vector - struct - one last time

This is a discussion on vector - struct - one last time within the C++ Programming forums, part of the General Programming Boards category; I tried using a class based vector for sorting more than one column. Let's just say I have a lot ...

  1. #1
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    vector - struct - one last time

    I tried using a class based vector for sorting more than one column. Let's just say I have a lot of code that uses that struct and going to class-based caused a lot of problems.

    My next thought was make the first column in the struct a "catch all" in which to hold my data in the order I wanted sorted.

    I've tried that in the below code to no avail. It runs fine but not sorted.

    Code:
    	struct record
    	{
    		std::string sortvalue;
    	    std::string corp;
    	    std::string lastname;
    	    std::string firstname;
    	    std::string lwi;
    	    std::string grade;
    	    std::string tanf;
    	    std::string ssn;
    	};
    
    	std::vector<nsSVector::record*>::iterator start = schoolvector.begin();
    	std::vector<nsSVector::record*>::iterator stop = schoolvector.end();
    
    	while (start != stop) 
    	{
    		if (VD.validateCorp((*start)->corp) == 0)
    		{
    			VD.validateNames("LAST",(*start)->lastname);
    			VD.validateNames("FIRST",(*start)->firstname);
    			VD.validateLWI((*start)->lwi);
    			VD.validateGrade((*start)->grade);
    			VD.validateTANF((*start)->tanf);
    			VD.validateSSN((*start)->ssn);
    			(*start)->sortvalue = (*start)->corp + 
    (*start)->lastname + 
    (*start)->firstname + 
    (*start)->grade + 
    (*start)->ssn;
    			++start;
    		}
    		else
    		{
    			start = schoolvector.erase(start);
    		}
    	}
    
    
    	
    	std::sort( schoolvector.begin(), schoolvector.end() );

  2. #2
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    never mind, I'm trying that class-based vector again.

  3. #3
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    structs and classes are the same thing. Any problems you have with the struct based version will be the same with the class based version. Any solutions you have for the class based version can be applied to the struct based version.

    In the code above, the vector holds pointers, and the sort is using the default sort for the items in the vector. By default, pointers are sorted by their pointer value. You need a specialized sort function that sorts nsSVector::record pointers.

  4. #4
    Frequently Quite Prolix dwks's Avatar
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    structs and classes are the same thing.
    Basicly. structs are public by default and classes are private by default.
    Code:
    (*start)->sortvalue
    Are you sure that's what you want? Is is declared as **start?
    Code:
    	struct record
    	{
    		std::string sortvalue;
    	    std::string corp;
    	    std::string lastname;
    	    std::string firstname;
    	    std::string lwi;
    	    std::string grade;
    	    std::string tanf;
    	    std::string ssn;
    	};
    That creates a structure definition. It doesn't actually create a struct.
    dwk

    Seek and ye shall find. quaere et invenies.

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    "Testing can only prove the presence of bugs, not their absence." -- Edsger Dijkstra
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