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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"
// forwards
struct s_Universe;
typedef struct s_Universe Universe;
enum eLookupMode
{
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
};
typedef enum eLookupMode LookupMode;
enum eDeepOp
{
eDO_new,
eDO_delete,
eDO_metatable,
eDO_module,
};
typedef enum eDeepOp DeepOp;
typedef void* (*luaG_IdFunction)( lua_State* L, DeepOp op_);
// ################################################################################################
// fnv164 of string "DEEP_VERSION_2" generated at https://www.pelock.com/products/hash-calculator
static constexpr UniqueKey DEEP_VERSION{ 0xB4B0119C10642B29ull };
// should be used as header for full userdata
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
volatile int refcount{ 0 };
};
char const* push_deep_proxy( Universe* U, 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 void* luaG_todeep( lua_State* L, luaG_IdFunction idfunc, int index);
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