Re: initialize reference

From:

=?ISO-8859-15?Q?Stefan_N=E4we?= <please@nospam.net>

Newsgroups:

comp.lang.c++.moderated

Date:

25 Jul 2006 09:45:28 -0400

Message-ID:

<hjt4ae-1c6.ln@news01.atlas.de>

jean schrieb:

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 );
}

1. You can't 're-seat' a reference. Once it's bound, it's bound.
2. Use a function that takes the map<> as a reference:

void updateMap(std::map<std::string, tag_entry >& theMap)
{
     theMap.insert(whatever);
}

an call it like this:

    updateMap(m_bDefaultTag ? defineTags : customTags);

HTH
   Stefan
--
Stefan Naewe
naewe.s_AT_atlas_DOT_de

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