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authorrubidium <rubidium@openttd.org>2007-12-18 19:52:14 +0000
committerrubidium <rubidium@openttd.org>2007-12-18 19:52:14 +0000
commit09951941629e758484d51c39ebd87e3632b19565 (patch)
treee33a532cbac926cf6b9b10a29cc5453106de819d /src/core
parent962f6361ff8d4827c18ca2f8bfc130170d3837bd (diff)
downloadopenttd-09951941629e758484d51c39ebd87e3632b19565.tar.xz
(svn r11661) -Codechange: some header reworks in order to try to reduce the compile time of OpenTTD by reduce the amount of circular-ish dependencies.
Diffstat (limited to 'src/core')
-rw-r--r--src/core/enum_type.hpp115
1 files changed, 115 insertions, 0 deletions
diff --git a/src/core/enum_type.hpp b/src/core/enum_type.hpp
new file mode 100644
index 000000000..725d3985f
--- /dev/null
+++ b/src/core/enum_type.hpp
@@ -0,0 +1,115 @@
+/* $Id$ */
+
+/** @file enum_type.hpp Type (helpers) for enums */
+
+#ifndef ENUM_TYPE_HPP
+#define ENUM_TYPE_HPP
+
+/** Some enums need to have allowed incrementing (i.e. StationClassID) */
+#define DECLARE_POSTFIX_INCREMENT(type) \
+ FORCEINLINE type operator ++(type& e, int) \
+ { \
+ type e_org = e; \
+ e = (type)((int)e + 1); \
+ return e_org; \
+ } \
+ FORCEINLINE type operator --(type& e, int) \
+ { \
+ type e_org = e; \
+ e = (type)((int)e - 1); \
+ return e_org; \
+ }
+
+
+
+/** Operators to allow to work with enum as with type safe bit set in C++ */
+# define DECLARE_ENUM_AS_BIT_SET(mask_t) \
+ FORCEINLINE mask_t operator | (mask_t m1, mask_t m2) {return (mask_t)((int)m1 | m2);} \
+ FORCEINLINE mask_t operator & (mask_t m1, mask_t m2) {return (mask_t)((int)m1 & m2);} \
+ FORCEINLINE mask_t operator ^ (mask_t m1, mask_t m2) {return (mask_t)((int)m1 ^ m2);} \
+ FORCEINLINE mask_t& operator |= (mask_t& m1, mask_t m2) {m1 = m1 | m2; return m1;} \
+ FORCEINLINE mask_t& operator &= (mask_t& m1, mask_t m2) {m1 = m1 & m2; return m1;} \
+ FORCEINLINE mask_t& operator ^= (mask_t& m1, mask_t m2) {m1 = m1 ^ m2; return m1;} \
+ FORCEINLINE mask_t operator ~(mask_t m) {return (mask_t)(~(int)m);}
+
+
+/** Informative template class exposing basic enumeration properties used by several
+ * other templates below. Here we have only forward declaration. For each enum type
+ * we will create specialization derived from MakeEnumPropsT<>.
+ * i.e.:
+ * template <> struct EnumPropsT<Track> : MakeEnumPropsT<Track, byte, TRACK_BEGIN, TRACK_END, INVALID_TRACK> {};
+ * followed by:
+ * typedef TinyEnumT<Track> TrackByte;
+ */
+template <typename Tenum_t> struct EnumPropsT;
+
+/** Helper template class that makes basic properties of given enumeration type visible
+ * from outsize. It is used as base class of several EnumPropsT specializations each
+ * dedicated to one of commonly used enumeration types.
+ * @param Tenum_t enumeration type that you want to describe
+ * @param Tstorage_t what storage type would be sufficient (i.e. byte)
+ * @param Tbegin first valid value from the contiguous range (i.e. TRACK_BEGIN)
+ * @param Tend one past the last valid value from the contiguous range (i.e. TRACK_END)
+ * @param Tinvalid value used as invalid value marker (i.e. INVALID_TRACK)
+ */
+template <typename Tenum_t, typename Tstorage_t, Tenum_t Tbegin, Tenum_t Tend, Tenum_t Tinvalid>
+struct MakeEnumPropsT {
+ typedef Tenum_t type; ///< enum type (i.e. Trackdir)
+ typedef Tstorage_t storage; ///< storage type (i.e. byte)
+ static const Tenum_t begin = Tbegin; ///< lowest valid value (i.e. TRACKDIR_BEGIN)
+ static const Tenum_t end = Tend; ///< one after the last valid value (i.e. TRACKDIR_END)
+ static const Tenum_t invalid = Tinvalid; ///< what value is used as invalid value (i.e. INVALID_TRACKDIR)
+};
+
+
+
+/** In some cases we use byte or uint16 to store values that are defined as enum. It is
+ * necessary in order to control the sizeof() such values. Some compilers make enum
+ * the same size as int (4 or 8 bytes instead of 1 or 2). As a consequence the strict
+ * compiler type-checking causes errors like:
+ * 'HasPowerOnRail' : cannot convert parameter 1 from 'byte' to 'RailType' when
+ * u->u.rail.railtype is passed as argument or type RailType. In such cases it is better
+ * to teach the compiler that u->u.rail.railtype is to be treated as RailType. */
+template <typename Tenum_t> struct TinyEnumT;
+
+/** The general declaration of TinyEnumT<> (above) */
+template <typename Tenum_t> struct TinyEnumT
+{
+ typedef Tenum_t enum_type; ///< expose our enumeration type (i.e. Trackdir) to outside
+ typedef EnumPropsT<Tenum_t> Props; ///< make easier access to our enumeration propeties
+ typedef typename Props::storage storage_type; ///< small storage type
+ static const enum_type begin = Props::begin; ///< enum beginning (i.e. TRACKDIR_BEGIN)
+ static const enum_type end = Props::end; ///< enum end (i.e. TRACKDIR_END)
+ static const enum_type invalid = Props::invalid;///< invalid value (i.e. INVALID_TRACKDIR)
+
+ storage_type m_val; ///< here we hold the actual value in small (i.e. byte) form
+
+ /** Cast operator - invoked then the value is assigned to the Tenum_t type */
+ FORCEINLINE operator enum_type () const
+ {
+ return (enum_type)m_val;
+ }
+
+ /** Assignment operator (from Tenum_t type) */
+ FORCEINLINE TinyEnumT& operator = (enum_type e)
+ {
+ m_val = (storage_type)e; return *this;
+ }
+
+ /** postfix ++ operator on tiny type */
+ FORCEINLINE TinyEnumT operator ++ (int)
+ {
+ TinyEnumT org = *this;
+ if (++m_val >= end) m_val -= (storage_type)(end - begin);
+ return org;
+ }
+
+ /** prefix ++ operator on tiny type */
+ FORCEINLINE TinyEnumT& operator ++ ()
+ {
+ if (++m_val >= end) m_val -= (storage_type)(end - begin);
+ return *this;
+ }
+};
+
+#endif /* HELPERS_HPP */