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-rw-r--r--yapf/fixedsizearray.hpp99
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diff --git a/yapf/fixedsizearray.hpp b/yapf/fixedsizearray.hpp
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--- a/yapf/fixedsizearray.hpp
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-/* $Id$ */
-
-#ifndef FIXEDSIZEARRAY_HPP
-#define FIXEDSIZEARRAY_HPP
-
-
-/** fixed size array
- * Upon construction it preallocates fixed size block of memory
- * for all items, but doesn't construct them. Item's construction
- * is delayed. */
-template <class Titem_, int Tcapacity_>
-struct CFixedSizeArrayT {
- /** the only member of fixed size array is pointer to the block
- * of C array of items. Header can be found on the offset -sizeof(CHdr). */
- Titem_ *m_items;
-
- /** header for fixed size array */
- struct CHdr
- {
- int m_num_items; ///< number of items in the array
- int m_ref_cnt; ///< block reference counter (used by copy constructor and by destructor)
- };
-
- // make types and constants visible from outside
- typedef Titem_ Titem; // type of array item
-
- static const int Tcapacity = Tcapacity_; // the array capacity (maximum size)
- static const int TitemSize = sizeof(Titem_); // size of item
- static const int ThdrSize = sizeof(CHdr); // size of header
-
- /** Default constructor. Preallocate space for items and header, then initialize header. */
- CFixedSizeArrayT()
- {
- // allocate block for header + items (don't construct items)
- m_items = (Titem*)(((int8*)malloc(ThdrSize + Tcapacity * sizeof(Titem))) + ThdrSize);
- SizeRef() = 0; // initial number of items
- RefCnt() = 1; // initial reference counter
- }
-
- /** Copy constructor. Preallocate space for items and header, then initialize header. */
- CFixedSizeArrayT(const CFixedSizeArrayT<Titem_, Tcapacity_>& src)
- {
- // share block (header + items) with the source array
- m_items = src.m_items;
- RefCnt()++; // now we share block with the source
- }
-
- /** destroy remaining items and free the memory block */
- ~CFixedSizeArrayT()
- {
- // release one reference to the shared block
- if ((--RefCnt()) > 0) return; // and return if there is still some owner
-
- Clear();
- // free the memory block occupied by items
- free(((int8*)m_items) - ThdrSize);
- m_items = NULL;
- }
-
- /** Clear (destroy) all items */
- FORCEINLINE void Clear()
- {
- // walk through all allocated items backward and destroy them
- for (Titem* pItem = &m_items[Size() - 1]; pItem >= m_items; pItem--) {
- pItem->~Titem_();
- }
- // number of items become zero
- SizeRef() = 0;
- }
-
-protected:
- /** return reference to the array header (non-const) */
- FORCEINLINE CHdr& Hdr() { return *(CHdr*)(((int8*)m_items) - ThdrSize); }
- /** return reference to the array header (const) */
- FORCEINLINE const CHdr& Hdr() const { return *(CHdr*)(((int8*)m_items) - ThdrSize); }
- /** return reference to the block reference counter */
- FORCEINLINE int& RefCnt() { return Hdr().m_ref_cnt; }
- /** return reference to number of used items */
- FORCEINLINE int& SizeRef() { return Hdr().m_num_items; }
-public:
- /** return number of used items */
- FORCEINLINE int Size() const { return Hdr().m_num_items; }
- /** return true if array is full */
- FORCEINLINE bool IsFull() const { return Size() >= Tcapacity; };
- /** return true if array is empty */
- FORCEINLINE bool IsEmpty() const { return Size() <= 0; };
- /** index validation */
- FORCEINLINE void CheckIdx(int idx) const { assert(idx >= 0); assert(idx < Size()); }
- /** add (allocate), but don't construct item */
- FORCEINLINE Titem& AddNC() { assert(!IsFull()); return m_items[SizeRef()++]; }
- /** add and construct item using default constructor */
- FORCEINLINE Titem& Add() { Titem& item = AddNC(); new(&item)Titem; return item; }
- /** return item by index (non-const version) */
- FORCEINLINE Titem& operator [] (int idx) { CheckIdx(idx); return m_items[idx]; }
- /** return item by index (const version) */
- FORCEINLINE const Titem& operator [] (int idx) const { CheckIdx(idx); return m_items[idx]; }
-};
-
-#endif /* FIXEDSIZEARRAY_HPP */