Algorithm
Finds the maximum value in a range.
None
#include <algorithm>
template <class ForwardIterator>
ForwardIterator
max_element(ForwardIterator first, ForwardIterator last);
template <class ForwardIterator, class Compare>
ForwardIterator
max_element(ForwardIterator first, ForwardIterator last,
Compare comp);
The max_element algorithm returns an iterator that denotes the maximum element in a sequence. If the sequence contains more than one copy of the element, the iterator points to its first occurrence. The optional argument comp defines a comparison function that can be used in place of the default operator<.
Algorithm max_element returns the first iterator i in the range [first, last) such that for any iterator j in the same range the following corresponding conditions hold:
!(*i < *j)
or
comp(*i, *j) == false.
Exactly max((last - first) - 1, 0) applications of the corresponding comparisons are done for max_element.
//
// max_elem.cpp
//
#include <algorithm>
#include <vector>
#include <iostream>
using namespace std;
int main(void)
{
typedef vector<int>::iterator iterator;
int d1[5] = {1,3,5,32,64};
// set up vector
vector<int> v1(d1,d1 + 5);
// find the largest element in the vector
iterator it1 = max_element(v1.begin(), v1.end());
// it1 = v1.begin() + 4
// find the largest element in the range from
// the beginning of the vector to the 2nd to last
iterator it2 = max_element(v1.begin(), v1.end()-1,
less<int>());
// it2 = v1.begin() + 3
// find the smallest element
iterator it3 = min_element(v1.begin(), v1.end());
// it3 = v1.begin()
// find the smallest value in the range from
// the beginning of the vector plus 1 to the end
iterator it4 = min_element(v1.begin()+1, v1.end(),
less<int>());
// it4 = v1.begin() + 1
cout << *it1 << " " << *it2 << " "
<< *it3 << " " << *it4 << endl;
return 0;
}
Program Output
64 32 1 3
If your compiler does not support default template parameters, then you always need to supply the Allocator template argument. For instance, you have to write:
vector<int,allocator<int> >
instead of:
vector<int>
If your compiler does not support namespaces, then you do not need the using declaration for std.