Created
April 7, 2018 06:05
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Queue
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| template < typename T > | |
| class QueueT | |
| { | |
| public: | |
| QueueT( int64_t max_size ) | |
| : _max_size( max_size ) | |
| , _size( 0 ) | |
| , _front( 0 ) | |
| , _rear( -1 ) | |
| { | |
| assert( _max_size > 0 ); | |
| _items = new T [ _max_size ]; | |
| } | |
| virtual ~QueueT() | |
| { | |
| delete [] _items; | |
| _items = nullptr; | |
| _max_size = 0; | |
| _size = 0; | |
| _front = 0; | |
| _rear = -1; | |
| } | |
| void enqueue( T item ) | |
| { | |
| if ( full() ) | |
| { | |
| throw string( "overflow" ); | |
| } | |
| _rear = ( _rear + 1 ) % _max_size; | |
| _items[ _rear ] = item; | |
| _size++; | |
| } | |
| void dequeue() | |
| { | |
| if ( empty() ) | |
| { | |
| throw string( "underflow" ); | |
| } | |
| _front = ( _front + 1 ) % _max_size; | |
| _size--; | |
| } | |
| T peek() const | |
| { | |
| if ( empty() ) | |
| { | |
| throw string( "underflow" ); | |
| } | |
| return _items[ _front ]; | |
| } | |
| bool full() const | |
| { | |
| return ( _size == _max_size ); | |
| } | |
| bool empty() const | |
| { | |
| return ( _size == 0 ); | |
| } | |
| int64_t size() const | |
| { | |
| return _size; | |
| } | |
| private: | |
| int64_t _max_size; | |
| int64_t _size; | |
| int64_t _front, _rear; | |
| T * _items; | |
| }; |
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