Re: Is CArray best for this...

Norbert Unterberg <nunterberg@newsgroups.nospam>
Fri, 18 Jan 2008 20:17:50 +0100
Giovanni Dicanio schrieb:

"David Wilkinson" <> ha scritto nel messaggio

Hi David,

Strangely enough, I wrote the following piece of code just yesterday

typedef std::map<CString, CString> StringMap;
StringMap m_itemMap;
CListBox m_keyListBox;

void CMyDlg::DisplayItems()
  for (StringMap::const_iterator it = m_itemMap.begin(); it !=
m_itemMap.end(); ++it)

I may misunderstand David C., but I think that he would prefer a "cleaner"
style, like what C# Dictionary offers, e.g.:

  Dictionary< string, string > itemMap;
  foreach ( string key in itemMap )
      // Write key ... or add it to list box or whatever
      DoSomething( key );

If I remember, that code is even wrong, the element type of a Dictionary<> is a
KeyValuePair<> which is not much different from the C++ std::pair<>:

    Dictionary< string, string > itemMap;
    foreach ( KeyValuePair<string, string> element in itemMap )
        // Write key ... or add it to list box or whatever
        DoSomething( element );

And the C++ version can be even shorter:

    #include <algorithm>
    for_each (itemMap.begin(), iremMap.end(), DoSomething);

So he may want a 'foreach' keyword to be added to C++, and kind of "simpler"
collections than STL (however, STL is very powerful).

See, for_each is already there! But it works a little different ...


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