allocatable arrays in CLASSes and STRUCTS

simone.marras · 03-14-2009, 09:27 AM

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		

};

**laserlight** · 03-14-2009, 10:29 AM

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.

simone.marras · 03-14-2009, 10:37 AM

Quote:

Originally Posted by laserlight

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

anon · 03-14-2009, 10:38 AM

Just as you'd do it with an array.

simone.marras · 03-14-2009, 10:50 AM

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

03-14-2009, 09:27 AM	#1
simone.marras Registered User Join Date: Aug 2006 Posts: 61	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 };
simone.marras is offline

03-14-2009, 10:50 AM	#5
simone.marras Registered User Join Date: Aug 2006 Posts: 61	Thank you a lot, I will try it sometime soon. All the best
simone.marras is offline

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