| c++ Programming Glossary: data.ptrWhy is it so 'hard' to write a for-loop in C++ with 2 loop variables? [duplicate] http://stackoverflow.com/questions/3440066/why-is-it-so-hard-to-write-a-for-loop-in-c-with-2-loop-variables  for struct int myIndex MyElement ptr data 0 Pool First data.ptr data.myIndex data.ptr data.ptr next  blah... Which becomes the.. MyElement ptr data 0 Pool First data.ptr data.myIndex data.ptr data.ptr next  blah... Which becomes the same as struct  int.. ptr data 0 Pool First data.ptr data.myIndex data.ptr data.ptr next  blah... Which becomes the same as struct  int myIndex.. 
 Accessing elements of cvCreateMatND http://stackoverflow.com/questions/6493687/accessing-elements-of-cvcreatematnd   for int z 0 z matA dim 2 .size z  unsigned char ptr matA data.ptr size_t x matA dim 0 .step size_t y matA dim 1 .step size_t z.. 
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