INFO: find Function

ID: Q158576

The information in this article applies to:

The Standard C++ Library, used with:
- Microsoft Visual C++, 32-bit Editions, versions 4.2, 5.0, 6.0

SUMMARY

The following sample code illustrates how to use the set::find STL function in Visual C++.

MORE INFORMATION

Required Header


   <set>

Prototype


   template<class _K, class _Pr, class _A>
   class set {
   public:
   // Function 1:

      const_iterator find(const _K& _Kv) const;

   }

NOTE: The class/parameter names in the prototype may not match the version in the header file. Some have been modified to improve readability.

Description

The find function is used to locate an element in a controlled sequence. It returns an iterator to the first element in the controlled sequence whose sort key matches its parameter. If no such element exists, the returned iterator equals end().

Sample Code


////////////////////////////////////////////////////////////////////// 
// 
// Compile options needed: -GX
// 
// SetFind.cpp:
//      Illustrates how to use the find function to get an iterator
//      that points to the first element in the controlled sequence
//      that has a particular sort key.
// 
// Functions:
// 
//    find         Returns an iterator that points to the first element
//                 in the controlled sequence that has the same sort key
//                 as the value passed to the find function. If no such
//                 element exists, the iterator equals end().
// 
// Written by Derek Jamison
// of Microsoft Technical Support,
// Copyright (c) 1996 Microsoft Corporation. All rights reserved.
////////////////////////////////////////////////////////////////////// 

#pragma warning(disable:4786)

#include <set>
#include <iostream>

#if _MSC_VER > 1020   // if VC++ version is > 4.2
   using namespace std;  // std c++ libs implemented in std
   #endif

typedef set<int,less<int>,allocator<int> > SET_INT;

void truefalse(int x)

{
  cout << (x?"True":"False") << endl;
}

void main() {

  SET_INT s1;
  cout << "s1.insert(5)" << endl;
  s1.insert(5);
  cout << "s1.insert(8)" << endl;
  s1.insert(8);
  cout << "s1.insert(12)" << endl;
  s1.insert(12);

  SET_INT::iterator it;
  cout << "it=find(8)" << endl;
  it=s1.find(8);
  cout << "it!=s1.end() returned ";
  truefalse(it!=s1.end());  //  True

  cout << "it=find(6)" << endl;
  it=s1.find(6);
  cout << "it!=s1.end() returned ";
  truefalse(it!=s1.end());  // False
}

Program Output


s1.insert(5)
s1.insert(8)
s1.insert(12)
it=find(8)
it!=s1.end() returned True
it=find(6)
it!=s1.end() returned False

REFERENCES

Visual C++ Books Online: Visual C++ Books; C/C++; Standard C++ Library Reference

Additional query words: STL STLSample find string

Keywords : kbcode kbVC420 kbVC500 kbVC600 kbDSupport STLIss
Version : winnt:4.2,5.0,6.0
Platform : winnt
Issue type : kbinfo