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#include <algorithm>
#include <string>
#include <iterator>
#include <iostream>
using namespace std;
class Twice
{
public:
bool operator()(size_t first, size_t second) const
{
return first == (second << 1);
}
};
int main()
{
string sarr[] =
{
"alpha", "bravo", "charley", "delta", "echo",
"foxtrot", "golf", "hotel",
"foxtrot", "golf", "hotel",
"india", "juliet", "kilo"
};
string search[] =
{
"foxtrot",
"golf",
"hotel"
};
string *last = sarr + sizeof(sarr) / sizeof(string);
copy
( // sequence starting
find_first_of(sarr, last, search, search + 3),// at 1st 'foxtrot'
last, ostream_iterator<string>{ cout, " " }
);
cout << '\n';
size_t range[] = {2, 4, 6, 8, 10, 4, 6, 8, 10};
size_t nrs[] = {2, 3, 4};
// copy the sequence of values in 'range', starting at the
// first element in 'range' that is equal to twice one of the
// values in 'nrs', and ending at the last element of 'range'
copy
(
find_first_of(range, range + 9, nrs, nrs + 3, Twice{}),
range + 9, ostream_iterator<size_t>{ cout, " " }
);
cout << '\n';
}
/*
Displays:
foxtrot golf hotel foxtrot golf hotel india juliet kilo
4 6 8 10 4 6 8 10
*/
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