Re: a question about STL

From:
Mark P <usenet@fall2005REMOVE.fastmailCAPS.fm>
Newsgroups:
comp.lang.c++
Date:
Fri, 13 Apr 2007 23:09:57 GMT
Message-ID:
<95UTh.3383$2v1.2608@newssvr14.news.prodigy.net>
JDT wrote:

James Kanze wrote:

On Apr 13, 10:13 pm, JDT <jdt_yo...@yahoo.com> wrote:

I am curious if there is a way to just use existing STL functions,
algorithms etc to accomplish the following loop (without a need to write
my own function). I know how to use some STL functions plus my own
function to replace the loop. But that unnecessarily makes code more
complicated. Any advice is much welcome. Thanks.

int nSize;
...
vector<int> v;
v.resize(nSize);
for (int i=0; i<nSize; i++)
  v[i] = i;


You need a special iterator; check out boost::iterators. With
the correct iterator, it's just:

    vector<int> v( boost::counting_iterator< int >( 0 ),
                   boost::counting_iterator< int >( nSize ) ) ;

--
James Kanze (Gabi Software) email: james.kanze@gmail.com
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Hi James,

Do you think MS Visual Studio 2005 supports boost? I copied an example
from the Internet but the compiling process failed. For example, the
compiler complained the following file is not found. Your further help
is appreciated.

#include "boost"

JD


Boost and MS VC++ are compatible but you need to install boost to make
it work. I've done it before and it's not trivial, however there are
good instructions online. Try searching the boost website for more details.

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