static casting problem

This is a discussion on static casting problem within the C++ Programming forums, part of the General Programming Boards category; hey every1 slight problem with casting if u could spare the time to have a quick look and c wat ...

  1. #1
    Registered User
    Join Date
    Mar 2002
    Posts
    22

    static casting problem

    hey every1
    slight problem with casting if u could spare the time to have a quick look and c wat is going wrong
    thanks alot
    Code:
    class JppVariable{
    public:
    	string name;
    	string type;
    };
    class JppSimple: public JppVariable{
    public:
    	int simple;
    	JppSimple(string _name, string _type, int _value);
    };
    JppSimple::JppSimple(string _name, string _type, int _value){
    	name = _name;
    	type = _type;
    	simple = _value;
    		 
    }
    //small but simple inheritance tree
    //later i try this
    
    vector <JppVariable> Variables;
    JppSimple test = JppSimple("anything", "SIMPLE", 5);
    Variables.push_back(test);
    
    JppSimple temp = static_cast<JppSimple>(Variables[0]);
    i thought that this should work but i get two errors:
    error C2440: 'static_cast' : cannot convert from 'class JppVariable' to 'class JppSimple'
    error C2512: 'JppSimple' : no appropriate default constructor available
    can anyone tell me where i am going wrong
    thanks for your time
    rxg00u

  2. #2
    Registered User
    Join Date
    Dec 2001
    Posts
    479
    what does this part do:

    class JppSimple:

    maybe u ment class JppSimple
    {
    //or...
    //...i dont know
    }

  3. #3
    Registered User
    Join Date
    Mar 2002
    Posts
    22

    im not sure

    sorry but im not sure i know what u mean?
    ClassJppsimple extends JppVaraible and has the paramerters shown above and the constructor above sorry if this is not what you meant.
    rxg00u

  4. #4
    Registered User
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    Dec 2001
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    479
    send your entire code i think i know the problem (if u havent solved it yet)
    please let me know if u have

  5. #5
    Registered User
    Join Date
    Mar 2002
    Posts
    22
    hi soory for disturbing u ,
    however i hav not solved it but i have approached it a diffrent way i now am using pointers to store in my vector for some reason casting pointers works better than casting actual objects ( do u know a reason for this as it would be a good bit of knowledge), anyway thanks for ur time and all ur help
    yours pants
    (rxg00u)

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