CODEWITHSUNDEEP
c++c
Narek
Narek

Reputation: 39881

Difference of the following snippets

Please tell me what is the difference of 

typedef struct Tcl_ObjType {
    char *name;
    Tcl_FreeInternalRepProc *freeIntRepProc;
    Tcl_DupInternalRepProc *dupIntRepProc;
    Tcl_UpdateStringProc *updateStringProc;
    Tcl_SetFromAnyProc *setFromAnyProc;
} Tcl_ObjType;

and

struct Tcl_ObjType {
    char *name;
    Tcl_FreeInternalRepProc *freeIntRepProc;
    Tcl_DupInternalRepProc *dupIntRepProc;
    Tcl_UpdateStringProc *updateStringProc;
    Tcl_SetFromAnyProc *setFromAnyProc;
};

I have see the first version here: http://www.tcl.tk/man/tcl8.5/TclLib/ObjectType.htm , and don't know why it is written as it is.

Upvotes: 4

Views: 144

Answers (2)

Darren
Darren

Reputation: 70718

You've gave the structure a type definition (In layman terms, provided an alternate name to an existing type):

Using your first example, you can then use it to reference objects/declare new objects via: 

Tcl_ObjType newObj;

Upvotes: 1

Luchian Grigore
Luchian Grigore

Reputation: 258548

For C++, there is no difference.

If this was a C program and you used the first variant, you could do:

Tcl_ObjType instanceOfStructure;

instead of

struct Tcl_ObjType instanceOfStructure;

Upvotes: 9

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