allocatable arrays in CLASSes and STRUCTS

This is a discussion on allocatable arrays in CLASSes and STRUCTS within the C++ Programming forums, part of the General Programming Boards category; Hi there, I am using a struct and a Class whose elements may be arrays. I would like though, for ...

  1. #1
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    allocatable arrays in CLASSes and STRUCTS

    Hi there,

    I am using a struct and a Class whose elements may be arrays. I would like though, for these arrays to be dynamically allocatable when I declare them in the Class and main code; how is it supposed to be done in C++?

    I was firstly trying to do it in C, but I prefer to try in C++ because I have files to read and find it easier for them to be read in C++.

    I wrap my code here; it's very simple, however, please let me know if there are more information that you need

    Thank you in advance,
    Best
    S.M

    Code:
    typedef struct VertexTag{
    
    	float x; //x-coord of Vertex
    	float y; //y-coord of Vertex
    	float z; //z-coord of Vertex
    
    } typeVertex;
    
    //*******************************************************************//
    //	Domain class:
    //*******************************************************************//
    class Mesh{
    
    	public:
    		typeVertex	coords[ SIZE_TO_BE_ALLOCATED_DYNAMICALLY ];
    
    		Mesh(void);			// constructor		
    
    };

  2. #2
    C++ Witch laserlight's Avatar
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    Quote Originally Posted by simone.marras
    I would like though, for these arrays to be dynamically allocatable when I declare them in the Class and main code; how is it supposed to be done in C++?
    Generally, we would use a std::vector.
    Quote Originally Posted by Bjarne Stroustrup (2000-10-14)
    I get maybe two dozen requests for help with some sort of programming or design problem every day. Most have more sense than to send me hundreds of lines of code. If they do, I ask them to find the smallest example that exhibits the problem and send me that. Mostly, they then find the error themselves. "Finding the smallest program that demonstrates the error" is a powerful debugging tool.
    Look up a C++ Reference and learn How To Ask Questions The Smart Way

  3. #3
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    Quote Originally Posted by laserlight View Post
    Generally, we would use a std::vector.
    thank you, but if I use a std::vector to declare COORDS, how would I access the elements of the struct?

    thanks again

  4. #4
    The larch
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    Just as you'd do it with an array.
    I might be wrong.

    Thank you, anon. You sure know how to recognize different types of trees from quite a long way away.
    Quoted more than 1000 times (I hope).

  5. #5
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    Thank you a lot, I will try it sometime soon.
    All the best

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