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-rw-r--r--src/misc/blob.hpp406
1 files changed, 293 insertions, 113 deletions
diff --git a/src/misc/blob.hpp b/src/misc/blob.hpp
index 97bd01160..86d924daf 100644
--- a/src/misc/blob.hpp
+++ b/src/misc/blob.hpp
@@ -15,104 +15,196 @@ FORCEINLINE void MemCpyT(Titem_* d, const Titem_* s, int num_items = 1)
memcpy(d, s, num_items * sizeof(Titem_));
}
-
/** Base class for simple binary blobs.
- * Item is byte.
- * The word 'simple' means:
- * - no configurable allocator type (always made from heap)
- * - no smart deallocation - deallocation must be called from the same
- * module (DLL) where the blob was allocated
- * - no configurable allocation policy (how big blocks should be allocated)
- * - no extra ownership policy (i.e. 'copy on write') when blob is copied
- * - no thread synchronization at all
- *
- * Internal member layout:
- * 1. The only class member is pointer to the first item (see union ptr_u).
- * 2. Allocated block contains the blob header (see CHdr) followed by the raw byte data.
- * Always, when it allocates memory the allocated size is:
- * sizeof(CHdr) + <data capacity>
- * 3. Two 'virtual' members (m_size and m_max_size) are stored in the CHdr at beginning
- * of the alloated block.
- * 4. The pointer (in ptr_u) points behind the header (to the first data byte).
- * When memory block is allocated, the sizeof(CHdr) it added to it.
- * 5. Benefits of this layout:
- * - items are accessed in the simplest possible way - just dereferencing the pointer,
- * which is good for performance (assuming that data are accessed most often).
- * - sizeof(blob) is the same as the size of any other pointer
- * 6. Drawbacks of this layout:
- * - the fact, that pointer to the alocated block is adjusted by sizeof(CHdr) before
- * it is stored can lead to several confusions:
- * - it is not common pattern so the implementation code is bit harder to read
- * - valgrind can generate warning that allocated block is lost (not accessible)
- * */
+* Item is byte.
+* The word 'simple' means:
+* - no configurable allocator type (always made from heap)
+* - no smart deallocation - deallocation must be called from the same
+* module (DLL) where the blob was allocated
+* - no configurable allocation policy (how big blocks should be allocated)
+* - no extra ownership policy (i.e. 'copy on write') when blob is copied
+* - no thread synchronization at all
+*
+* Internal member layout:
+* 1. The only class member is pointer to the first item (see union ptr_u).
+* 2. Allocated block contains the blob header (see CHdr) followed by the raw byte data.
+* Always, when it allocates memory the allocated size is:
+* sizeof(CHdr) + <data capacity>
+* 3. Two 'virtual' members (m_size and m_max_size) are stored in the CHdr at beginning
+* of the alloated block.
+* 4. The pointter (in ptr_u) pobsize_ts behind the header (to the first data byte).
+* When memory block is allocated, the sizeof(CHdr) it added to it.
+* 5. Benefits of this layout:
+* - items are accessed in the simplest possible way - just dereferencing the pointer,
+* which is good for performance (assuming that data are accessed most often).
+* - sizeof(blob) is the same as the size of any other pointer
+* 6. Drawbacks of this layout:
+* - the fact, that pointer to the alocated block is adjusted by sizeof(CHdr) before
+* it is stored can lead to several confusions:
+* - it is not common pattern so the implementation code is bit harder to read
+* - valgrind can generate warning that allocated block is lost (not accessible)
+* */
class CBlobBaseSimple {
+public:
+ typedef ::ptrdiff_t bsize_t;
+ typedef ::byte bitem_t;
+
protected:
/** header of the allocated memory block */
struct CHdr {
- int m_size; ///< actual blob size in bytes
- int m_max_size; ///< maximum (allocated) size in bytes
+ bsize_t m_size; ///< actual blob size in bytes
+ bsize_t m_max_size; ///< maximum (allocated) size in bytes
};
/** type used as class member */
union {
- int8 *m_pData; ///< pointer to the first byte of data
- CHdr *m_pHdr_1; ///< pointer just after the CHdr holding m_size and m_max_size
+ bitem_t *m_pData; ///< ptr to the first byte of data
+ wchar_t *m_pwData; ///< ptr to the first byte of data
+ CHdr *m_pHdr_1; ///< ptr just after the CHdr holding m_size and m_max_size
} ptr_u;
public:
- static const int Ttail_reserve = 4; ///< four extra bytes will be always allocated and zeroed at the end
+ static const bsize_t Ttail_reserve = 4; ///< four extra bytes will be always allocated and zeroed at the end
/** default constructor - initializes empty blob */
FORCEINLINE CBlobBaseSimple() { InitEmpty(); }
+ /** constructor - create blob with data */
+ FORCEINLINE CBlobBaseSimple(const bitem_t *p, bsize_t num_bytes)
+ {
+ InitEmpty();
+ AppendRaw(p, num_bytes);
+ }
+
/** copy constructor */
FORCEINLINE CBlobBaseSimple(const CBlobBaseSimple& src)
{
InitEmpty();
AppendRaw(src);
}
+
+ /** move constructor - take ownership of blob data */
+ FORCEINLINE CBlobBaseSimple(CHdr * const & pHdr_1)
+ {
+ assert(pHdr_1 != NULL);
+ ptr_u.m_pHdr_1 = pHdr_1;
+ *(CHdr**)&pHdr_1 = NULL;
+ }
+
/** destructor */
- FORCEINLINE ~CBlobBaseSimple() { Free(); }
+ FORCEINLINE ~CBlobBaseSimple()
+ {
+ Free();
+ }
+
protected:
/** initialize the empty blob by setting the ptr_u.m_pHdr_1 pointer to the static CHdr with
- * both m_size and m_max_size containing zero */
- FORCEINLINE void InitEmpty() { static CHdr hdrEmpty[] = {{0, 0}, {0, 0}}; ptr_u.m_pHdr_1 = &hdrEmpty[1]; }
+ * both m_size and m_max_size containing zero */
+ FORCEINLINE void InitEmpty()
+ {
+ static CHdr hdrEmpty[] = {{0, 0}, {0, 0}};
+ ptr_u.m_pHdr_1 = &hdrEmpty[1];
+ }
+
/** initialize blob by attaching it to the given header followed by data */
- FORCEINLINE void Init(CHdr* hdr) { ptr_u.m_pHdr_1 = &hdr[1]; }
+ FORCEINLINE void Init(CHdr* hdr)
+ {
+ ptr_u.m_pHdr_1 = &hdr[1];
+ }
+
/** blob header accessor - use it rather than using the pointer arithmetics directly - non-const version */
- FORCEINLINE CHdr& Hdr() { return ptr_u.m_pHdr_1[-1]; }
+ FORCEINLINE CHdr& Hdr()
+ {
+ return ptr_u.m_pHdr_1[-1];
+ }
+
/** blob header accessor - use it rather than using the pointer arithmetics directly - const version */
- FORCEINLINE const CHdr& Hdr() const { return ptr_u.m_pHdr_1[-1]; }
+ FORCEINLINE const CHdr& Hdr() const
+ {
+ return ptr_u.m_pHdr_1[-1];
+ }
+
/** return reference to the actual blob size - used when the size needs to be modified */
- FORCEINLINE int& RawSizeRef() { return Hdr().m_size; };
+ FORCEINLINE bsize_t& RawSizeRef()
+ {
+ return Hdr().m_size;
+ };
public:
/** return true if blob doesn't contain valid data */
- FORCEINLINE bool IsEmpty() const { return RawSize() == 0; }
+ FORCEINLINE bool IsEmpty() const
+ {
+ return RawSize() == 0;
+ }
+
/** return the number of valid data bytes in the blob */
- FORCEINLINE int RawSize() const { return Hdr().m_size; };
+ FORCEINLINE bsize_t RawSize() const
+ {
+ return Hdr().m_size;
+ };
+
/** return the current blob capacity in bytes */
- FORCEINLINE int MaxRawSize() const { return Hdr().m_max_size; };
+ FORCEINLINE bsize_t MaxRawSize() const
+ {
+ return Hdr().m_max_size;
+ };
+
/** return pointer to the first byte of data - non-const version */
- FORCEINLINE int8* RawData() { return ptr_u.m_pData; }
+ FORCEINLINE bitem_t* RawData()
+ {
+ return ptr_u.m_pData;
+ }
+
/** return pointer to the first byte of data - const version */
- FORCEINLINE const int8* RawData() const { return ptr_u.m_pData; }
-#if 0 // reenable when needed
+ FORCEINLINE const bitem_t* RawData() const
+ {
+ return ptr_u.m_pData;
+ }
+
/** return the 32 bit CRC of valid data in the blob */
- FORCEINLINE uint32 Crc32() const {return CCrc32::Calc(RawData(), RawSize());}
-#endif //0
+ //FORCEINLINE bsize_t Crc32() const
+ //{
+ // return CCrc32::Calc(RawData(), RawSize());
+ //}
+
/** invalidate blob's data - doesn't free buffer */
- FORCEINLINE void Clear() { RawSizeRef() = 0; }
+ FORCEINLINE void Clear()
+ {
+ RawSizeRef() = 0;
+ }
+
/** free the blob's memory */
- FORCEINLINE void Free() { if (MaxRawSize() > 0) {RawFree(&Hdr()); InitEmpty();} }
+ FORCEINLINE void Free()
+ {
+ if (MaxRawSize() > 0) {
+ RawFree(&Hdr());
+ InitEmpty();
+ }
+ }
+
/** copy data from another blob - replaces any existing blob's data */
- FORCEINLINE void CopyFrom(const CBlobBaseSimple& src) { Clear(); AppendRaw(src); }
+ FORCEINLINE void CopyFrom(const CBlobBaseSimple& src)
+ {
+ Clear();
+ AppendRaw(src);
+ }
+
/** overtake ownership of data buffer from the source blob - source blob will become empty */
- FORCEINLINE void MoveFrom(CBlobBaseSimple& src) { Free(); ptr_u.m_pData = src.ptr_u.m_pData; src.InitEmpty(); }
+ FORCEINLINE void MoveFrom(CBlobBaseSimple& src)
+ {
+ Free();
+ ptr_u.m_pData = src.ptr_u.m_pData;
+ src.InitEmpty();
+ }
+
/** swap buffers (with data) between two blobs (this and source blob) */
- 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; }
+ FORCEINLINE void Swap(CBlobBaseSimple& src)
+ {
+ bitem_t *tmp = ptr_u.m_pData; ptr_u.m_pData = src.ptr_u.m_pData;
+ src.ptr_u.m_pData = tmp;
+ }
/** append new bytes at the end of existing data bytes - reallocates if necessary */
- FORCEINLINE void AppendRaw(int8 *p, int num_bytes)
+ FORCEINLINE void AppendRaw(const void *p, bsize_t num_bytes)
{
assert(p != NULL);
if (num_bytes > 0) {
@@ -130,27 +222,26 @@ public:
}
/** Reallocate if there is no free space for num_bytes bytes.
- * @return pointer to the new data to be added */
- FORCEINLINE int8* MakeRawFreeSpace(int num_bytes)
+ * @return pointer to the new data to be added */
+ FORCEINLINE bitem_t* MakeRawFreeSpace(bsize_t num_bytes)
{
assert(num_bytes >= 0);
- int new_size = RawSize() + num_bytes;
+ bsize_t new_size = RawSize() + num_bytes;
if (new_size > MaxRawSize()) SmartAlloc(new_size);
- FixTail();
return ptr_u.m_pData + RawSize();
}
/** Increase RawSize() by num_bytes.
- * @return pointer to the new data added */
- FORCEINLINE int8* GrowRawSize(int num_bytes)
+ * @return pointer to the new data added */
+ FORCEINLINE bitem_t* GrowRawSize(bsize_t num_bytes)
{
- int8* pNewData = MakeRawFreeSpace(num_bytes);
+ bitem_t* pNewData = MakeRawFreeSpace(num_bytes);
RawSizeRef() += num_bytes;
return pNewData;
}
/** Decrease RawSize() by num_bytes. */
- FORCEINLINE void ReduceRawSize(int num_bytes)
+ FORCEINLINE void ReduceRawSize(bsize_t num_bytes)
{
if (MaxRawSize() > 0 && num_bytes > 0) {
assert(num_bytes <= RawSize());
@@ -158,15 +249,16 @@ public:
else RawSizeRef() = 0;
}
}
+
/** reallocate blob data if needed */
- void SmartAlloc(int new_size)
+ void SmartAlloc(bsize_t new_size)
{
- int old_max_size = MaxRawSize();
+ bsize_t old_max_size = MaxRawSize();
if (old_max_size >= new_size) return;
// calculate minimum block size we need to allocate
- int min_alloc_size = sizeof(CHdr) + new_size + Ttail_reserve;
+ bsize_t min_alloc_size = sizeof(CHdr) + new_size + Ttail_reserve;
// ask allocation policy for some reasonable block size
- int alloc_size = AllocPolicy(min_alloc_size);
+ bsize_t alloc_size = AllocPolicy(min_alloc_size);
// allocate new block
CHdr* pNewHdr = RawAlloc(alloc_size);
// setup header
@@ -181,8 +273,9 @@ public:
if (old_max_size > 0)
RawFree(pOldHdr);
}
+
/** simple allocation policy - can be optimized later */
- FORCEINLINE static int AllocPolicy(int min_alloc)
+ FORCEINLINE static bsize_t AllocPolicy(bsize_t min_alloc)
{
if (min_alloc < (1 << 9)) {
if (min_alloc < (1 << 5)) return (1 << 5);
@@ -201,58 +294,133 @@ public:
}
/** all allocation should happen here */
- static FORCEINLINE CHdr* RawAlloc(int num_bytes) { return (CHdr*)malloc(num_bytes); }
+ static FORCEINLINE CHdr* RawAlloc(bsize_t num_bytes)
+ {
+ return (CHdr*)malloc(num_bytes);
+ }
+
/** all deallocations should happen here */
- static FORCEINLINE void RawFree(CHdr* p) { free(p); }
+ static FORCEINLINE void RawFree(CHdr* p)
+ {
+ free(p);
+ }
/** fixing the four bytes at the end of blob data - useful when blob is used to hold string */
- FORCEINLINE void FixTail()
+ FORCEINLINE void FixTail() const
{
if (MaxRawSize() > 0) {
- int8 *p = &ptr_u.m_pData[RawSize()];
- for (int i = 0; i < Ttail_reserve; i++) p[i] = 0;
+ bitem_t *p = &ptr_u.m_pData[RawSize()];
+ for (bsize_t i = 0; i < Ttail_reserve; i++) {
+ p[i] = 0;
+ }
}
}
};
/** Blob - simple dynamic Titem_ array. Titem_ (template argument) is a placeholder for any type.
- * Titem_ can be any integral type, pointer, or structure. Using Blob instead of just plain C array
- * simplifies the resource management in several ways:
- * 1. When adding new item(s) it automatically grows capacity if needed.
- * 2. When variable of type Blob comes out of scope it automatically frees the data buffer.
- * 3. Takes care about the actual data size (number of used items).
- * 4. Dynamically constructs only used items (as opposite of static array which constructs all items) */
+* Titem_ can be any integral type, pointer, or structure. Using Blob instead of just plain C array
+* simplifies the resource management in several ways:
+* 1. When adding new item(s) it automatically grows capacity if needed.
+* 2. When variable of type Blob comes out of scope it automatically frees the data buffer.
+* 3. Takes care about the actual data size (number of used items).
+* 4. Dynamically constructs only used items (as opposite of static array which constructs all items) */
template <class Titem_, class Tbase_ = CBlobBaseSimple>
-class CBlobT : public CBlobBaseSimple {
+class CBlobT : public Tbase_ {
// make template arguments public:
public:
typedef Titem_ Titem;
typedef Tbase_ Tbase;
+ typedef typename Tbase::bsize_t bsize_t;
- static const int Titem_size = sizeof(Titem);
+ static const bsize_t Titem_size = sizeof(Titem);
+
+ struct OnTransfer {
+ typename Tbase_::CHdr *m_pHdr_1;
+ 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;}
+ OnTransfer(CBlobT& src) : m_pHdr_1(src.ptr_u.m_pHdr_1) {src.InitEmpty();}
+ ~OnTransfer() {assert(m_pHdr_1 == NULL);}
+ };
/** Default constructor - makes new Blob ready to accept any data */
- FORCEINLINE CBlobT() : Tbase() {}
+ FORCEINLINE CBlobT()
+ : Tbase()
+ {}
+
+ /** Constructor - makes new Blob with data */
+ FORCEINLINE CBlobT(const Titem_ *p, bsize_t num_items)
+ : Tbase((typename Tbase_::bitem_t*)p, num_items * Titem_size)
+ {}
+
/** Copy constructor - make new blob to become copy of the original (source) blob */
- FORCEINLINE CBlobT(const Tbase& src) : Tbase(src) {assert((RawSize() % Titem_size) == 0);}
+ FORCEINLINE CBlobT(const Tbase& src)
+ : Tbase(src)
+ {
+ assert((Tbase::RawSize() % Titem_size) == 0);
+ }
+
+ /** Take ownership constructor */
+ FORCEINLINE CBlobT(const OnTransfer& ot)
+ : Tbase(ot.m_pHdr_1)
+ {}
+
/** Destructor - ensures that allocated memory (if any) is freed */
- FORCEINLINE ~CBlobT() { Free(); }
+ FORCEINLINE ~CBlobT()
+ {
+ Free();
+ }
+
/** Check the validity of item index (only in debug mode) */
- FORCEINLINE void CheckIdx(int idx) { assert(idx >= 0); assert(idx < Size()); }
+ FORCEINLINE void CheckIdx(bsize_t idx)
+ {
+ assert(idx >= 0); assert(idx < Size());
+ }
+
/** Return pointer to the first data item - non-const version */
- FORCEINLINE Titem* Data() { return (Titem*)RawData(); }
+ FORCEINLINE Titem* Data()
+ {
+ return (Titem*)Tbase::RawData();
+ }
+
/** Return pointer to the first data item - const version */
- FORCEINLINE const Titem* Data() const { return (const Titem*)RawData(); }
+ FORCEINLINE const Titem* Data() const
+ {
+ return (const Titem*)Tbase::RawData();
+ }
+
/** Return pointer to the idx-th data item - non-const version */
- FORCEINLINE Titem* Data(int idx) { CheckIdx(idx); return (Data() + idx); }
+ FORCEINLINE Titem* Data(bsize_t idx)
+ {
+ CheckIdx(idx);
+ return (Data() + idx);
+ }
+
/** Return pointer to the idx-th data item - const version */
- FORCEINLINE const Titem* Data(int idx) const { CheckIdx(idx); return (Data() + idx); }
+ FORCEINLINE const Titem* Data(bsize_t idx) const
+ {
+ CheckIdx(idx); return (Data() + idx);
+ }
+
/** Return number of items in the Blob */
- FORCEINLINE int Size() const { return (RawSize() / Titem_size); }
+ FORCEINLINE bsize_t Size() const
+ {
+ return (Tbase::RawSize() / Titem_size);
+ }
+
+ /** Return total number of items that can fit in the Blob without buffer reallocation */
+ FORCEINLINE bsize_t MaxSize() const
+ {
+ return (Tbase::MaxRawSize() / Titem_size);
+ }
+ /** Return number of additional items that can fit in the Blob without buffer reallocation */
+ FORCEINLINE bsize_t GetReserve() const
+ {
+ return ((Tbase::MaxRawSize() - Tbase::RawSize()) / Titem_size);
+ }
+
/** Free the memory occupied by Blob destroying all items */
FORCEINLINE void Free()
{
- assert((RawSize() % Titem_size) == 0);
- int old_size = Size();
+ assert((Tbase::RawSize() % Titem_size) == 0);
+ bsize_t old_size = Size();
if (old_size > 0) {
// destroy removed items;
Titem* pI_last_to_destroy = Data(0);
@@ -260,27 +428,34 @@ public:
}
Tbase::Free();
}
+
/** Grow number of data items in Blob by given number - doesn't construct items */
- FORCEINLINE Titem* GrowSizeNC(int num_items) { return (Titem*)GrowRawSize(num_items * Titem_size); }
+ FORCEINLINE Titem* GrowSizeNC(bsize_t num_items)
+ {
+ return (Titem*)Tbase::GrowRawSize(num_items * Titem_size);
+ }
+
/** Grow number of data items in Blob by given number - constructs new items (using Titem_'s default constructor) */
- FORCEINLINE Titem* GrowSizeC(int num_items)
+ FORCEINLINE Titem* GrowSizeC(bsize_t num_items)
{
Titem* pI = GrowSizeNC(num_items);
- for (int i = num_items; i > 0; i--, pI++) new (pI) Titem();
+ for (bsize_t i = num_items; i > 0; i--, pI++) new (pI) Titem();
}
+
/** Destroy given number of items and reduce the Blob's data size */
- FORCEINLINE void ReduceSize(int num_items)
+ FORCEINLINE void ReduceSize(bsize_t num_items)
{
- assert((RawSize() % Titem_size) == 0);
- int old_size = Size();
+ assert((Tbase::RawSize() % Titem_size) == 0);
+ bsize_t old_size = Size();
assert(num_items <= old_size);
- int new_size = (num_items <= old_size) ? (old_size - num_items) : 0;
+ bsize_t new_size = (num_items <= old_size) ? (old_size - num_items) : 0;
// destroy removed items;
Titem* pI_last_to_destroy = Data(new_size);
for (Titem* pI = Data(old_size - 1); pI >= pI_last_to_destroy; pI--) pI->~Titem();
// remove them
- ReduceRawSize(num_items * Titem_size);
+ Tbase::ReduceRawSize(num_items * Titem_size);
}
+
/** Append one data item at the end (calls Titem_'s default constructor) */
FORCEINLINE Titem* AppendNew()
{
@@ -288,6 +463,7 @@ public:
Titem* pNewItem = new (&dst) Titem(); // construct the new item by calling in-place new operator
return pNewItem;
}
+
/** Append the copy of given item at the end of Blob (using copy constructor) */
FORCEINLINE Titem* Append(const Titem& src)
{
@@ -295,8 +471,9 @@ public:
Titem* pNewItem = new (&dst) Titem(src); // construct the new item by calling in-place new operator with copy ctor()
return pNewItem;
}
+
/** Add given items (ptr + number of items) at the end of blob */
- FORCEINLINE Titem* Append(const Titem* pSrc, int num_items)
+ FORCEINLINE Titem* Append(const Titem* pSrc, bsize_t num_items)
{
Titem* pDst = GrowSizeNC(num_items);
Titem* pDstOrg = pDst;
@@ -304,14 +481,16 @@ public:
while (pDst < pDstEnd) new (pDst++) Titem(*(pSrc++));
return pDstOrg;
}
+
/** Remove item with the given index by replacing it by the last item and reducing the size by one */
- FORCEINLINE void RemoveBySwap(int idx)
+ FORCEINLINE void RemoveBySwap(bsize_t idx)
{
CheckIdx(idx);
// destroy removed item
Titem* pRemoved = Data(idx);
RemoveBySwap(pRemoved);
}
+
/** Remove item given by pointer replacing it by the last item and reducing the size by one */
FORCEINLINE void RemoveBySwap(Titem* pItem)
{
@@ -325,20 +504,21 @@ public:
// destroy the last item
pLast->~Titem_();
// and reduce the raw blob size
- ReduceRawSize(Titem_size);
+ Tbase::ReduceRawSize(Titem_size);
}
+
/** Ensures that given number of items can be added to the end of Blob. Returns pointer to the
- * first free (unused) item */
- FORCEINLINE Titem* MakeFreeSpace(int num_items) { return (Titem*)MakeRawFreeSpace(num_items * Titem_size); }
-};
+ * first free (unused) item */
+ FORCEINLINE Titem* MakeFreeSpace(bsize_t num_items)
+ {
+ return (Titem*)Tbase::MakeRawFreeSpace(num_items * Titem_size);
+ }
-// simple string implementation
-struct CStrA : public CBlobT<char>
-{
- typedef CBlobT<char> base;
- CStrA(const char* str = NULL) {Append(str);}
- FORCEINLINE CStrA(const CBlobBaseSimple& src) : base(src) {}
- void Append(const char* str) {if (str != NULL && str[0] != '\0') base::Append(str, (int)strlen(str));}
+ FORCEINLINE OnTransfer Transfer()
+ {
+ return OnTransfer(*this);
+ };
};
+
#endif /* BLOB_HPP */
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