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   <TITLE>C++ & MFC - Extension to the STL find_if and for_each</TITLE>
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<!-- Article Title -->Extension to the STL find_if and for_each
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This article was contributed by <!-- Author Email --><A HREF="mailto:mss@tartus.com"><!-- Author Name -->Michael Scherotter</A>.

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<p>The stl algorithms for_each and find_if are inadequate when
you need more data for the predicate.  Here are two new algorithms
TDfind_if and TDfor_each which solve that problem.

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<PRE><TT><FONT COLOR="#990000">
To use:

std::list&ltOBJECT&gt theList;

class DATA
{
public:
    bool IsValid(const OBJECT& rObject) const;
    void OperateOn(OBJECT& rObject) const;
};

bool IsValid(OBJECT theObject, DATA theData)
{
    return theData.IsValid(theObject);
}

void DoOperation(OBJECT theObject, DATA theData)
{
    theData.OperateOn(theObject);
}

DATA theData;

OBJECT theObject = ::TDFind_if(theList.begin(), theList.end(), IsValid, theData);
or
::TDfor_each(theList.begin(), theList.end(), DoOperation, theData);

// CODE STARTS HERE:
/////////////////////////////////////////////////////////////////
// This is like the Standard c++ algorithm find_if, but it takes a second parameter
template&ltclass _II, class _Pr, class T_DATA&gt inline 
_II
TDfind_if(
  _II _F, // First iterator
  _II _L, // Last iterator
  _Pr _P, // Predicate: a static function that returns bool having two
paramters
  T_DATA dwData)
{
    for (; _F != _L; ++_F)
    {
        if (_P(*_F, dwData))
        {
            break;
        }
    }

    return (_F);
}


template&ltclass _II, class _Fn, class T_DATA&gt inline
void
TDfor_each(
  _II _F,
  _II _L,
  _Fn _Op,
  T_DATA dData)
{
    for (; _F != _L; ++_F)
    {
        _Op(*_F, dData);
    }
}
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<!-- Posted / Update  date mm/dd/yy - add to the list -->
<p>Date Posted: <!-- date here -->5/4/98
<br>Posted by: <A HREF="mailto:Azathoth@Cyberdude.com"><!-- Author Name -->Pat Laplante</A>.

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