fwd.hpp

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#pragma once
 
namespace yaclib {
 
#define YACLIB_DEFINE_VOID_COMPARE(type)                                                                               \
  constexpr bool operator==(type, type) noexcept {                                                                     \
    return true;                                                                                                       \
  }                                                                                                                    \
  constexpr bool operator!=(type, type) noexcept {                                                                     \
    return false;                                                                                                      \
  }                                                                                                                    \
  constexpr bool operator<(type, type) noexcept {                                                                      \
    return false;                                                                                                      \
  }                                                                                                                    \
  constexpr bool operator<=(type, type) noexcept {                                                                     \
    return true;                                                                                                       \
  }                                                                                                                    \
  constexpr bool operator>=(type, type) noexcept {                                                                     \
    return true;                                                                                                       \
  }                                                                                                                    \
  constexpr bool operator>(type, type) noexcept {                                                                      \
    return false;                                                                                                      \
  }
 
#define YACLIB_DEFINE_VOID_TYPE(type)                                                                                  \
  struct type {};                                                                                                      \
  YACLIB_DEFINE_VOID_COMPARE(type)
 
YACLIB_DEFINE_VOID_TYPE(Unit);
YACLIB_DEFINE_VOID_TYPE(StopTag);
 
struct [[nodiscard]] StopError;
 
template <typename V = void, typename E = StopError>
class [[nodiscard]] Result;
 
template <typename V = void, typename E = StopError>
class [[nodiscard]] Task;
 
template <typename V, typename E>
class FutureBase;
 
template <typename V = void, typename E = StopError>
class [[nodiscard]] Future;
 
template <typename V = void, typename E = StopError>
class [[nodiscard]] FutureOn;
 
template <typename V = void, typename E = StopError>
class [[nodiscard]] Promise;
 
}  // namespace yaclib