Article ID: 157285 - Last Review: December 10, 2003 - Revision: 3.0

STL Sample for the Predicate Persion of upper_bound Function

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SUMMARY

The sample code below illustrates how to use the predicate version of upper_bound STL function in Visual C++.

MORE INFORMATION

Required Header

   <algorithm>
				

Prototype

   template<class ForwardIterator, class T, class Compare> inline
       ForwardIterator upper_bound(ForwardIterator first,
                                   ForwardIterator last,
                                   const T& value,
                                   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 upper_bound algorithm returns the last location in the sequence that value can be inserted such that the order of the sequence [first..last) is maintained.

upper_bound returns an iterator positioned at the location that value can be inserted in the range [first..last), or returns last if no such position exists.

This version assumes the range [first..last) is sorted sequentially using the compare function.

Sample Code

////////////////////////////////////////////////////////////////////// 
// 
// Compile options needed: /GX
// 
// upper_bound.cpp : Illustrates how to use the predicate version
//                   of the upper_bound function.
// 
// Functions:
// 
//    upper_bound : Return the upper bound within a range.
// 
// 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>
using namespace std;

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, location ;

    // 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

    //sort Numbers using the function object less<int>()
    //upper_bound assumes that Numbers is sorted
    //using the "compare" (less<int>() in this case)
    //function
    sort(start, end, less<int>()) ;

    // print content of Numbers
    cout << "Numbers { " ;
    for(it = start; it != end; it++)

        cout << *it << " " ;
    cout << " }\n" << endl ;

    //return the highest location at which 10 can be inserted
    // in Numbers
    location = upper_bound(start, end, 10, less<int>()) ;

    cout << "Last location  for element 10 in Numbers is: "
        << location - start << endl ;
}
				
Program Output is:
Numbers { 4 10 10 30 69 70 96 100  }
				
Last location for element 10 in Numbers is: 3

REFERENCES

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

APPLIES TO
  • The Standard C++ Library, when used with:
    • Microsoft Visual C++ 4.2 Professional Edition
    • Microsoft Visual C++ 4.2 Enterprise Edition
    • Microsoft Visual C++ 5.0 Learning Edition
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