optional.hpp

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#pragma once
 
#if __has_include(<optional>) && __cplusplus >= 201703L
#include <optional>
namespace cras
{
  using ::std::optional;
  using ::std::bad_optional_access;
  using ::std::nullopt;
}
#else
#include <cras_cpp_common/external/tl/optional.hpp>
namespace cras
{
  using ::tl::optional;
  using ::tl::bad_optional_access;
  using ::tl::nullopt;
}
#endif
 
#include <type_traits>
 
namespace cras
{
template<typename T>
struct is_optional : public ::std::false_type {};
 
template<typename T>
struct is_optional<::cras::optional<T>> : public ::std::true_type {};
}