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/*****************************************************************************************[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 "base/check.h" |
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#include "prop/minisat/mtl/Vec.h" |
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namespace cvc5 { |
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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 |
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{ |
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Assert(index >= 0); |
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Assert(index < size()); |
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return buf[(first + index) % buf.size()]; |
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} |
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T& operator[](int index) |
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{ |
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Assert(index >= 0); |
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Assert(index < size()); |
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return buf[(first + index) % buf.size()]; |
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} |
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T peek() const |
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{ |
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Assert(first != end); |
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return buf[first]; |
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} |
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void pop() |
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{ |
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Assert(first != end); |
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first++; |
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if (first == buf.size()) first = 0; |
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} |
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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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} // namespace cvc5 |
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#endif |