Dynamic array problem 1

[McBugzz]

I need to read some file into a 2d array. The filesize is unknown, but it can vary from bytes to kylobytes, or more. The actual problem is how to initialize a dynamic 2d array. If I write smth like

float* map;

, then I can't write a function that returns map[j] etc.

The program is planned to be smth like this:

class Map
{
public:
//...

private:
float* map; // or some other way of initialising
};

...

Map::Map( void )
{
// the needed sise of the array is unknown yet

// reading the file, calculating it's size

// map = new something - allocating memory

// using map[j] element
}

I know this is a stoopid question, but I can't figure out how it's done.

 

[Cagliostro]

2nd array sounds like pointer to pointer:

float** x = new float[COLOR=red]*[/color][numOfArrays];
for(i = 0; i < numOfArrays; i++)
{
    x[i] = new float[numberOfElementsInArray_i];
}

the above operations you will incapsulate in your class Map. By the way, there is an STL map(std::map) what you could use.

Ion Filipski

ICQ: 95034075
AIM: IonFilipski
filipski@excite.com