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author | rubidium <rubidium@openttd.org> | 2007-01-02 19:19:48 +0000 |
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committer | rubidium <rubidium@openttd.org> | 2007-01-02 19:19:48 +0000 |
commit | 66bbf336c6af7353ef0aeed58002c46543b30635 (patch) | |
tree | ad4a63860df2626b22f77e7dac712e958bea54cb /src/yapf/fixedsizearray.hpp | |
parent | ccc0a3f4dbf58c005b22341ac8874252924690cd (diff) | |
download | openttd-66bbf336c6af7353ef0aeed58002c46543b30635.tar.xz |
(svn r7759) -Merge: makefile rewrite. This merge features:
- A proper ./configure, so everything needs to be configured only once, not for every make.
- Usage of makedepend when available. This greatly reduces the time needed for generating the dependencies.
- A generator for all project files. There is a single file with sources, which is used to generate Makefiles and the project files for MSVC.
- Proper support for OSX universal binaries.
- Object files for non-MSVC compiles are also placed in separate directories, making is faster to switch between debug and release compiles and it does not touch the directory with the source files.
- Functionality to make a bundle of all needed files for for example a nightly or distribution of a binary with all needed GRFs and language files.
Note: as this merge moves almost all files, it is recommended to make a backup of your working copy before updating your working copy.
Diffstat (limited to 'src/yapf/fixedsizearray.hpp')
-rw-r--r-- | src/yapf/fixedsizearray.hpp | 99 |
1 files changed, 99 insertions, 0 deletions
diff --git a/src/yapf/fixedsizearray.hpp b/src/yapf/fixedsizearray.hpp new file mode 100644 index 000000000..48b177f3c --- /dev/null +++ b/src/yapf/fixedsizearray.hpp @@ -0,0 +1,99 @@ +/* $Id$ */ + +#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 */ |