Passing a Stack to modify...

TransformedBG · #1 16-Jan-2009, 13:04

Im not sure if i should be doing this by referance or what... but i want to pass a token *XML tag* to a stack through a function that checks for all my base cases. However i am having trouble passing in the stack and modifying it.. i think its still going out of scope... i just cant remember how to fix that.. i was thinking const stack<string>& stk, but thats if i wanted to modify it without modifying my primary correct? any help woudl be great

CPP / C++ / C Code:

 
stack<string> tagStack;

while (cin >> token){
        if(token[0] != '/0'){
            check = checkTags(token,tagStack);
            cout << tagStack.top();
}

CPP / C++ / C Code:

int checkTags(const string& ONE,stack<string> stk){
    if(ONE != '/0'){
        skt.push(ONE);
    }

// do some more stuff

}

LuciWiz · #2 16-Jan-2009, 13:09

Quote:

Originally Posted by TransformedBG

Im not sure if i should be doing this by referance or what... but i want to pass a token *XML tag* to a stack through a function that checks for all my base cases. However i am having trouble passing in the stack and modifying it.. i think its still going out of scope... i just cant remember how to fix that.. i was thinking const stack<string>& stk, but thats if i wanted to modify it without modifying my primary correct? any help woudl be great

CPP / C++ / C Code:

int checkTags(const string& ONE,stack<string> stk){
    if(ONE != '/0'){
        skt.push(ONE);
    }

// do some more stuff

}

You pass by const reference when you don't want the variable to be modified by the function. In your case, just pass it through non-const reference:

CPP / C++ / C Code:

int checkTags(const string& ONE, stack<string> & stk)

Best regards,
Lucian

TransformedBG · #3 16-Jan-2009, 13:14

Okay i did that it just isnt modifying the stack outside of the function. stack size not growing

LuciWiz · #4 16-Jan-2009, 13:19

Quote:

Originally Posted by TransformedBG

Okay i did that it just isnt modifying the stack outside of the function. stack size not growing

Are you sure your call to push is reached? Step through the code with a debugger or output to the console the branches your program goes through.

TransformedBG · #5 16-Jan-2009, 13:29

yeah i figured it out i forgot to return an int LOL... wow easy things get me... now i just got to finish working out my base cases and getting it to run correctly. Thanks your a wiz!!!

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Passing a Stack to modify...

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