Re: initialize reference

From:

"Matthias Hofmann" <hofmann@anvil-soft.com>

Newsgroups:

comp.lang.c++.moderated

Date:

25 Jul 2006 09:48:30 -0400

Message-ID:

<44c60270$0$22019$9b4e6d93@newsread2.arcor-online.net>

"jean" <jean.shu@gmail.com> schrieb im Newsbeitrag
news:1153777669.706631.247520@75g2000cwc.googlegroups.com...

Hi,

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;
            }
            customTags.insert( mapElement );
}

Use the ternary operator:

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 =
         m_bDefaultTag ? defineTags : customTags;

     // Note: Inserting to updateTags
     // rather than customTags.
     updateTags.insert( mapElement );
}

As you can see, I also changed the last line of code in MyFunc(). I
guess that this is what you actually mean.

--
Matthias Hofmann
Anvil-Soft, CEO
http://www.anvil-soft.com - The Creators of Toilet Tycoon
http://www.anvil-soft.de - Die Macher des Klomanagers

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