Re: initialize reference

From:

"Victor Bazarov" <v.Abazarov@comAcast.net>

Newsgroups:

comp.lang.c++.moderated

Date:

25 Jul 2006 07:22:08 -0400

Message-ID:

<r82dnRfhs-5wH1jZnZ2dnUVZ_s6dnZ2d@comcast.com>

jean wrote:

I have the following code. Basically, I want to insert to different
map depends on m_bDefaultTag . I know I need to initialize
updateTags. But how? Is there a way to achieve my goal? Thanks.

class tag_entry
{
string m_name;
int value;
}

;

void MyFunc()
{
           std::map<std::string, tag_entry >& customTags =
GetCustomTags();
           std::map<std::string, tag_entry >& defineTags =
GetDefineTags();
           std::map<std::string, tag_entry >& updateTags;

           if( m_bDefaultTag ) {
                 updateTags = defineTags;
           }
           else {
                 updateTags = customTags;
           }

This is a very common idiom where the ternary op is used:

std::map<std::string, tag_entry> & updateTags =
m_bDefaultTag ? defineTags : customTags;

customTags.insert( mapElement );
}

V
--
Please remove capital 'A's when replying by e-mail
I do not respond to top-posted replies, please don't ask

[ See http://www.gotw.ca/resources/clcm.htm for info about ]
[ comp.lang.c++.moderated. First time posters: Do this! ]