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NoRawLoops.cpp

#include <algorithm>
#include <iostream>
#include <iterator>
#include <string>
#include <vector>

template<typename C>
void pr(C const&c)
{
	for (auto const& e : c)
		std::cout << e << '\n';
	std::cout << '\n';
}

template<typename C1, typename C2, typename C3>
void pp(C1 const&c1, C2 const& c2, C3 const& c3)
{
	auto b1 = begin(c1);
	auto b2 = begin(c2);
	auto b3 = begin(c3);
	auto e1 = end(c1);
	auto e2 = end(c2);
	auto e3 = end(c3);
	for (; b1 != e1 && b2 != e2 && b3!= e3; ++b1, ++b2,++b3)
		std::cout << *b1 << '\t' << *b2 << '\t' << *b3 << '\n';
	std::cout << '\n';
}

template<typename RandIt>
auto slide(RandIt f, RandIt l, RandIt p) -> std::pair<RandIt,RandIt>
{
	if (p < f)
		return {p, std::rotate(p,f,l)};
	if (l < p)
		return {std::rotate(f,l,p), p};
	return {f,l};
}

template<typename BiIt, typename U>
auto gather(BiIt f, BiIt l, BiIt p, U u) -> std::pair<BiIt, BiIt>
{
	return {std::stable_partition(f, p, std::not1(u)),
		std::stable_partition(p, l, u)};
}

int main()
{
	using S = std::string;
	using VS = std::vector<S>;
	VS const vs = { "0 adam", "1 berti", "2 cesar", "3 david", "4 erik",
	                "5 fredr", "6 gusta", "7 haral", "8 ivar", "9 johan",
	                "10karl", "11ludvi", "12morte", "13nikla", "14Oscar",
	                "15Proud", "16qvint" };
	auto vsc1 = vs;
	auto f = begin(vsc1) + 3;
	auto l = f + 4;
	auto p = l + 5;
	std::rotate(f, l, p);

	auto vsc2 = vs;
	p = begin(vsc2) + 3;
	f = p + 5;
	l = f + 4;
	std::rotate(p,f,l);

	pp(vs, vsc1, vsc2);
}