Mega Code Archive
Find the maximum element in a range in a list
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/* The following code example is taken from the book
* "The C++ Standard Library - A Tutorial and Reference"
* by Nicolai M. Josuttis, Addison-Wesley, 1999
*
* (C) Copyright Nicolai M. Josuttis 1999.
* Permission to copy, use, modify, sell and distribute this software
* is granted provided this copyright notice appears in all copies.
* This software is provided "as is" without express or implied
* warranty, and with no claim as to its suitability for any purpose.
*/
#include <iostream>
#include <list>
#include <algorithm>
using namespace std;
int main()
{
list<int> coll;
list<int>::iterator pos;
// insert elements from 20 to 40
for (int i=20; i<=40; ++i) {
coll.push_back(i);
}
/* find position of element with value 3
* - there is none, so pos gets coll.end()
*/
pos = find (coll.begin(), coll.end(), // range
3); // value
/* reverse the order of elements between found element and the end
* - because pos is coll.end() it reverses an empty range
*/
reverse (pos, coll.end());
// find positions of values 25 and 35
list<int>::iterator pos25, pos35;
pos25 = find (coll.begin(), coll.end(), // range
25); // value
pos35 = find (coll.begin(), coll.end(), // range
35); // value
/* print the maximum of the corresponding range
* - note: including pos25 but excluding pos35
*/
cout << "max: " << *max_element (pos25, pos35) << endl;
// process the elements including the last position
cout << "max: " << *max_element (pos25, ++pos35) << endl;
}
max: 34
max: 35
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