Correct way to initialize a typedef strcuture in compile time (with code)

**vinians** · 03-22-2015

Code:

typedef struct token 
{
    int        tokenType;      // what token is that
    int        tokenCode;         // the code of a function if applicable
    char    *tokenString;    // Source token
    double     tokenValue;        // if token is a number
} TToken;

TToken *tokenTab[] = {TK_COMMAND, 001, "PRINT", 0.0,
                      TK_NUMFUNC, 100, "SIN", 0.0,
                      TK_NUMFUNC, 101, "COS", 0.0,
                      TK_NUMFUNC, 102, "TAN", 0.0,
                      TK_NUMFUNC, 103, "CDBL",0.0,
                      TK_NUMFUNC, 104, "LEN", 0.0,
                      TK_STRFUNC, 200, "LEFT", 0.0,
                      TK_STRFUNC, 200, "MID", 0.0,
                      TK_STRFUNC, 200, "RIGHT",0.0,
                      0, 0, NULL, 0.0};

Errors:

I got several warnings and erros, is it possible to declare a table like that ? What's the correct way to declare it ?
Thanks in advance!

**laserlight** · 03-22-2015

You declared tokenTab to be an array of pointers to TToken. Problem is, it looks like you are trying to initialise it as an array of TToken objects. So, you either need to change the type or change the initialisation.

**vinians** · 03-22-2015

Originally Posted by laserlight

You declared tokenTab to be an array of pointers to TToken. Problem is, it looks like you are trying to initialise it as an array of TToken objects. So, you either need to change the type or change the initialisation.

HUmm, I changed it to

Code:

TToken tokenTable[] = {TK_COMMAND, 001, "PRINT", 0.0,
                      TK_NUMFUNC, 100, "SIN",     0.0,
                      TK_NUMFUNC, 101, "COS",     0.0,
                      TK_NUMFUNC, 102, "TAN",     0.0,
                      TK_NUMFUNC, 103, "CDBL",    0.0,
                      TK_NUMFUNC, 104, "LEN",     0.0,
                      TK_STRFUNC, 200, "LEFT",     0.0,
                      TK_STRFUNC, 201, "MID",     0.0,
                      TK_STRFUNC, 202, "RIGHT",    0.0,
                      0, 0, NULL, 0.0};

and it seems to work (perhaps it compiles) but I'm trying to understand why it does not work with use of TToken *tokenTable[], that is, using a vector of pointers...
thank you!

**laserlight** · 03-22-2015

It does not work when you declare an array of pointers because the aggregate that you are using for the initialisation simply does not correspond to an array of pointers.

**vinians** · 03-22-2015

Yeah, its true, I read some papers about it and now I figured it out. Thank you!
I tryed to change the title to "SOLVED" but I found no button to change the title.

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