it-works/ranges/main.cpp

#include <vector>
#include <map>
#include <iostream>

#include "counting_iterator.hpp"
#include "tuple_element.hpp"

void counting_iterator(){
	std::vector<int> v{1,3,37,1337,7};
	
	for(auto x : counted(v)){
		std::cout << "v[" << x.index << "] = " << x.value << std::endl;
	}
	
	for(auto x : counted(v)){
		x.value *= x.index;
	}
	
	for(auto x : counted(v)){
		std::cout << "v[" << x.index << "] = " << x.value << std::endl;
	}
}

void tuple_element (){
	std::map<int, int> m1;
	for(int i = -5; i <= 5; ++i)
		m1[i] = i*i;
	
	for(auto & p : values(m1)){
		p -= 5;
	}
	
	auto const & m = m1;
	for(auto & p : values(m)){		// p is a const ref
		std::cout << p << "\t";
	}
	
	std::cout << std::endl;
	
	for(auto & p : keys(m1)){		// p is a const ref, because keys in a map are const
		std::cout << p << "\t";
	}
	
	std::cout << std::endl;
}
		
int main(){
	counting_iterator();
	tuple_element();
}