passing locally defined user type to function from function

earachefl · #1 01-Jul-2006, 16:57

If I prototype and call a function from within another function, passing a locally defined user type as a variable, as in:

CPP / C++ / C Code:

//
void deal (const int wDeck[][13], const char *wFace[], const char *wSuit[])
{
    int card;
    
    //locally defined user type hand
    struct hand {
        int face[6];    //only elements 2 - 6 are used
        int suit[6];
    };
    hand pokerHand;
    
    //
    //code removed that actually dealt the hand into pokerHand
    //
    void onePair (const hand);  // function prototype
    onePair (pokerHand);        //call function using local variable pokerHand
}

//function definition - not yet written (obviously)
//called only from function deal
void onePair (const hand newDeal)
{

}

I get the following errors:

Quote:

main.cpp:74: error: non-local function 'void onePair(deal(const int (*)[13], const char**, const char**)::hand)' uses local type 'deal(const int (*)[13], const char**, const char**)::hand'
main.cpp:79: error: ISO C++ forbids declaration of 'hand' with no type
main.cpp:79: error: expected ',' or '...' before 'newDeal'

(note that the line numbers above don't correspond to the code posted)

How do I get this to work? Do I have to use the scope resolution operator somehow? Do I have to define struct hand somewhere other than within the local function? I know I can define hand as a global variable but should I or is there another way?

davekw7x · #2 01-Jul-2006, 17:54

Quote:

Originally Posted by earachefl

How do I get this to work?

The definition for the struct must be visible wherever it is used. By declaring it inside of function deal(), it isn't known anywhere else.

You could do something like this

CPP / C++ / C Code:

// this type of structure will be known everywhere after this in the current file

struct hand {
    int face[6];    //only elements 2 - 6 are used
    int suit[6];
};

void deal (const int wDeck[][13], const char *wFace[], const char *wSuit[])
{
    int card;
    
    hand pokerHand;
    
    //
    //code removed that actually dealt the hand into pokerHand
    //
    void onePair (const hand);  // function prototype
    onePair (pokerHand);        //call function using local variable pokerHand
}

//function definition - not yet written (obviously)
//called only from function deal
void onePair (const hand newDeal)
{

}

Note that the instance pokerHand is still local to its function (it's not a global or file scope variable). Struct definitions and other typedef statements are typically placed in headers, but they don't have to be.

Regards,

Dave

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passing locally defined user type to function from function

Re: passing locally defined user type to function from function