RE: [Dev-C++] dynamic allocation and structs

[Per W. <pw...@ia...>]

Same answer as to previous mail.

We were specifically talking about a C implementation.

By the way, a vector is a vector in C, C++, Java, Fortran, Modula 2,
Pascal, ...

It isn't about the language, but about the concept. And it doesn't matter
if I implement it myself, buy an existing library or have it built into
the language.

/Per W

On Fri, 25 Oct 2002, Ioannis Vranos wrote:

> > -----Original Message-----
> > From: Per Westermark [mailto:pw...@ia...] 
> > Sent: Friday, October 25, 2002 11:51 AM
> > To: Ioannis Vranos
> > Cc: 'Dev-C++ Mailing List'
> > Subject: RE: [Dev-C++] dynamic allocation and structs
> > 
> > 
> > The trick is that vector isn't programming. It is a standard 
> > - and very
> > old - mathematical term for a one-dimensional matrix.
> 
> 
> Yes, but when we speak of C++ code, calling a built in array a "vector"
> can only be confusing.
> 
> 
> 
> > There has been
> > millions of vector implementations before STL did a template 
> > version, and
> > the probability of a finding a STL construct in a C program 
> > is not that
> > high :-)
> 
> 
> Yes, but it still can be confusing to C++ programmers.
> 
> 
> 
> > 
> > While code might syntactically switch around between
> > (*a).x,
> > a->x
> > a[0].x
> > 
> > the third form is definitely dangerous to use when a is only 
> > a pointer to
> > a single element. If there is an element zero, the logical 
> > conclusion is
> > that there must be a element one.
> 
> 
> Yes, if there is only one element i would use the -> only. When we have
> more the [] is more suitable. Both are valid.
> 
> 
> 
> 
> > 
> > While one goal of programming is to make the programs work, 
> > it shouldn't
> > be neglected that comming generations of programmers 
> > inherriting old code
> > does immediately see what the code does. When seeing a x[0] 
> > statement, the
> > natural reaction is - or should be - to start hunt for the 
> > total size of
> > the vector.
> 
> 
> Yes. However i did created a 200x100 array on the free store so the
> second [] was suitable. :)
> 
> 
> Ioannis
> 
> * Ioannis Vranos
> * Programming pages: http://www.noicys.freeurl.com
> * Alternative URL: http://run.to/noicys
> 
> 
> 
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