Array Declaration in class

[DavidG24]

hey guys,

I want to create a class that has an array of unsigned integers whereby the constructor takes in a single unsigned integer to be the size of the array, i.e.

So for I have, in myclass.h

class myclass
{
private:
unsigned int grades[]; //(i)
public:
myclass(unsigned int Size)
};

In myclass.cpp
#include "myclass.h"

myclass:myclass(unsigned int Size)
{
grades = unsigned int[Size]; //(ii)
}

int main(void)
{
myclass Test(10);
return 0;
}

When I build this (In Visual Studio 2005 .NET), I can the following error messages,
in reference to (i)
warning C4200: nonstandard extension used : zero-sized array in struct/union
in reference to (ii)
error C2062: type 'unsigned int' unexpected

Where am I going wrong??

Thanks in Advance,

David

[Skizmo]

unsigned int grades[];

Your array has no size.

unsigned int grades[10];

now it has. But what you are trying should look like this:

unsigned int *grades;
grades = new int[10];
...

delete []grades.

[Lindley]

If you write it that way, you'll have to define the destructor, copy constructor, and operator= as well in order to ensure the class objects don't become corrupted. (Alternatively you can simply define the destructor and disable the other two by declaring them private.)

If you want to save all that effort, declare grades as a std::vector<unsigned int>. Then the default-generated versions of each of those functions will be good enough.

[cilu]

An article for std::vector: http://www.codeguru.com/Cpp/Cpp/cpp_...icle.php/c4027.