this evening.

This is a pre-coffee suggestion, but rather than exporting the pairs you 
may want to consider writing a set of adapters and including them in 
luabind itself. The one for the multimap itself would present itself as 
a table. The keys into the table could then be presented as tables 
themselves which iterate across std::pair< std::lower_bound, 
std::upper_bound >

On 02/14/2012 04:33 AM, irukandji wrote:
> Hi everyone, sorry for sending this mail but i wasnt able to find the
> answer anywhere else.
>
> I dont want to make a wrapper around multimap or convert the data to a
> table as this brings
> useless copying of data, so the idea was to export the std::pair class
> and use it as it is
> from multimap iterators. The ::first is working just fine and outputs
> the data stored as a key, but
> the ::second fails and i am unable to figure out why. Can anyone maybe
> at least say that this is
> not possible so i can stop banging my head against the wall? :) Thank
> you in advance...
>
> // c++ part
> std::multimap<std::string, std::string>  m_multimap;
>
> luabind::module(pLuaState)
> [
> 	luabind::class_<  std::pair<const std::string, std::string>  >
> ("MultimapPair")
> 	.property("key",&std::pair<const std::string, std::string>::first )
> 	.property("val",&std::pair<const std::string, std::string>::second )
> ];
>
> luabind::module(pLuaState)
> [
> 	luabind::class_<CTest>("CTest")
> 	.def_readwrite("multimap",&CTest::m_multimap,
> luabind::return_stl_iterator)
> ];
>
> // luapart
> function testclass( ctest )
>     for data in ctest.multimap do
>        trace(data.key)
>        trace(data.value)
>     end
> end
>
>
>
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