author | skidd13 |
Sun, 22 Jun 2008 15:21:51 +0000 | |
changeset 11049 | f8bbc9635251 |
parent 10229 | fba3f9fa44d7 |
permissions | -rw-r--r-- |
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/* $Id$ */ |
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/** @file enum_type.hpp Type (helpers) for enums */ |
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#ifndef ENUM_TYPE_HPP |
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#define ENUM_TYPE_HPP |
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/** Some enums need to have allowed incrementing (i.e. StationClassID) */ |
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#define DECLARE_POSTFIX_INCREMENT(type) \ |
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FORCEINLINE type operator ++(type& e, int) \ |
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{ \ |
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type e_org = e; \ |
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e = (type)((int)e + 1); \ |
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return e_org; \ |
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} \ |
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FORCEINLINE type operator --(type& e, int) \ |
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{ \ |
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type e_org = e; \ |
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e = (type)((int)e - 1); \ |
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return e_org; \ |
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} |
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/** Operators to allow to work with enum as with type safe bit set in C++ */ |
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# define DECLARE_ENUM_AS_BIT_SET(mask_t) \ |
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FORCEINLINE mask_t operator | (mask_t m1, mask_t m2) {return (mask_t)((int)m1 | m2);} \ |
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FORCEINLINE mask_t operator & (mask_t m1, mask_t m2) {return (mask_t)((int)m1 & m2);} \ |
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FORCEINLINE mask_t operator ^ (mask_t m1, mask_t m2) {return (mask_t)((int)m1 ^ m2);} \ |
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FORCEINLINE mask_t& operator |= (mask_t& m1, mask_t m2) {m1 = m1 | m2; return m1;} \ |
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FORCEINLINE mask_t& operator &= (mask_t& m1, mask_t m2) {m1 = m1 & m2; return m1;} \ |
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FORCEINLINE mask_t& operator ^= (mask_t& m1, mask_t m2) {m1 = m1 ^ m2; return m1;} \ |
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FORCEINLINE mask_t operator ~(mask_t m) {return (mask_t)(~(int)m);} |
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/** Informative template class exposing basic enumeration properties used by several |
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* other templates below. Here we have only forward declaration. For each enum type |
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* we will create specialization derived from MakeEnumPropsT<>. |
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* i.e.: |
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* template <> struct EnumPropsT<Track> : MakeEnumPropsT<Track, byte, TRACK_BEGIN, TRACK_END, INVALID_TRACK> {}; |
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* followed by: |
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* typedef TinyEnumT<Track> TrackByte; |
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*/ |
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template <typename Tenum_t> struct EnumPropsT; |
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/** Helper template class that makes basic properties of given enumeration type visible |
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* from outsize. It is used as base class of several EnumPropsT specializations each |
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* dedicated to one of commonly used enumeration types. |
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* @param Tenum_t enumeration type that you want to describe |
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* @param Tstorage_t what storage type would be sufficient (i.e. byte) |
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* @param Tbegin first valid value from the contiguous range (i.e. TRACK_BEGIN) |
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* @param Tend one past the last valid value from the contiguous range (i.e. TRACK_END) |
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* @param Tinvalid value used as invalid value marker (i.e. INVALID_TRACK) |
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*/ |
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template <typename Tenum_t, typename Tstorage_t, Tenum_t Tbegin, Tenum_t Tend, Tenum_t Tinvalid> |
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struct MakeEnumPropsT { |
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typedef Tenum_t type; ///< enum type (i.e. Trackdir) |
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typedef Tstorage_t storage; ///< storage type (i.e. byte) |
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static const Tenum_t begin = Tbegin; ///< lowest valid value (i.e. TRACKDIR_BEGIN) |
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static const Tenum_t end = Tend; ///< one after the last valid value (i.e. TRACKDIR_END) |
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static const Tenum_t invalid = Tinvalid; ///< what value is used as invalid value (i.e. INVALID_TRACKDIR) |
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}; |
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/** In some cases we use byte or uint16 to store values that are defined as enum. It is |
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* necessary in order to control the sizeof() such values. Some compilers make enum |
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* the same size as int (4 or 8 bytes instead of 1 or 2). As a consequence the strict |
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* compiler type - checking causes errors like: |
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* 'HasPowerOnRail' : cannot convert parameter 1 from 'byte' to 'RailType' when |
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* u->u.rail.railtype is passed as argument or type RailType. In such cases it is better |
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* to teach the compiler that u->u.rail.railtype is to be treated as RailType. */ |
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template <typename Tenum_t> struct TinyEnumT; |
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/** The general declaration of TinyEnumT<> (above) */ |
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template <typename Tenum_t> |
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struct TinyEnumT |
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{ |
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typedef Tenum_t enum_type; ///< expose our enumeration type (i.e. Trackdir) to outside |
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typedef EnumPropsT<Tenum_t> Props; ///< make easier access to our enumeration propeties |
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typedef typename Props::storage storage_type; ///< small storage type |
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static const enum_type begin = Props::begin; ///< enum beginning (i.e. TRACKDIR_BEGIN) |
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static const enum_type end = Props::end; ///< enum end (i.e. TRACKDIR_END) |
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static const enum_type invalid = Props::invalid;///< invalid value (i.e. INVALID_TRACKDIR) |
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storage_type m_val; ///< here we hold the actual value in small (i.e. byte) form |
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/** Cast operator - invoked then the value is assigned to the Tenum_t type */ |
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FORCEINLINE operator enum_type () const |
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{ |
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return (enum_type)m_val; |
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} |
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|
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/** Assignment operator (from Tenum_t type) */ |
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FORCEINLINE TinyEnumT& operator = (enum_type e) |
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{ |
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m_val = (storage_type)e; return *this; |
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} |
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|
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/** postfix ++ operator on tiny type */ |
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FORCEINLINE TinyEnumT operator ++ (int) |
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{ |
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TinyEnumT org = *this; |
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if (++m_val >= end) m_val -= (storage_type)(end - begin); |
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return org; |
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} |
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|
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/** prefix ++ operator on tiny type */ |
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FORCEINLINE TinyEnumT& operator ++ () |
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{ |
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if (++m_val >= end) m_val -= (storage_type)(end - begin); |
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return *this; |
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} |
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}; |
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|
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#endif /* HELPERS_HPP */ |