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inplace_merge (STL Samples) 

Illustrates how to use the inplace_merge Standard Template Library (STL) function in Visual C++.


template<class BidirectionalIterator>
   inline void inplace_merge(
      BidirectionalIterator First,
      BidirectionalIterator Middle,
      BidirectionalIterator Last
   )
NoteNote

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

The inplace_merge algorithm merges two sorted subsequences: [First..Middle) and [Middle..Last) in place into a single sorted sequence [First..Last). This version assumes that the ranges [First..Middle) and [Middle..Last) are sorted using operator<. If both ranges contain equal values, the value from the first range will be stored first.

// inplace_merge.cpp
// compile with: /EHsc
//
// Functions:
//   inplace_merge : Merge two sorted sub-sequences in place into a
//                   single sorted list.
//
//   begin - Returns an iterator that points to the first element in a
//           sequence.
//
//   end - Returns an iterator that points one past the end of a sequence.
//////////////////////////////////////////////////////////////////////

// disable warning C4786: symbol greater than 255 characters
// okay to ignore
#pragma warning(disable: 4786)

#include <iostream>
#include <algorithm>
#include <functional>
#include <vector>

using namespace std;


int main()
{
    const int VECTOR_SIZE = 8 ;

    // Define a template class vector of int
    typedef vector<int > IntVector ;

    //Define an iterator for template class vector of strings
    typedef IntVector::iterator IntVectorIt ;

    IntVector Numbers(VECTOR_SIZE) ;

    IntVectorIt start, end, it ;

    // Initialize vector Numbers
    Numbers[0] = 4 ;
    Numbers[1] = 10;
    Numbers[2] = 70 ;
    Numbers[3] = 10 ;
    Numbers[4] = 30 ;
    Numbers[5] = 69 ;
    Numbers[6] = 96 ;
    Numbers[7] = 100;

    start = Numbers.begin() ;   // location of first
                                // element of Numbers

    end = Numbers.end() ;       // one past the location
                                // last element of Numbers

    cout << "Before calling inplace_merge\n" << endl ;

    // print content of Numbers
    cout << "Numbers { " ;
    for(it = start; it != end; it++)
        cout << *it << " " ;
    cout << " }\n" << endl ;

    //merge the elements of Numbers in place
    inplace_merge(start, start + 3, end) ;

    cout << "After calling inplace_merge\n" << endl ;

    // print content of Numbers
    cout << "Numbers { " ;
    for(it = start; it != end; it++)
        cout << *it << " " ;
    cout << " }\n" << endl ;
}
Before calling inplace_merge

Numbers { 4 10 70 10 30 69 96 100  }

After calling inplace_merge

Numbers { 4 10 10 30 69 70 96 100  }

Header: <algorithm>

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