csutil/metautils.h
00001 /* 00002 Copyright (C) 2007 by Marten Svanfeldt 00003 00004 This library is free software; you can redistribute it and/or 00005 modify it under the terms of the GNU Library General Public 00006 License as published by the Free Software Foundation; either 00007 version 2 of the License, or (at your option) any later version. 00008 00009 This library is distributed in the hope that it will be useful, 00010 but WITHOUT ANY WARRANTY; without even the implied warranty of 00011 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 00012 Library General Public License for more details. 00013 00014 You should have received a copy of the GNU Library General Public 00015 License along with this library; if not, write to the Free 00016 Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 00017 */ 00018 00019 00020 #ifndef __CS_CSUTIL_METAUTILS_H__ 00021 #define __CS_CSUTIL_METAUTILS_H__ 00022 00023 namespace CS 00024 { 00025 namespace Meta 00026 { 00027 namespace Implementation 00028 { 00029 00031 template<typename T> 00032 struct AlignmentOfHack 00033 { 00034 char c; 00035 T t; 00036 AlignmentOfHack(); 00037 }; 00038 00040 template<size_t A, size_t S> 00041 struct AlignmentLogic 00042 { 00043 static const unsigned int value = A < S ? A : S; 00044 }; 00045 00047 template<typename T> 00048 struct AlignmentOfImpl 00049 { 00050 static const size_t value = AlignmentLogic< 00051 sizeof(AlignmentOfHack<T>) - sizeof(T), 00052 sizeof(T)>::value; 00053 }; 00054 00055 00056 // Provide types forced aligned to certain boundaries 00057 struct Aligned1 {CS_ALIGNED_MEMBER(char c, 1);}; 00058 struct Aligned2 {CS_ALIGNED_MEMBER(char c, 2);}; 00059 struct Aligned4 {CS_ALIGNED_MEMBER(char c, 4);}; 00060 struct Aligned8 {CS_ALIGNED_MEMBER(char c, 8);}; 00061 struct Aligned16 {CS_ALIGNED_MEMBER(char c, 16);}; 00062 00063 } 00064 00068 template<typename T> 00069 struct AlignmentOf 00070 { 00071 static const unsigned int value = Implementation::AlignmentOfImpl<T>::value; 00072 }; 00073 00078 template<typename T, unsigned int Alignment> 00079 struct AlignSize 00080 { 00081 static const unsigned int value = (sizeof(T) + (Alignment - 1)) & ~(Alignment-1); 00082 }; 00083 00087 template<size_t Alignment> 00088 struct TypeWithAlignment 00089 {/* No default... */}; 00090 00091 template<> struct TypeWithAlignment<1> { typedef Implementation::Aligned1 Type; }; 00092 template<> struct TypeWithAlignment<2> { typedef Implementation::Aligned2 Type; }; 00093 template<> struct TypeWithAlignment<4> { typedef Implementation::Aligned4 Type; }; 00094 template<> struct TypeWithAlignment<8> { typedef Implementation::Aligned8 Type; }; 00095 template<> struct TypeWithAlignment<16> { typedef Implementation::Aligned16 Type; }; 00096 00100 template<size_t Size> 00101 struct TypeOfSize 00102 { /*No default...*/ }; 00103 00104 template<> struct TypeOfSize<1> { typedef uint8 Type; }; 00105 00106 template<> struct TypeOfSize<2> { typedef uint16 Type; }; 00107 00108 template<> struct TypeOfSize<3> { typedef uint32 Type; }; 00109 template<> struct TypeOfSize<4> { typedef uint32 Type; }; 00110 00111 template<> struct TypeOfSize<5> { typedef uint64 Type; }; 00112 template<> struct TypeOfSize<6> { typedef uint64 Type; }; 00113 template<> struct TypeOfSize<7> { typedef uint64 Type; }; 00114 template<> struct TypeOfSize<8> { typedef uint64 Type; }; 00115 00116 00118 template<size_t R> 00119 struct Log2 00120 { 00121 static const unsigned int RShift = R >> 1; 00122 static const unsigned int value = Log2<RShift>::value + 1; 00123 }; 00124 00125 template<> 00126 struct Log2<1> 00127 { 00128 static const unsigned int value = 0; 00129 }; 00130 00131 template<> 00132 struct Log2<0> 00133 { 00134 static const unsigned int value = 0; 00135 }; 00136 00138 template<size_t R> 00139 struct IsLog2 00140 { 00141 static const bool value = (!(R & (R - 1)) && R); 00142 }; 00143 00145 template<typename T> 00146 struct EBOptHelper : public T 00147 {}; 00148 00149 template<> 00150 struct EBOptHelper<void> 00151 {}; 00152 } 00153 } 00154 00155 #endif
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