#ifndef COMPILER_SUPPORT_H

#ifdef __has_include

#  if __has_include(<optional>)
#    include <optional>
#    define have_optional 1
#  elif __has_include(<experimental/optional>)
#    include <experimental/optional>
#    define have_optional 1
#    define have_experimental_optional 1
#  else
#    define have_optional 0
#  endif

#  if __has_include(<variant>)
#    include <variant>
#    define have_variant 1
#  elif __has_include(<experimental/variant>)
#    include <experimental/variant>
#    define have_variant 1
#    define have_experimental_variant 1
#  else
#    define have_variant 0
#  endif

#endif

namespace trygvis {
namespace compiler {

#if have_experimental_optional

template<typename T>
using o = std::experimental::optional<T>;

#elif have_optional

template<typename T>
using o = std::optional<T>;

#endif

#if have_experimental_variant

template<typename... T>
using variant = std::experimental::variant<T>;
using monostate = std::experimental::monostate;

#elif have_variant

template<typename... T>
using variant = std::variant<T...>;
using monostate = std::monostate;

#endif

} // namespace compiler
} // namespace trygvis


#endif