author | KUDr |
Sat, 13 Jan 2007 16:23:24 +0000 | |
changeset 5645 | ee435eb9a180 |
parent 5633 | e1905dacc378 |
child 6481 | 85ad87daf4b0 |
permissions | -rw-r--r-- |
5633
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/* $Id$ */ |
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#ifndef BLOB_HPP |
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#define BLOB_HPP |
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/** Type-safe version of memcpy(). |
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* @param d destination buffer |
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* @param s source buffer |
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* @param num_items number of items to be copied (!not number of bytes!) */ |
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template <class Titem_> |
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FORCEINLINE void MemCpyT(Titem_* d, const Titem_* s, int num_items = 1) |
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{ |
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memcpy(d, s, num_items * sizeof(Titem_)); |
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} |
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/** Base class for simple binary blobs. |
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* Item is byte. |
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* The word 'simple' means: |
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* - no configurable allocator type (always made from heap) |
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* - no smart deallocation - deallocation must be called from the same |
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* module (DLL) where the blob was allocated |
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* - no configurable allocation policy (how big blocks should be allocated) |
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* - no extra ownership policy (i.e. 'copy on write') when blob is copied |
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* - no thread synchronization at all |
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* |
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* Internal member layout: |
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* 1. The only class member is pointer to the first item (see union ptr_u). |
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* 2. Allocated block contains the blob header (see CHdr) followed by the raw byte data. |
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* Always, when it allocates memory the allocated size is: |
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* sizeof(CHdr) + <data capacity> |
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* 3. Two 'virtual' members (m_size and m_max_size) are stored in the CHdr at beginning |
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* of the alloated block. |
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* 4. The pointer (in ptr_u) points behind the header (to the first data byte). |
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* When memory block is allocated, the sizeof(CHdr) it added to it. |
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* 5. Benefits of this layout: |
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* - items are accessed in the simplest possible way - just dereferencing the pointer, |
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* which is good for performance (assuming that data are accessed most often). |
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* - sizeof(blob) is the same as the size of any other pointer |
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* 6. Drawbacks of this layout: |
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* - the fact, that pointer to the alocated block is adjusted by sizeof(CHdr) before |
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* it is stored can lead to several confusions: |
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* - it is not common pattern so the implementation code is bit harder to read |
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* - valgrind can generate warning that allocated block is lost (not accessible) |
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* */ |
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class CBlobBaseSimple { |
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protected: |
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/** header of the allocated memory block */ |
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struct CHdr { |
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int m_size; ///< actual blob size in bytes |
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int m_max_size; ///< maximum (allocated) size in bytes |
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}; |
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/** type used as class member */ |
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union { |
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int8 *m_pData; ///< pointer to the first byte of data |
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CHdr *m_pHdr_1; ///< pointer just after the CHdr holding m_size and m_max_size |
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} ptr_u; |
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public: |
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static const int Ttail_reserve = 4; ///< four extra bytes will be always allocated and zeroed at the end |
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|
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/** default constructor - initializes empty blob */ |
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FORCEINLINE CBlobBaseSimple() { InitEmpty(); } |
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/** copy constructor */ |
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FORCEINLINE CBlobBaseSimple(const CBlobBaseSimple& src) |
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{ |
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InitEmpty(); |
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AppendRaw(src); |
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} |
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/** destructor */ |
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FORCEINLINE ~CBlobBaseSimple() { Free(); } |
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protected: |
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/** initialize the empty blob by setting the ptr_u.m_pHdr_1 pointer to the static CHdr with |
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* both m_size and m_max_size containing zero */ |
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FORCEINLINE void InitEmpty() { static CHdr hdrEmpty[] = {{0, 0}, {0, 0}}; ptr_u.m_pHdr_1 = &hdrEmpty[1]; } |
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/** initialize blob by attaching it to the given header followed by data */ |
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FORCEINLINE void Init(CHdr* hdr) { ptr_u.m_pHdr_1 = &hdr[1]; } |
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/** blob header accessor - use it rather than using the pointer arithmetics directly - non-const version */ |
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FORCEINLINE CHdr& Hdr() { return ptr_u.m_pHdr_1[-1]; } |
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/** blob header accessor - use it rather than using the pointer arithmetics directly - const version */ |
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FORCEINLINE const CHdr& Hdr() const { return ptr_u.m_pHdr_1[-1]; } |
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/** return reference to the actual blob size - used when the size needs to be modified */ |
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84 |
FORCEINLINE int& RawSizeRef() { return Hdr().m_size; }; |
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85 |
|
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86 |
public: |
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87 |
/** return true if blob doesn't contain valid data */ |
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88 |
FORCEINLINE bool IsEmpty() const { return RawSize() == 0; } |
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89 |
/** return the number of valid data bytes in the blob */ |
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90 |
FORCEINLINE int RawSize() const { return Hdr().m_size; }; |
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91 |
/** return the current blob capacity in bytes */ |
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92 |
FORCEINLINE int MaxRawSize() const { return Hdr().m_max_size; }; |
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93 |
/** return pointer to the first byte of data - non-const version */ |
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94 |
FORCEINLINE int8* RawData() { return ptr_u.m_pData; } |
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95 |
/** return pointer to the first byte of data - const version */ |
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96 |
FORCEINLINE const int8* RawData() const { return ptr_u.m_pData; } |
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97 |
#if 0 // reenable when needed |
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98 |
/** return the 32 bit CRC of valid data in the blob */ |
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99 |
FORCEINLINE uint32 Crc32() const {return CCrc32::Calc(RawData(), RawSize());} |
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100 |
#endif //0 |
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101 |
/** invalidate blob's data - doesn't free buffer */ |
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102 |
FORCEINLINE void Clear() { RawSizeRef() = 0; } |
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103 |
/** free the blob's memory */ |
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104 |
FORCEINLINE void Free() { if (MaxRawSize() > 0) {RawFree(&Hdr()); InitEmpty();} } |
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105 |
/** copy data from another blob - replaces any existing blob's data */ |
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106 |
FORCEINLINE void CopyFrom(const CBlobBaseSimple& src) { Clear(); AppendRaw(src); } |
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107 |
/** overtake ownership of data buffer from the source blob - source blob will become empty */ |
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108 |
FORCEINLINE void MoveFrom(CBlobBaseSimple& src) { Free(); ptr_u.m_pData = src.ptr_u.m_pData; src.InitEmpty(); } |
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109 |
/** swap buffers (with data) between two blobs (this and source blob) */ |
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110 |
FORCEINLINE void Swap(CBlobBaseSimple& src) { int8 *tmp = ptr_u.m_pData; ptr_u.m_pData = src.ptr_u.m_pData; src.ptr_u.m_pData = tmp; } |
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111 |
|
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112 |
/** append new bytes at the end of existing data bytes - reallocates if necessary */ |
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113 |
FORCEINLINE void AppendRaw(int8 *p, int num_bytes) |
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114 |
{ |
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115 |
assert(p != NULL); |
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116 |
if (num_bytes > 0) { |
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117 |
memcpy(GrowRawSize(num_bytes), p, num_bytes); |
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118 |
} else { |
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119 |
assert(num_bytes >= 0); |
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120 |
} |
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121 |
} |
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122 |
|
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123 |
/** append bytes from given source blob to the end of existing data bytes - reallocates if necessary */ |
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124 |
FORCEINLINE void AppendRaw(const CBlobBaseSimple& src) |
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125 |
{ |
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126 |
if (!src.IsEmpty()) |
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127 |
memcpy(GrowRawSize(src.RawSize()), src.RawData(), src.RawSize()); |
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128 |
} |
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129 |
|
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130 |
/** Reallocate if there is no free space for num_bytes bytes. |
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131 |
* @return pointer to the new data to be added */ |
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132 |
FORCEINLINE int8* MakeRawFreeSpace(int num_bytes) |
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133 |
{ |
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134 |
assert(num_bytes >= 0); |
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135 |
int new_size = RawSize() + num_bytes; |
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136 |
if (new_size > MaxRawSize()) SmartAlloc(new_size); |
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137 |
FixTail(); |
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138 |
return ptr_u.m_pData + RawSize(); |
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139 |
} |
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140 |
|
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141 |
/** Increase RawSize() by num_bytes. |
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142 |
* @return pointer to the new data added */ |
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143 |
FORCEINLINE int8* GrowRawSize(int num_bytes) |
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144 |
{ |
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145 |
int8* pNewData = MakeRawFreeSpace(num_bytes); |
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146 |
RawSizeRef() += num_bytes; |
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147 |
return pNewData; |
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148 |
} |
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149 |
|
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150 |
/** Decrease RawSize() by num_bytes. */ |
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151 |
FORCEINLINE void ReduceRawSize(int num_bytes) |
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152 |
{ |
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153 |
if (MaxRawSize() > 0 && num_bytes > 0) { |
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154 |
assert(num_bytes <= RawSize()); |
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155 |
if (num_bytes < RawSize()) RawSizeRef() -= num_bytes; |
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156 |
else RawSizeRef() = 0; |
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157 |
} |
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158 |
} |
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159 |
/** reallocate blob data if needed */ |
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160 |
void SmartAlloc(int new_size) |
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161 |
{ |
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162 |
int old_max_size = MaxRawSize(); |
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163 |
if (old_max_size >= new_size) return; |
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164 |
// calculate minimum block size we need to allocate |
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165 |
int min_alloc_size = sizeof(CHdr) + new_size + Ttail_reserve; |
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166 |
// ask allocation policy for some reasonable block size |
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int alloc_size = AllocPolicy(min_alloc_size); |
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// allocate new block |
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CHdr* pNewHdr = RawAlloc(alloc_size); |
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// setup header |
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pNewHdr->m_size = RawSize(); |
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pNewHdr->m_max_size = alloc_size - (sizeof(CHdr) + Ttail_reserve); |
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// copy existing data |
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if (RawSize() > 0) |
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memcpy(pNewHdr + 1, ptr_u.m_pData, pNewHdr->m_size); |
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// replace our block with new one |
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CHdr* pOldHdr = &Hdr(); |
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Init(pNewHdr); |
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if (old_max_size > 0) |
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RawFree(pOldHdr); |
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} |
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/** simple allocation policy - can be optimized later */ |
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FORCEINLINE static int AllocPolicy(int min_alloc) |
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{ |
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if (min_alloc < (1 << 9)) { |
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if (min_alloc < (1 << 5)) return (1 << 5); |
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return (min_alloc < (1 << 7)) ? (1 << 7) : (1 << 9); |
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} |
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if (min_alloc < (1 << 15)) { |
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if (min_alloc < (1 << 11)) return (1 << 11); |
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return (min_alloc < (1 << 13)) ? (1 << 13) : (1 << 15); |
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} |
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if (min_alloc < (1 << 20)) { |
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if (min_alloc < (1 << 17)) return (1 << 17); |
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return (min_alloc < (1 << 19)) ? (1 << 19) : (1 << 20); |
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} |
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min_alloc = (min_alloc | ((1 << 20) - 1)) + 1; |
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return min_alloc; |
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} |
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200 |
|
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/** all allocation should happen here */ |
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static FORCEINLINE CHdr* RawAlloc(int num_bytes) { return (CHdr*)malloc(num_bytes); } |
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/** all deallocations should happen here */ |
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static FORCEINLINE void RawFree(CHdr* p) { free(p); } |
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/** fixing the four bytes at the end of blob data - useful when blob is used to hold string */ |
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FORCEINLINE void FixTail() |
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{ |
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if (MaxRawSize() > 0) { |
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int8 *p = &ptr_u.m_pData[RawSize()]; |
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for (int i = 0; i < Ttail_reserve; i++) p[i] = 0; |
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} |
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212 |
} |
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213 |
}; |
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214 |
|
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/** Blob - simple dynamic Titem_ array. Titem_ (template argument) is a placeholder for any type. |
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* Titem_ can be any integral type, pointer, or structure. Using Blob instead of just plain C array |
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* simplifies the resource management in several ways: |
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* 1. When adding new item(s) it automatically grows capacity if needed. |
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* 2. When variable of type Blob comes out of scope it automatically frees the data buffer. |
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* 3. Takes care about the actual data size (number of used items). |
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* 4. Dynamically constructs only used items (as opposite of static array which constructs all items) */ |
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template <class Titem_, class Tbase_ = CBlobBaseSimple> |
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class CBlobT : public CBlobBaseSimple { |
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// make template arguments public: |
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225 |
public: |
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typedef Titem_ Titem; |
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typedef Tbase_ Tbase; |
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228 |
|
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static const int Titem_size = sizeof(Titem); |
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230 |
|
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/** Default constructor - makes new Blob ready to accept any data */ |
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232 |
FORCEINLINE CBlobT() : Tbase() {} |
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/** Copy constructor - make new blob to become copy of the original (source) blob */ |
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FORCEINLINE CBlobT(const Tbase& src) : Tbase(src) {assert((RawSize() % Titem_size) == 0);} |
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/** Destructor - ensures that allocated memory (if any) is freed */ |
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FORCEINLINE ~CBlobT() { Free(); } |
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/** Check the validity of item index (only in debug mode) */ |
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238 |
FORCEINLINE void CheckIdx(int idx) { assert(idx >= 0); assert(idx < Size()); } |
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/** Return pointer to the first data item - non-const version */ |
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240 |
FORCEINLINE Titem* Data() { return (Titem*)RawData(); } |
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/** Return pointer to the first data item - const version */ |
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FORCEINLINE const Titem* Data() const { return (const Titem*)RawData(); } |
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243 |
/** Return pointer to the idx-th data item - non-const version */ |
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FORCEINLINE Titem* Data(int idx) { CheckIdx(idx); return (Data() + idx); } |
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/** Return pointer to the idx-th data item - const version */ |
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FORCEINLINE const Titem* Data(int idx) const { CheckIdx(idx); return (Data() + idx); } |
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/** Return number of items in the Blob */ |
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FORCEINLINE int Size() const { return (RawSize() / Titem_size); } |
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249 |
/** Free the memory occupied by Blob destroying all items */ |
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FORCEINLINE void Free() |
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{ |
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assert((RawSize() % Titem_size) == 0); |
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int old_size = Size(); |
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if (old_size > 0) { |
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// destroy removed items; |
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Titem* pI_last_to_destroy = Data(0); |
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for (Titem* pI = Data(old_size - 1); pI >= pI_last_to_destroy; pI--) pI->~Titem_(); |
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} |
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Tbase::Free(); |
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} |
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/** Grow number of data items in Blob by given number - doesn't construct items */ |
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FORCEINLINE Titem* GrowSizeNC(int num_items) { return (Titem*)GrowRawSize(num_items * Titem_size); } |
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/** Grow number of data items in Blob by given number - constructs new items (using Titem_'s default constructor) */ |
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FORCEINLINE Titem* GrowSizeC(int num_items) |
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{ |
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Titem* pI = GrowSizeNC(num_items); |
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for (int i = num_items; i > 0; i--, pI++) new (pI) Titem(); |
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} |
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/** Destroy given number of items and reduce the Blob's data size */ |
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FORCEINLINE void ReduceSize(int num_items) |
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{ |
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assert((RawSize() % Titem_size) == 0); |
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int old_size = Size(); |
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assert(num_items <= old_size); |
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int new_size = (num_items <= old_size) ? (old_size - num_items) : 0; |
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// destroy removed items; |
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Titem* pI_last_to_destroy = Data(new_size); |
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for (Titem* pI = Data(old_size - 1); pI >= pI_last_to_destroy; pI--) pI->~Titem(); |
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// remove them |
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ReduceRawSize(num_items * Titem_size); |
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} |
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/** Append one data item at the end (calls Titem_'s default constructor) */ |
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FORCEINLINE Titem* AppendNew() |
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{ |
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Titem& dst = *GrowSizeNC(1); // Grow size by one item |
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Titem* pNewItem = new (&dst) Titem(); // construct the new item by calling in-place new operator |
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return pNewItem; |
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} |
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/** Append the copy of given item at the end of Blob (using copy constructor) */ |
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FORCEINLINE Titem* Append(const Titem& src) |
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{ |
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Titem& dst = *GrowSizeNC(1); // Grow size by one item |
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Titem* pNewItem = new (&dst) Titem(src); // construct the new item by calling in-place new operator with copy ctor() |
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return pNewItem; |
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} |
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/** Add given items (ptr + number of items) at the end of blob */ |
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FORCEINLINE Titem* Append(const Titem* pSrc, int num_items) |
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{ |
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Titem* pDst = GrowSizeNC(num_items); |
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Titem* pDstOrg = pDst; |
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Titem* pDstEnd = pDst + num_items; |
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while (pDst < pDstEnd) new (pDst++) Titem(*(pSrc++)); |
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return pDstOrg; |
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} |
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/** Remove item with the given index by replacing it by the last item and reducing the size by one */ |
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FORCEINLINE void RemoveBySwap(int idx) |
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{ |
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CheckIdx(idx); |
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// destroy removed item |
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Titem* pRemoved = Data(idx); |
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RemoveBySwap(pRemoved); |
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} |
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/** Remove item given by pointer replacing it by the last item and reducing the size by one */ |
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FORCEINLINE void RemoveBySwap(Titem* pItem) |
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315 |
{ |
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Titem* pLast = Data(Size() - 1); |
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assert(pItem >= Data() && pItem <= pLast); |
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// move last item to its new place |
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if (pItem != pLast) { |
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pItem->~Titem_(); |
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new (pItem) Titem_(*pLast); |
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} |
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// destroy the last item |
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pLast->~Titem_(); |
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// and reduce the raw blob size |
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ReduceRawSize(Titem_size); |
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327 |
} |
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/** Ensures that given number of items can be added to the end of Blob. Returns pointer to the |
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* first free (unused) item */ |
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FORCEINLINE Titem* MakeFreeSpace(int num_items) { return (Titem*)MakeRawFreeSpace(num_items * Titem_size); } |
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}; |
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332 |
|
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// simple string implementation |
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(svn r8092) -Codechange: header files with miscellaneous template classes (smart pointers, blob, array, hashtable, etc.) moved from src/yapf to src/misc as they can now be used anywhere.
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334 |
struct CStrA : public CBlobT<char> |
e1905dacc378
(svn r8092) -Codechange: header files with miscellaneous template classes (smart pointers, blob, array, hashtable, etc.) moved from src/yapf to src/misc as they can now be used anywhere.
KUDr
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335 |
{ |
e1905dacc378
(svn r8092) -Codechange: header files with miscellaneous template classes (smart pointers, blob, array, hashtable, etc.) moved from src/yapf to src/misc as they can now be used anywhere.
KUDr
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336 |
typedef CBlobT<char> base; |
e1905dacc378
(svn r8092) -Codechange: header files with miscellaneous template classes (smart pointers, blob, array, hashtable, etc.) moved from src/yapf to src/misc as they can now be used anywhere.
KUDr
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337 |
CStrA(const char* str = NULL) {Append(str);} |
e1905dacc378
(svn r8092) -Codechange: header files with miscellaneous template classes (smart pointers, blob, array, hashtable, etc.) moved from src/yapf to src/misc as they can now be used anywhere.
KUDr
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338 |
FORCEINLINE CStrA(const CBlobBaseSimple& src) : base(src) {} |
e1905dacc378
(svn r8092) -Codechange: header files with miscellaneous template classes (smart pointers, blob, array, hashtable, etc.) moved from src/yapf to src/misc as they can now be used anywhere.
KUDr
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339 |
void Append(const char* str) {if (str != NULL && str[0] != '\0') base::Append(str, (int)strlen(str));} |
e1905dacc378
(svn r8092) -Codechange: header files with miscellaneous template classes (smart pointers, blob, array, hashtable, etc.) moved from src/yapf to src/misc as they can now be used anywhere.
KUDr
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340 |
}; |
e1905dacc378
(svn r8092) -Codechange: header files with miscellaneous template classes (smart pointers, blob, array, hashtable, etc.) moved from src/yapf to src/misc as they can now be used anywhere.
KUDr
parents:
diff
changeset
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341 |
|
e1905dacc378
(svn r8092) -Codechange: header files with miscellaneous template classes (smart pointers, blob, array, hashtable, etc.) moved from src/yapf to src/misc as they can now be used anywhere.
KUDr
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342 |
#endif /* BLOB_HPP */ |