55 lines
1.1 KiB
C++
55 lines
1.1 KiB
C++
/* File : example.h */
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// A simple exception
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class EmptyError { };
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class FullError {
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public:
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int maxsize;
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FullError(int m) : maxsize(m) { }
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};
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#if defined(_MSC_VER)
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#pragma warning(disable: 4290) // C++ exception specification ignored except to indicate a function is not __declspec(nothrow)
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#endif
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template<typename T> class Queue {
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int maxsize;
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T *items;
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int nitems;
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int last;
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public:
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Queue(int size) {
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maxsize = size;
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items = new T[size];
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nitems = 0;
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last = 0;
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}
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~Queue() {
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delete [] items;
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}
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void enqueue(T x) throw(FullError) {
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if (nitems == maxsize) {
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throw FullError(maxsize);
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}
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items[last] = x;
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last = (last + 1) % maxsize;
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nitems++;
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}
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T dequeue() {
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T x;
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if (nitems == 0) throw EmptyError();
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x = items[(last + maxsize - nitems) % maxsize];
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nitems--;
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return x;
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}
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int length() {
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return nitems;
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}
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};
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#if defined(_MSC_VER)
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#pragma warning(default: 4290) // C++ exception specification ignored except to indicate a function is not __declspec(nothrow)
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#endif
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