GCC - Incompatible Pointer Types Post: 302481388

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Top Forums Programming GCC - Incompatible Pointer Types Post 302481388 by Corona688 on Friday 17th of December 2010 11:11:00 AM

12-17-2010

Registered User

Quote:

Originally Posted by majid.merkava

I want to make a two dimensional array. I know there are better solutions but I'm practising this way. Smilie

It's actually not that bad. You get something that acts like a 2D array without any hardcoded dimensions, that uses the standard [] operators directly without any classes or operator overloading. It also allows the array to be very large, where local variables might be quite limited in maximum size. It's also very simple.

Yours has a hardcoded size of 10 in one dimension, but the idea can be taken farther:

Code:

int r=10, c=10; // The size we want
int n;
int **rows=(int **)malloc(sizeof(int *) * r);
for(n=0; n<r; n++)
{
        rows[n]=malloc(sizeof(int) * c);
        memset(row[n], sizeof(int) * c, 0);
}

rows[5][7]=42;

...

// Can't forget this :D
for(n=0; n<r; n++)
{
        free(rows[n]);
}

free(rows);

Last edited by Corona688; 12-19-2010 at 12:27 PM.. Reason: minor but vital code fix (n<r, not n<c!)

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std::gslice

std::gslice(3cxx)														 std::gslice(3cxx)

NAME

       std::gslice -

SYNOPSIS

   Public Member Functions
       gslice ()
       gslice (size_t, const valarray< size_t > &, const valarray< size_t > &)
       gslice (const gslice &)
       ~gslice ()
       gslice & operator= (const gslice &)
       valarray< size_t > size () const
       size_t start () const
       valarray< size_t > stride () const

   Friends
       class valarray

Detailed Description
       Class defining multi-dimensional subset of an array.

       The slice class represents a multi-dimensional subset of an array, specified by three parameter sets: start offset, size array, and stride
       array. The start offset is the index of the first element of the array that is part of the subset. The size and stride array describe each
       dimension of the slice. Size is the number of elements in that dimension, and stride is the distance in the array between successive
       elements in that dimension. Each dimension's size and stride is taken to begin at an array element described by the previous dimension. The
       size array and stride array must be the same size.

       For example, if you have offset==3, stride[0]==11, size[1]==3, stride[1]==3, then slice[0,0]==array[3], slice[0,1]==array[6],
       slice[0,2]==array[9], slice[1,0]==array[14], slice[1,1]==array[17], slice[1,2]==array[20].

       Definition at line 65 of file gslice.h.

Author
       Generated automatically by Doxygen for libstdc++ from the source code.

libstdc++							  Tue Nov 27 2012						 std::gslice(3cxx)