Default example cpp by kq

example.cpp

#include <cstdlib>
#include <cstdint>
#include <ctime>

#include <algorithm>
#include <deque>
#include <functional>
#include <iomanip>
#include <iostream>
#include <list>
#include <map>
#include <random>
#include <set>
#include <sstream>
#include <string>
#include <thread>
#include <utility>

using namespace std;

#define DBG(x) { cout << left << setw(50) << #x << boolalpha << (x) << endl; }

#include <boost/algorithm/string/join.hpp>
#include <boost/range/adaptor/transformed.hpp>

template<typename T,
		 typename=typename enable_if<!is_same<typename decay<decltype(*begin(declval<T>()))>::type,char>::value,int>::type>
auto operator<<(ostream& o, T&& t) -> decltype((begin(t),end(t),declval<ostream>()))&;

template<typename T>
typename remove_reference<T>::type const&
as_const(T&& t);

string operator "" _s(char const* msg, size_t size){
	return string(msg, size);
}

int main()
{
	vector<int> x{1,3,3,7};
	DBG(x);
}

template<typename T,
		 typename=typename enable_if<!is_same<typename decay<decltype(*begin(declval<T>()))>::type,char>::value,int>::type>
auto operator<<(ostream& o, T&& t) -> decltype((begin(t),end(t),declval<ostream>()))&{

	using boost::adaptors::transformed;
	using boost::algorithm::join;

	typedef typename decay<decltype(*begin(t))>::type value_type;

//	auto f = static_cast<string(*)(typename decay<decltype(*begin(t))>::type)>(std::to_string);
//	auto f = [](auto in) -> string { return to_string(in); };
	auto f = [](value_type in) { stringstream s; s << in; return s.str(); };
	o << "{ "
	  << join(t | transformed(f), ", ")
	  << "}";
	return o;
}

template<typename T>
typename remove_reference<T>::type const&
as_const(T&& t){
	return t;
}