Don't understand this struct
Author
struct _Node{
Node *next;
Node *child;
Node *parent;
};
The structure name has an _ , but in the program the code still works even a variable is declared like
Node node;
why why why?
Thanks
because that's not what you saw. (bad you! no cookie!) what you saw is this:
typedef struct _Node{
Node *next;
Node *child;
Node *parent;
} Node;
which typedefs "struct _Node" to "Node". It's a C thing.
EDIT: oh, yeah, people sometimes do it with #defines, too.
How appropriate. You fight like a cow.
[edited by - sneftel on July 2, 2003 12:19:45 PM]
typedef struct _Node{
Node *next;
Node *child;
Node *parent;
} Node;
which typedefs "struct _Node" to "Node". It's a C thing.
EDIT: oh, yeah, people sometimes do it with #defines, too.
How appropriate. You fight like a cow.
[edited by - sneftel on July 2, 2003 12:19:45 PM]
Because you don't have to write (C only, C++ does not require you to write struct anyways, afaik)
struct _Node node;
but only
Node node;
I guess writing
typedef struct
{
Node *next;
Node *child;
Node *parent;
}
Node;
Might've been more obvious, without adding both Node and struct _Node (One is redundant, no?). *shrugs*
edit: typos
[edited by - Wildfire on July 2, 2003 12:25:37 PM]
struct _Node node;
but only
Node node;
I guess writing
typedef struct
{
Node *next;
Node *child;
Node *parent;
}
Node;
Might've been more obvious, without adding both Node and struct _Node (One is redundant, no?). *shrugs*
edit: typos
[edited by - Wildfire on July 2, 2003 12:25:37 PM]
// This is Cstruct Node {Node *next;Node *child;Node *parent;};// Now to create an instance...struct Node node; // What the hell is that extra baggage?...And, of course, that would have to be repeated every time you need to reference the type (like in a function declaration).
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Author
Thanks for your reply
the actual code is there
00135 struct _Lib3dsNode {
00136 Lib3dsUserData user;
00137 Lib3dsNode *next;\
00138 Lib3dsNode *childs;\
00139 Lib3dsNode *parent;\
00140 Lib3dsNodeTypes type;\
00141 Lib3dsWord node_id;\
00142 char name[64];\
00143 Lib3dsWord flags1;\
00144 Lib3dsWord flags2;\
00145 Lib3dsWord parent_id;
00146 Lib3dsMatrix matrix;
00147 Lib3dsNodeData data;
00148 };
00149
00150 extern LIB3DSAPI Lib3dsNode* lib3ds_node_new_ambient();
see what I mean?
the _Lib3dsNode (line 135)
and the line 150 function returns Lib3dsNode * they look different
the actual code is there
00135 struct _Lib3dsNode {
00136 Lib3dsUserData user;
00137 Lib3dsNode *next;\
00138 Lib3dsNode *childs;\
00139 Lib3dsNode *parent;\
00140 Lib3dsNodeTypes type;\
00141 Lib3dsWord node_id;\
00142 char name[64];\
00143 Lib3dsWord flags1;\
00144 Lib3dsWord flags2;\
00145 Lib3dsWord parent_id;
00146 Lib3dsMatrix matrix;
00147 Lib3dsNodeData data;
00148 };
00149
00150 extern LIB3DSAPI Lib3dsNode* lib3ds_node_new_ambient();
see what I mean?
the _Lib3dsNode (line 135)
and the line 150 function returns Lib3dsNode * they look different
look for a #define Lib3dsNode struct _Lib3dsNode
[edited by - daerid on July 2, 2003 1:28:35 PM]
[edited by - daerid on July 2, 2003 1:28:35 PM]
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