Simplifies definitions of world Invalid*ID constants

Author: louis-langholtz

Library/include/playrho/BodyID.hpp

@@ -42,7 +42,7 @@ using BodyID = detail::IndexingNamedType<BodyCounter, struct BodyIdentifier>;
 /// @brief Invalid body ID value.
 /// @details A special, reserved value of a @c BodyID that represents/identifies an _invalid_ body.
 /// @see BodyID, IsValid.
-constexpr auto InvalidBodyID = static_cast<BodyID>(static_cast<BodyID::underlying_type>(-1));
+constexpr auto InvalidBodyID = BodyID{static_cast<BodyID::underlying_type>(-1)};
 
 /// @brief Determines validity of given value by comparing against <code>InvalidBodyID</code>.
 /// @return true if not equal to @c InvalidBodyID , else false.

Library/include/playrho/ContactID.hpp

@@ -43,8 +43,7 @@ using ContactID = detail::IndexingNamedType<ContactCounter, struct ContactIdenti
 /// @brief Invalid contact ID value.
 /// @details A special, reserved value of a @c ContactID that represents/identifies an _invalid_ contact.
 /// @see ContactID, IsValid.
-constexpr auto InvalidContactID =
-    static_cast<ContactID>(static_cast<ContactID::underlying_type>(-1));
+constexpr auto InvalidContactID = ContactID{static_cast<ContactID::underlying_type>(-1)};
 
 /// @brief Determines validity of given value by comparing against <code>InvalidContactID</code>.
 /// @return true if not equal to @c InvalidContactID , else false.

Library/include/playrho/JointID.hpp

@@ -42,7 +42,7 @@ using JointID = detail::IndexingNamedType<JointCounter, struct JointIdentifier>;
 /// @brief Invalid joint ID value.
 /// @details A special, reserved value of a @c JointID that represents/identifies an _invalid_ joint.
 /// @see JointID, IsValid.
-constexpr auto InvalidJointID = static_cast<JointID>(static_cast<JointID::underlying_type>(-1));
+constexpr auto InvalidJointID = JointID{static_cast<JointID::underlying_type>(-1)};
 
 /// @brief Determines validity of given value by comparing against <code>InvalidJointID</code>.
 /// @return true if not equal to @c InvalidJointID , else false.

Library/include/playrho/ShapeID.hpp

@@ -42,7 +42,7 @@ using ShapeID = detail::IndexingNamedType<ShapeCounter, struct ShapeIdentifier>;
 /// @brief Invalid shape ID value.
 /// @details A special, reserved value of a @c ShapeID that represents/identifies an _invalid_ shape.
 /// @see ShapeID, IsValid.
-constexpr auto InvalidShapeID = static_cast<ShapeID>(static_cast<ShapeID::underlying_type>(-1));
+constexpr auto InvalidShapeID = ShapeID{static_cast<ShapeID::underlying_type>(-1)};
 
 /// @brief Determines validity of given value by comparing against <code>InvalidShapeID</code>.
 /// @return true if not equal to @c InvalidShapeID , else false.