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Associative Array
Joined: 28 Jul 2003
Posts: 3
Associative Array
The , in function calls are not sequence points. Eg.
Function(x, y, z); /* no sequence points */
a = 1, b = 2; /* sequence point */
John
--- In Programmers-Town@yahoogroups.com, zimbabaoCEO <zimbabao@y...>
wrote:
> as far as my understanding for "sequence points" goes
> in a++ a is changed only once between sequnce points
> as , is a sequnce point so this is not undefined.
>
> correct me if i`m wrong
> Rajaram
>
> --- Shyan Lam <lam@s...> wrote:
> > See reply embedded...
> >
> > > -----Original Message-----
> > > From: jateen bodkhe [mailto:jateen_b@y...]
> > > Sent: Friday, July 25, 2003 04:45
> > > To: Programmers-Town@yahoogroups.com
> > > Subject: *(&Programmers-Town&)* a small question
> > >
> > > Hello myself jateen,
> > > i have a small question.
> > Here it
> > > is. Please send me tha correct reason for getting
> > such
> > > answer.
> > > int a=10;
> > > printf("%d,%d,%d",a,a--,a++);
> > ^^^^^^^^
> > Undefined behavior.
> > < http://www.eskimo.com/~scs/C-faq/q3.2.html >
> > < http://www.eskimo.com/~scs/C-faq/q3.8.html >
> >
> > > what should be the output?
> >
> > As for undefined behavior, the output can be
> > anything, including no
> > output, program crashes, system crashes,
> > reformatting your hard drive,
> > etc...
> >
> > > will it be 10 10 9 or something else check it and
> > send
> > > the answer with reason if its different that what
> > > might u expect.
> >
> > The reason is because `a` is being modified more at
> > once between
> > sequence points.
> >
> > HTH
> > Shyan
Joined: 19 Jul 2003
Posts: 29
Associative Array
--- Fernando_Concei�o <fernando.listas@...>
wrote:
> Sorry, but what is "LHS", "L-value" and "Maps"?
1. LHS = Left Hand Side (to the "=" sign, means the
side contaning the variable name, the L-value)
2. L-value = the string which is supposed to act as a
variable, i.e. it can be assigned some value
3. Map = A data structure among others like arrays,
queues, dictionaries, vectors, hashmaps, trees etc
HTH
Regards,
Shantanu
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Joined: 25 Jul 2003
Posts: 48
Associative Array
A comma operator indeed defines a sequence point. However, commas in a
function calls that separate parameters is not an operator and therefore
is not a sequence point.
HTH
Shyan
> -----Original Message-----
> From: zimbabaoCEO [mailto:zimbabao@...]
> Sent: Saturday, July 26, 2003 00:51
> To: Programmers-Town@yahoogroups.com
> Subject: RE: *(&Programmers-Town&)* a small question
>
> as far as my understanding for "sequence points" goes
> in a++ a is changed only once between sequnce points
> as , is a sequnce point so this is not undefined.
>
> correct me if i`m wrong
> Rajaram
>
Joined: 08 Jul 2003
Posts: 6
Associative Array
On Fri July 25 2003 10:38, Fernando Conceição wrote:
> Hi all!
> I want to create an class(c++ with wxWindows) to use associative array
> like i use in PHP, var["varIndex"]="value", I know I can make things
> like this var=myarray("index") using the operator() and this is part of
> I want.
> The part I don´t know is to do something like this:
> myarray("index")=var, using () and = in a once.
> If I can´t do in this way, what can I try?
hi
use a template with a vector.
so index is
<template class c,class d>
vector<c> index;
vector<d> value;
don`t bother abt syntax.
Now equate both indexes.
Also placing them in inc order will reduce the time for search.
Also look if u can implement constant pointers/iterators.
which is most important.
also look at boost.org
-suman
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