#include <iostream>
#include <ranges>
#include <vector>
#include <string_view>

int main()
{
	std::vector<int> container{1, 3, 2, 4, 6, 7, 5, 7, 8, 9, 10};
	// Methods for lazy evaluation.
	auto transformed =
		// We start with the container. 
		// This is optional, we can add it later at line 19.
		container
		// Pipe is used to chain operations.
		| std::ranges::views::filter([](int value) { return value % 2 == 0; })
		| std::ranges::views::transform([](int value) { return value * 2; })
		| std::ranges::views::reverse;
	std::cout << "Value" << std::endl;
	for (auto&& item : transformed) {
		std::cout << "- " << item << std::endl;
	}

	// Use with strings is not optimal but possible.
	// The main issues is that we start with line as an container and split it into sub-ranges.
	// Next we need to concert each subrange into string_view.
	// 
	std::string_view line = "Some line\twith tokens      and     white spaces.";
	// Slightly better with lates working draft but ... 
	auto transformation =
		// Split using space.		
		std::ranges::views::split(' ')
		// Magic ~ create strings (start character, size), for start character we need to get the address from an interator.
		| std::ranges::views::transform([](auto&& range) { return std::string_view(&*range.begin(), range.size()); })
		// Remove empty.
		| std::ranges::views::filter([](auto item) { return !item.empty(); });
	std::cout << "Tokens from '" << line << "'" << std::endl;
	for (auto&& token : line | transformation) {
		std::cout << "- '" << token << "'" << std::endl;
	}
}