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#include <algorithm>
#include <iostream>
#include <string>
#include <cstring>
#include <iterator>
using namespace std;
bool caseless(string const &left, string const &right)
{
return strcasecmp(left.c_str(), right.c_str()) < 0;
}
int main()
{
string set1[] = { "kilo", "lima", "mike", "november",
"oscar", "papa", "quebec" };
string set2[] = { "papa", "quebec", "romeo"};
string result[7];
string *returned;
copy(result,
set_difference(set1, set1 + 7, set2, set2 + 3, result),
ostream_iterator<string>(cout, " "));
cout << '\n';
string set3[] = { "PAPA", "QUEBEC", "ROMEO"};
copy(result,
set_difference(set1, set1 + 7, set3, set3 + 3, result,
caseless),
ostream_iterator<string>(cout, " "));
cout << '\n';
}
/*
Displays:
kilo lima mike november oscar
kilo lima mike november oscar
*/
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