Re: ptr_fun & tolower confusion

From:

James Kanze <james.kanze@gmail.com>

Newsgroups:

comp.lang.c++

Date:

Fri, 4 Jul 2008 13:19:07 -0700 (PDT)

Message-ID:

<4da9269a-8457-493d-930e-6621050d74be@z66g2000hsc.googlegroups.com>

On Jul 4, 11:34 am, Kai-Uwe Bux <jkherci...@gmx.net> wrote:

Soumen wrote:

Just curious, but...

Slightly modified from the archive:

#include <tr1/memory>
#include <cstdlib>
#include <locale>

template < typename CharT >
class to_lower {

  typedef std::ctype< CharT > char_type;

  std::tr1::shared_ptr< std::locale > the_loc_ptr;
  char_type const * the_type_ptr;

public:

  to_lower ( std::locale const & r_loc = std::locale() )
    : the_loc_ptr ( new std::locale ( r_loc ) )

Why the new, and the smart pointer? I just use a locale member.
(If it's part of an actual application, I'll often forego
keeping a copy of the locale anyway---most of the applications I
work on don't play around with locales, so I'm generally sure
that the locale I'm using won't go away.)

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James Kanze (GABI Software) email:james.kanze@gmail.com
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