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#pragma once
/*
* public 'deep' API to be used by external modules if they want to implement Lanes-aware userdata
* said modules will have to link against lanes (it is not really possible to separate the 'deep userdata' implementation from the rest of Lanes)
*/
#ifdef __cplusplus
extern "C" {
#endif // __cplusplus
#include "lua.h"
#ifdef __cplusplus
}
#endif // __cplusplus
#include "lanesconf.h"
#include "uniquekey.h"
#include <atomic>
// forwards
struct Universe;
enum LookupMode
{
eLM_LaneBody, // send the lane body directly from the source to the destination lane
eLM_ToKeeper, // send a function from a lane to a keeper state
eLM_FromKeeper // send a function from a keeper state to a lane
};
enum DeepOp
{
eDO_new,
eDO_delete,
eDO_metatable,
eDO_module,
};
using luaG_IdFunction = void*(*)( lua_State* L, DeepOp op_);
// ################################################################################################
// xxh64 of string "DEEP_VERSION_3" generated at https://www.pelock.com/products/hash-calculator
static constexpr UniqueKey DEEP_VERSION{ 0xB2CC0FD9C0AE9674ull };
// should be used as header for deep userdata
// a deep userdata is a full userdata that stores a single pointer to the actual DeepPrelude-derived object
struct DeepPrelude
{
UniqueKey const magic{ DEEP_VERSION };
// when stored in a keeper state, the full userdata doesn't have a metatable, so we need direct access to the idfunc
luaG_IdFunction idfunc { nullptr };
// data is destroyed when refcount is 0
std::atomic<int> m_refcount{ 0 };
};
char const* push_deep_proxy(lua_State* L, DeepPrelude* prelude, int nuv_, LookupMode mode_);
void free_deep_prelude( lua_State* L, DeepPrelude* prelude_);
LANES_API int luaG_newdeepuserdata( lua_State* L, luaG_IdFunction idfunc, int nuv_);
LANES_API DeepPrelude* luaG_todeep(lua_State* L, luaG_IdFunction idfunc, int index);
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