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#include <algorithm>
#include <iostream>
#include <iterator>
#include <vector>
#include <functional>
using namespace std;
int main()
{
int ia[] = { 10, 20, 30 };
cout << "Sequence: ";
copy(ia, ia + 3, ostream_iterator<int>(cout, " "));
cout << "\n"
"15 can be inserted before " <<
*lower_bound(ia, ia + 3, 15) << "\n"
"35 can be inserted after " <<
(lower_bound(ia, ia + 3, 35) == ia + 3 ?
"the last element" : "???") << '\n';
cout << "Sequence: ";
copy(ia, ia + 3, ostream_iterator<int>(cout, " "));
cout << "\n"
"15 can be inserted before " <<
*lower_bound(ia, ia + 3, 15, less<int>()) << "\n"
"35 can be inserted before " <<
(lower_bound(ia, ia + 3, 35, less<int>()) == ia ?
"the first element " : "???") << '\n';
vector<int> array{ 5, 10, 20, 20, 20, 30 };
auto iter = lower_bound(array.begin(), array.end(), 20,
[&](int &arrayEl, int value)
{
cout << "Comparing " << arrayEl <<
" (index: " << (&arrayEl - &array[0]) << ")"
" to " << value << '\n';
return arrayEl < value;
}
);
cout << "New 20 to insert at idx " << (iter - array.begin()) << '\n';
}
// Displays:
// Sequence: 10 20 30
// 15 can be inserted before 20
// 35 can be inserted after the last element
// Sequence: 10 20 30
// 15 can be inserted before 20
// 35 can be inserted before ???
// Comparing 20 (index: 3) to 20
// Comparing 10 (index: 1) to 20
// Comparing 20 (index: 2) to 20
// New 20 to insert at idx 2
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