cpp-lazy-stream/include/stream/detail/traits.h

//
//  traits.hpp
//  stream
//
//  Created by Sam Jaffe on 6/24/17.
//

#pragma once

#include <utility>

namespace stream::traits {
template <typename C> using ref_t = decltype(*std::begin(std::declval<C>()));
template <typename C> using value_type = std::decay_t<ref_t<C>>;
template <typename C> using cref_t = std::add_const_t<ref_t<C>>;
}