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69 lines
2.9 KiB
C++
69 lines
2.9 KiB
C++
/*****************************************************************************************[Queue.h]
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Copyright (c) 2003-2006, Niklas Een, Niklas Sorensson
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Copyright (c) 2007-2010, Niklas Sorensson
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Permission is hereby granted, free of charge, to any person obtaining a copy of this software and
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associated documentation files (the "Software"), to deal in the Software without restriction,
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including without limitation the rights to use, copy, modify, merge, publish, distribute,
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sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all copies or
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substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT
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NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
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DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT
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OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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**************************************************************************************************/
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#ifndef Minisat_Queue_h
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#define Minisat_Queue_h
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#include "Vec.h"
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namespace Minisat {
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//=================================================================================================
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template<class T>
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class Queue {
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vec<T> buf;
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int first;
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int end;
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public:
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typedef T Key;
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Queue() : buf(1), first(0), end(0) {}
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void clear (bool dealloc = false) { buf.clear(dealloc); buf.growTo(1); first = end = 0; }
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int size () const { return (end >= first) ? end - first : end - first + buf.size(); }
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const T& operator [] (int index) const { assert(index >= 0); assert(index < size()); return buf[(first + index) % buf.size()]; }
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T& operator [] (int index) { assert(index >= 0); assert(index < size()); return buf[(first + index) % buf.size()]; }
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T peek () const { assert(first != end); return buf[first]; }
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void pop () { assert(first != end); first++; if (first == buf.size()) first = 0; }
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void insert(T elem) { // INVARIANT: buf[end] is always unused
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buf[end++] = elem;
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if (end == buf.size()) end = 0;
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if (first == end){ // Resize:
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vec<T> tmp((buf.size()*3 + 1) >> 1);
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//**/printf("queue alloc: %d elems (%.1f MB)\n", tmp.size(), tmp.size() * sizeof(T) / 1000000.0);
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int i = 0;
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for (int j = first; j < buf.size(); j++) tmp[i++] = buf[j];
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for (int j = 0 ; j < end ; j++) tmp[i++] = buf[j];
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first = 0;
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end = buf.size();
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tmp.moveTo(buf);
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}
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}
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};
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//=================================================================================================
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}
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#endif
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