Chris Danford
100 lines
3.0 KiB
C++
100 lines
3.0 KiB
C++
#ifndef EnumHelper_H
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#define EnumHelper_H
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/*
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* Safely add an integer to an enum.
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*
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* This is illegal:
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*
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* ((int&)val) += iAmt;
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*
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* It breaks aliasing rules; the compiler is allowed to assume that "val" doesn't
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* change (unless it's declared volatile), and in some cases, you'll end up getting
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* old values for "val" following the add. (What's probably really happening is
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* that the memory location is being added to, but the value is stored in a register,
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* and breaking aliasing rules means the compiler doesn't know that the register
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* value is invalid.)
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*
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* Always do these conversions through a union.
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*/
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template<typename T>
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static inline void enum_add( T &val, int iAmt )
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{
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union conv
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{
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T value;
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int i;
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};
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conv c;
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c.value = val;
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c.i += iAmt;
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val = c.value;
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}
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#define FOREACH_ENUM( e, max, var ) for( e var=(e)0; var<max; enum_add<e>( var, +1 ) )
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static const CString EMPTY_STRING;
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#define XToString(X, CNT) \
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const CString& X##ToString( X x ) \
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{ \
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if( x == ARRAYSIZE(X##Names)+1 ) \
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return EMPTY_STRING; \
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ASSERT(unsigned(x) < CNT); \
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return X##Names[x]; \
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}
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#define XToThemedString(X, CNT) \
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static ThemeMetric<CString> g_##X##Name[CNT]; \
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const CString &X##ToThemedString( X x ) \
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{ \
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static bool bInitted = false; \
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if( !bInitted ) { \
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bInitted = true; \
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for( unsigned i = 0; i < CNT; ++i ) \
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g_##X##Name[i].Load( #X, X##ToString((X)i) ); \
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} \
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return g_##X##Name[x]; \
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}
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#define StringToX(X) \
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X StringTo##X( const CString& s ) \
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{ \
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CString s2 = s; \
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s2.MakeLower(); \
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unsigned i; \
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for( i = 0; i < ARRAYSIZE(X##Names); ++i ) \
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if( !s2.CompareNoCase(X##Names[i]) ) \
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return (X)i; \
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return (X)(i+1); /*invalid*/ \
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}
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#endif
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/*
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* (c) 2004 Chris Danford
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* All rights reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, and/or sell copies of the Software, and to permit persons to
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* whom the Software is furnished to do so, provided that the above
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* copyright notice(s) and this permission notice appear in all copies of
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* the Software and that both the above copyright notice(s) and this
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* permission notice appear in supporting documentation.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF
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* THIRD PARTY RIGHTS. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR HOLDERS
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* INCLUDED IN THIS NOTICE BE LIABLE FOR ANY CLAIM, OR ANY SPECIAL INDIRECT
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* OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
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* OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR
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* OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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* PERFORMANCE OF THIS SOFTWARE.
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*/
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