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#include <numeric>
#include <algorithm>
#include <iterator>
#include <iostream>
#include <string>
using namespace std;
class Cat
{
std::string d_sep;
public:
Cat(string const &sep)
:
d_sep(sep)
{}
string operator()
(string const &s1, string const &s2) const
{
return s1 + d_sep + s2;
}
};
int main()
{
size_t ia1[] = { 1, 2, 3, 4, 5, 6, 7 };
// instead of inner_product:
cout << "The sum of all squares in ";
copy(ia1, ia1 + 7, ostream_iterator<size_t>{ cout, " " });
cout << "is " << transform_reduce(ia1, ia1 + 7, ia1, 0) << '\n';
size_t ia2[] = { 7, 6, 5, 4, 3, 2, 1 };
cout << "The sum of all cross-products in ";
copy(ia1, ia1 + 7, ostream_iterator<size_t>{ cout, " " });
cout << "and ";
copy(ia2, ia2 + 7, ostream_iterator<size_t>{ cout, " " });
cout << "is " << transform_reduce(ia1, ia1 + 7, ia2, 0) << '\n';
string names1[] = { "Frank", "Karel", "Piet" };
string names2[] = { "Brokken", "Kubat", "Plomp"};
cout << "All combined names of ";
copy(names1, names1 + 3, ostream_iterator<string>{ cout, " " });
cout << "and ";
copy(names2, names2 + 3, ostream_iterator<string>{ cout, " " });
cout << "are:" <<
transform_reduce(names1, names1 + 3, names2, "\t"s,
Cat{ "\n\t"}, Cat{ " " }) << '\n';
}
// Displays:
// The sum of all squares in 1 2 3 4 5 6 7 is 140
// The sum of all cross-products in 1 2 3 4 5 6 7 and 7 6 5 4 3 2 1 is 84
// All combined names of Frank Karel Piet and Brokken Kubat Plomp are:
// Frank Brokken
// Karel Kubat
// Piet Plomp
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