#ifndef TMP_STRINGVIEW_H
#define TMP_STRINGVIEW_H

/**
 * @file tmp/stringview.h"
 * @brief partial implementation of C++17 std::string_view
 *
 * see: https://stackoverflow.com/questions/81870/is-it-possible-to-print-a-variables-type-in-standard-c
 * see: https://stackoverflow.com/a/20170989
 * string_view is from "static_string" class
 * to be replaced by std::string_view as soon as possible
 *
 * Adapted, minimal C++ version supported now C++11
 */

#include <stdexcept>

namespace tmp {

class string_view {
	char const* const _p;
	std::size_t const _sz;

public:
	using const_iterator = char const*;

	template<std::size_t N>
	constexpr string_view(char const(&a)[N]) noexcept: _p(a), _sz(N-1) {}
	constexpr string_view(char const*p, std::size_t N) noexcept: _p(p), _sz(N) {}

	constexpr char const*data() const noexcept {return _p;}
	constexpr std::size_t size() const noexcept {return _sz;}

	constexpr const_iterator begin() const noexcept {return _p;}
	constexpr const_iterator end()   const noexcept {return _p + _sz;}

	constexpr char operator[](std::size_t n) const {
		return n < _sz? _p[n] : throw std::out_of_range("string_view");
	}

	explicit operator std::string() const { return {_p, _sz}; }
};

template<typename Ostream>
inline Ostream&operator<<(Ostream &os, string_view const&s) {
	os.write(s.data(), s.size());
	return os;
}

}

#endif