INFO: STL Sample for the Predicate Version of inplace_merge Function

ID: Q156900

The information in this article applies to:

Microsoft Visual C++, 32-bit Editions, versions 4.2, 5.0, 6.0

SUMMARY

The sample code below illustrates how to use the predicate version of the inplace_merge STL function and the begin and end functions in Visual C++.

MORE INFORMATION

Required Header


   <algorithm>

Prototype


   template<class BidirectionalIterator, class Compare> inline

       void inplace_merge(BidirectionalIterator first,
                          BidirectionalIterator middle,
                          BidirectionalIterator last,
                          Compare compare)

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

Description

The inplace_merge algorithm merges two sorted sub-sequences: [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 the compare function. If both ranges contain equal values, the value from the first range will be stored first.

Sample Code


////////////////////////////////////////////////////////////////////// 
// 
// Compile options needed: /GX
// 
// inplace_mergeP.cpp : Illustrates how to use the predicate version of
//                      the inplace_merge function.
// 
// Functions:
// 
//    inplace_merge - Merge two sorted sub-sequences in place into a
//                    single sorted list using the compare function.
// 
//    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.
// 
// Written by Kalindi Sanghrajka
// of Microsoft Product Support Services,
// Software Core Developer Support.
// Copyright (c) 1996 Microsoft Corporation. All rights reserved.
////////////////////////////////////////////////////////////////////// 

// disable warning C4786: symbol greater than 255 character,
// okay to ignore

#pragma warning(disable: 4786)

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

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

void main()

{

    const int VECTOR_SIZE = 8 ;

    // Define a template class vector of int
    typedef vector<int, allocator<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, less<int>()) ;

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

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

}

Program Output is:


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  }

REFERENCES

Visual C++ Books On Line: Visual C++ Books:C/C++:Standard C++ Library Reference.

Additional query words: STL STLSample inplace_merge begin end

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