author | KUDr |
Mon, 01 Jan 2007 19:44:02 +0000 | |
branch | custombridgeheads |
changeset 5626 | 1811beeb472f |
parent 5621 | 6ce400c0a2f4 |
permissions | -rw-r--r-- |
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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, size_t 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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|
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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 pointter (in ptr_u) posize_ts 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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public: |
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typedef ::ptrdiff_t size_t; |
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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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size_t m_size; ///< actual blob size in bytes |
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size_t 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; ///< ptr to the first byte of data |
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wchar_t *m_pwData; ///< ptr to the first byte of data |
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CHdr *m_pHdr_1; ///< ptr 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 size_t 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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/** constructor - create blob with data */ |
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FORCEINLINE CBlobBaseSimple(const int8 *p, size_t num_bytes) { InitEmpty(); AppendRaw(p, num_bytes);} |
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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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/** move constructor - take ownership of blob data */ |
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FORCEINLINE CBlobBaseSimple(CHdr * const & pHdr_1) {assert(pHdr_1 != NULL); ptr_u.m_pHdr_1 = pHdr_1; *(CHdr**)&pHdr_1 = NULL;} |
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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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FORCEINLINE size_t& RawSizeRef() { return Hdr().m_size; }; |
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public: |
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/** return true if blob doesn't contain valid data */ |
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FORCEINLINE bool IsEmpty() const { return RawSize() == 0; } |
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/** return the number of valid data bytes in the blob */ |
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FORCEINLINE size_t RawSize() const { return Hdr().m_size; }; |
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/** return the current blob capacity in bytes */ |
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99 |
FORCEINLINE size_t MaxRawSize() const { return Hdr().m_max_size; }; |
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100 |
/** return pointer to the first byte of data - non-const version */ |
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101 |
FORCEINLINE int8* RawData() { return ptr_u.m_pData; } |
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102 |
/** return pointer to the first byte of data - const version */ |
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103 |
FORCEINLINE const int8* RawData() const { return ptr_u.m_pData; } |
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104 |
#if 0 // reenable when needed |
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105 |
/** return the 32 bit CRC of valid data in the blob */ |
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106 |
FORCEINLINE usize_t32 Crc32() const {return CCrc32::Calc(RawData(), RawSize());} |
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107 |
#endif //0 |
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108 |
/** invalidate blob's data - doesn't free buffer */ |
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109 |
FORCEINLINE void Clear() { RawSizeRef() = 0; } |
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110 |
/** free the blob's memory */ |
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111 |
FORCEINLINE void Free() { if (MaxRawSize() > 0) {RawFree(&Hdr()); InitEmpty();} } |
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112 |
/** copy data from another blob - replaces any existing blob's data */ |
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|
113 |
FORCEINLINE void CopyFrom(const CBlobBaseSimple& src) { Clear(); AppendRaw(src); } |
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114 |
/** overtake ownership of data buffer from the source blob - source blob will become empty */ |
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|
115 |
FORCEINLINE void MoveFrom(CBlobBaseSimple& src) { Free(); ptr_u.m_pData = src.ptr_u.m_pData; src.InitEmpty(); } |
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116 |
/** swap buffers (with data) between two blobs (this and source blob) */ |
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117 |
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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118 |
|
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119 |
/** append new bytes at the end of existing data bytes - reallocates if necessary */ |
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120 |
FORCEINLINE void AppendRaw(const int8 *p, size_t num_bytes) |
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121 |
{ |
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122 |
assert(p != NULL); |
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|
123 |
if (num_bytes > 0) { |
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124 |
memcpy(GrowRawSize(num_bytes), p, num_bytes); |
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125 |
} else { |
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126 |
assert(num_bytes >= 0); |
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127 |
} |
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128 |
} |
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129 |
|
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130 |
/** append bytes from given source blob to the end of existing data bytes - reallocates if necessary */ |
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131 |
FORCEINLINE void AppendRaw(const CBlobBaseSimple& src) |
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132 |
{ |
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133 |
if (!src.IsEmpty()) |
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|
134 |
memcpy(GrowRawSize(src.RawSize()), src.RawData(), src.RawSize()); |
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135 |
} |
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136 |
|
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137 |
/** Reallocate if there is no free space for num_bytes bytes. |
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138 |
* @return pointer to the new data to be added */ |
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139 |
FORCEINLINE int8* MakeRawFreeSpace(size_t num_bytes) |
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140 |
{ |
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141 |
assert(num_bytes >= 0); |
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142 |
size_t new_size = RawSize() + num_bytes; |
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143 |
if (new_size > MaxRawSize()) SmartAlloc(new_size); |
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144 |
return ptr_u.m_pData + RawSize(); |
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145 |
} |
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146 |
|
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147 |
/** Increase RawSize() by num_bytes. |
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148 |
* @return pointer to the new data added */ |
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149 |
FORCEINLINE int8* GrowRawSize(size_t num_bytes) |
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150 |
{ |
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151 |
int8* pNewData = MakeRawFreeSpace(num_bytes); |
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152 |
RawSizeRef() += num_bytes; |
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153 |
return pNewData; |
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154 |
} |
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155 |
|
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156 |
/** Decrease RawSize() by num_bytes. */ |
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157 |
FORCEINLINE void ReduceRawSize(size_t num_bytes) |
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158 |
{ |
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|
159 |
if (MaxRawSize() > 0 && num_bytes > 0) { |
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|
160 |
assert(num_bytes <= RawSize()); |
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|
161 |
if (num_bytes < RawSize()) RawSizeRef() -= num_bytes; |
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|
162 |
else RawSizeRef() = 0; |
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|
163 |
} |
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164 |
} |
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|
165 |
/** reallocate blob data if needed */ |
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166 |
void SmartAlloc(size_t new_size) |
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167 |
{ |
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168 |
size_t old_max_size = MaxRawSize(); |
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|
169 |
if (old_max_size >= new_size) return; |
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|
170 |
// calculate minimum block size we need to allocate |
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|
171 |
size_t min_alloc_size = sizeof(CHdr) + new_size + Ttail_reserve; |
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|
172 |
// ask allocation policy for some reasonable block size |
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|
173 |
size_t alloc_size = AllocPolicy(min_alloc_size); |
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|
174 |
// allocate new block |
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175 |
CHdr* pNewHdr = RawAlloc(alloc_size); |
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|
176 |
// setup header |
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|
177 |
pNewHdr->m_size = RawSize(); |
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|
178 |
pNewHdr->m_max_size = alloc_size - (sizeof(CHdr) + Ttail_reserve); |
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|
179 |
// copy existing data |
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|
180 |
if (RawSize() > 0) |
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|
181 |
memcpy(pNewHdr + 1, ptr_u.m_pData, pNewHdr->m_size); |
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|
182 |
// replace our block with new one |
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|
183 |
CHdr* pOldHdr = &Hdr(); |
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|
184 |
Init(pNewHdr); |
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|
185 |
if (old_max_size > 0) |
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|
186 |
RawFree(pOldHdr); |
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187 |
} |
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|
188 |
/** simple allocation policy - can be optimized later */ |
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189 |
FORCEINLINE static size_t AllocPolicy(size_t min_alloc) |
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190 |
{ |
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|
191 |
if (min_alloc < (1 << 9)) { |
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|
192 |
if (min_alloc < (1 << 5)) return (1 << 5); |
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|
193 |
return (min_alloc < (1 << 7)) ? (1 << 7) : (1 << 9); |
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194 |
} |
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|
195 |
if (min_alloc < (1 << 15)) { |
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|
196 |
if (min_alloc < (1 << 11)) return (1 << 11); |
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|
197 |
return (min_alloc < (1 << 13)) ? (1 << 13) : (1 << 15); |
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198 |
} |
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|
199 |
if (min_alloc < (1 << 20)) { |
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|
200 |
if (min_alloc < (1 << 17)) return (1 << 17); |
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201 |
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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|
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/** all allocation should happen here */ |
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static FORCEINLINE CHdr* RawAlloc(size_t 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() const |
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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 (size_t i = 0; i < Ttail_reserve; i++) p[i] = 0; |
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} |
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} |
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}; |
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|
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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 Tbase_ { |
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// make template arguments public: |
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public: |
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typedef Titem_ Titem; |
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typedef Tbase_ Tbase; |
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typedef typename Tbase::size_t size_t; |
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|
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static const size_t Titem_size = sizeof(Titem); |
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|
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struct OnTransfer { |
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typename Tbase_::CHdr *m_pHdr_1; |
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OnTransfer(const OnTransfer& src) : m_pHdr_1(src.m_pHdr_1) {assert(src.m_pHdr_1 != NULL); *(typename Tbase_::CHdr**)&src.m_pHdr_1 = NULL;} |
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OnTransfer(CBlobT& src) : m_pHdr_1(src.ptr_u.m_pHdr_1) {src.InitEmpty();} |
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~OnTransfer() {assert(m_pHdr_1 == NULL);} |
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}; |
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244 |
|
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/** Default constructor - makes new Blob ready to accept any data */ |
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FORCEINLINE CBlobT() : Tbase() {} |
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/** Constructor - makes new Blob with data */ |
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FORCEINLINE CBlobT(const Titem_ *p, size_t num_items) : Tbase((int8*)p, num_items * Titem_size) {} |
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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((Tbase::RawSize() % Titem_size) == 0);} |
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/** Take ownership constructor */ |
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FORCEINLINE CBlobT(const OnTransfer& ot) : Tbase(ot.m_pHdr_1) {} |
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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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FORCEINLINE void CheckIdx(size_t 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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FORCEINLINE Titem* Data() { return (Titem*)Tbase::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*)Tbase::RawData(); } |
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/** Return pointer to the idx-th data item - non-const version */ |
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FORCEINLINE Titem* Data(size_t 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(size_t idx) const { CheckIdx(idx); return (Data() + idx); } |
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/** Return number of items in the Blob */ |
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FORCEINLINE size_t Size() const { return (Tbase::RawSize() / Titem_size); } |
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/** Return total number of items that can fit in the Blob without buffer reallocation */ |
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FORCEINLINE size_t MaxSize() const { return (Tbase::MaxRawSize() / Titem_size); } |
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/** Return number of additional items that can fit in the Blob without buffer reallocation */ |
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FORCEINLINE size_t GetReserve() const { return ((Tbase::MaxRawSize() - Tbase::RawSize()) / Titem_size); } |
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/** 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((Tbase::RawSize() % Titem_size) == 0); |
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size_t 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(size_t num_items) { return (Titem*)Tbase::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(size_t num_items) |
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{ |
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Titem* pI = GrowSizeNC(num_items); |
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for (size_t 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(size_t num_items) |
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{ |
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assert((Tbase::RawSize() % Titem_size) == 0); |
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size_t old_size = Size(); |
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assert(num_items <= old_size); |
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size_t 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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Tbase::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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313 |
{ |
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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, size_t 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(size_t 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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{ |
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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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Tbase::ReduceRawSize(Titem_size); |
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} |
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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(size_t num_items) { return (Titem*)Tbase::MakeRawFreeSpace(num_items * Titem_size); } |
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|
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FORCEINLINE OnTransfer Transfer() {return OnTransfer(*this);}; |
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}; |
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356 |
|
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357 |
|
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#endif /* BLOB_HPP */ |