edit: Operator.hpp: preprocessor check compiler for compatibility

include/aidge/operator/Operator.hpp

@@ -67,8 +67,16 @@ enum class InputCategory : unsigned int {
     OptionalParam = (1 << 2) | Optional, /**< Optional parameter input. */
     All = static_cast<unsigned int>(-1)
 };
+
+
+#ifdef _MSC_VER
+template <>
+constexpr bool enable_bitmask_operators<InputCategory> = true;
+#else
 template <>
 inline constexpr bool enable_bitmask_operators<InputCategory> = true;
+#endif
+
 
 /**
  * @class Operator