maybe.hpp

#ifndef ZEN_OPTIONAL_HPP
#define ZEN_OPTIONAL_HPP
 
#include <istream>
#include <optional>
#include <type_traits>
 
#include "zen/config.hpp"
 
ZEN_NAMESPACE_START
 
template<typename T, typename Enabler = void>
struct derive_maybe {
  using type = std::optional<T>;
};
 
// TODO Add a specialization for unicode_char that uses EOF as the `std::nullopt` marker.
 
template<typename T>
using maybe = typename derive_maybe<T>::type;
 
ZEN_NAMESPACE_END
 
#endif // #ifndef ZEN_OPTIONAL_HPP