swap_ranges(3C++) - swap_ranges(3C++)
Standard C++ Library Copyright 1998, Rogue Wave Software, Inc.
NAMEswap_ranges
- Exchanges a range of values in one location with those in another.
SYNOPSIS
#include <algorithm>
template <class ForwardIterator1, class ForwardIterator2>
ForwardIterator2
swap_ranges (ForwardIterator1 first1,
ForwardIterator1 last1,
ForwardIterator2 first2);
DESCRIPTION
The swap_ranges algorithm exchanges corresponding values in two ranges,
in the following manner:
For each non-negative integer n < (last - first), the function
exchanges *(first1 + n) with *(first2 + n)). After completing all
exchanges, swap_ranges returns an iterator that points to the end of
the second container (in other words, first2 + (last1 -first1)). The
result of swap_ranges is undefined if the two ranges [first, last) and
[first2, first2 + (last1 - first1)) overlap.
EXAMPLE
//
// swap.cpp
//
#include <vector>
#include <algorithm>
#include <iostream>
using namespace std;
int main()
{
int d1[] = {6, 7, 8, 9, 10, 1, 2, 3, 4, 5};
// Set up a vector
vector<;int> v(d1+0,d1 + 10);
// Output original vector
cout <;< "For the vector: ";
copy(v.begin(),v.end(),
ostream_iterator<int,char>(cout," "));
// Swap the first five elements with the last five elements
swap_ranges(v.begin(),v.begin()+5, v.begin()+5);
// Output result
cout <;< endl << endl
<< "Swapping the first five elements "
<< "with the last five gives: "
<< endl << " ";
copy(v.begin(),v.end(),
ostream_iterator<int,char>(cout," "));
return 0;
}
Program OutputFor the vector: 6 7 8 9 10 1 2 3 4 5Swapping the first five elements with the last five gives:1 2 3 4 5 6 7 8 9 10Swapping the first and last elements gives:10 2 3 4 5 6 7 8 9 1WARNINGS
If your compiler does not support default template parameters, you
always need to supply the Allocator template argument. For instance,
you need 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.
SEE ALSO
iter_swap, swap
Rogue Wave Software 02 Apr 1998 swap_ranges(3C++)
