al/eax/fx_slot_index.h

   1 #ifndef EAX_FX_SLOT_INDEX_INCLUDED
   2 #define EAX_FX_SLOT_INDEX_INCLUDED
   3
   4
   5 #include <cstddef>
   6 #include <optional>
   7
   8 #include "api.h"
   9
  10
  11 using EaxFxSlotIndexValue = std::size_t;
  12
  13 class EaxFxSlotIndex : public std::optional<EaxFxSlotIndexValue> {
  14 public:
  15     using std::optional<EaxFxSlotIndexValue>::optional;
  16
  17     EaxFxSlotIndex& operator=(const EaxFxSlotIndexValue &value) { set(value); return *this; }
  18     EaxFxSlotIndex& operator=(const GUID &guid) { set(guid); return *this; }
  19
  20     void set(EaxFxSlotIndexValue index);
  21     void set(const GUID& guid);
  22
  23 private:
  24     [[noreturn]]
  25     static void fail(const char *message);
  26 }; // EaxFxSlotIndex
  27
  28 inline bool operator==(const EaxFxSlotIndex& lhs, const EaxFxSlotIndex& rhs) noexcept
  29 {
  30     if(lhs.has_value() != rhs.has_value())
  31         return false;
  32     if(lhs.has_value())
  33         return *lhs == *rhs;
  34     return true;
  35 }
  36
  37 inline bool operator!=(const EaxFxSlotIndex& lhs, const EaxFxSlotIndex& rhs) noexcept
  38 { return !(lhs == rhs); }
  39
  40 #endif // !EAX_FX_SLOT_INDEX_INCLUDED