实现Lua中数据类型的源码分享

 90 /* 
 91 ** Union of all Lua values 
 92 */ 
 93 typedef union Value Value; 
100 /* 
101 ** Tagged Values. This is the basic representation of values in Lua, 
102 ** an actual value plus a tag with its type. 
103 */ 
104  
105 #define TValuefields  Value value_; int tt_ 
400 struct lua_TValue { 
401  TValuefields; 
402 }; 

78 #define LUA_TNIL    0 
79 #define LUA_TBOOLEAN    1 
80 #define LUA_TLIGHTUSERDATA 2 
81 #define LUA_TNUMBER   3 
82 #define LUA_TSTRING   4 
83 #define LUA_TTABLE   5 
84 #define LUA_TFUNCTION    6 
85 #define LUA_TUSERDATA    7 
86 #define LUA_TTHREAD   8 

 96 #define numfield  lua_Number n;  /* numbers */ 
103 typedef LUA_NUMBER lua_Number;(lua.h) 
392 #define LUA_NUMBER   double(luaconf.h) 
391 union Value {  
392  GCObject *gc;  /* collectable objects */ 
393  void *p;     /* light userdata */ 
394  int b;      /* booleans */ 
395  lua_CFunction f; /* light C functions */ 
396  numfield     /* numbers */ 
397 }; 

185 union GCObject { 
186  GCheader gch; /* common header */ 
187  union TString ts; 
188  union Udata u; 
189  union Closure cl; 
190  struct Table h; 
191  struct Proto p; 
192  struct UpVal uv; 
193  struct lua_State th; /* thread */ 
194 };