Returning a 2D array from a function

  PRODUCT  :  Borland C++                           NUMBER  :  1547
  VERSION  :  All
       OS  :  All
     DATE  :  July 21, 1993                            PAGE  :  1/2

    TITLE  :  Returning a 2D array from a function




  //--------------------------------------------------------------
  //
  //  Description: Example program demonstrates declaring a
  //  function that  returns a two-dimensional array and a
  //  pointer to a function of that  type.
  //
  //--------------------------------------------------------------

  #include <iostream.h>

  const arraySize = 50;
  const arrayCount = 5;
  const initElem = 10;

  // Func takes an int and returns a pointer to an array of
  // arrayCount arrays of arraySize doubles after initializing
  // the initElem'th element of the first array with the passed
  // double value.
  double (* Foo( double i )) [arraySize]
  {
      // Allocate space ( arrayCount * arraySize *
      // sizeof(double) )
      double (*p)
             [arraySize] = new double [arrayCount] [arraySize];

      // Initialize the initElem'th element of the first array
      p[0][initElem] = i;

      return p;
  }

  int main()
  {
      // Pointer to a function which takes an int and returns a
      // pointer to an open array of arrays of arraySize doubles
      double (* (*FuncPtr)(double) ) [arraySize];

      // The compiler would not allow this if the function
      // prototype and the function pointer were not of
      // compatible types.
      FuncPtr = Foo;

      // Pointer to an open array of arrays of arraySize doubles













  PRODUCT  :  Borland C++                           NUMBER  :  1547
  VERSION  :  All
       OS  :  All
     DATE  :  July 21, 1993                            PAGE  :  2/2

    TITLE  :  Returning a 2D array from a function




      double (*data)[arraySize];

      // Function allocates data space and returns with
      // initElem'th element  of first array initialized to
      // passed value.
      data = FuncPtr( 5.5 );

      cout << "array[0][" << initElem << "]=" << data[0][initElem]
           << endl;

      delete [] data;

      return 0;
  }


  DISCLAIMER: You have the right to use this technical information
  subject to the terms of the No-Nonsense License Statement that
  you received with the Borland product to which this information
  pertains.