79 lines
1.1 KiB
C++
79 lines
1.1 KiB
C++
/* Stack - a template stack class (plus some handy methods)
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*
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* Copyright 2001-2005, Axel Dörfler, axeld@pinc-software.de.
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* This file may be used under the terms of the MIT License.
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*/
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#ifndef KERNEL_UTIL_STACK_H
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#define KERNEL_UTIL_STACK_H
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#include <SupportDefs.h>
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template<class T> class Stack {
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public:
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Stack()
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:
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fArray(NULL),
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fUsed(0),
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fMax(0)
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{
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}
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~Stack()
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{
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free(fArray);
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}
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bool IsEmpty() const
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{
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return fUsed == 0;
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}
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void MakeEmpty()
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{
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// could also free the memory
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fUsed = 0;
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}
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status_t Push(T value)
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{
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if (fUsed >= fMax) {
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fMax += 16;
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T *newArray = (T *)realloc(fArray, fMax * sizeof(T));
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if (newArray == NULL)
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return B_NO_MEMORY;
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fArray = newArray;
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}
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fArray[fUsed++] = value;
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return B_OK;
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}
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bool Pop(T *value)
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{
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if (fUsed == 0)
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return false;
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*value = fArray[--fUsed];
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return true;
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}
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T *Array()
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{
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return fArray;
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}
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int32 CountItems() const
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{
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return fUsed;
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}
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private:
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T *fArray;
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int32 fUsed;
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int32 fMax;
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};
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#endif /* KERNEL_UTIL_STACK_H */
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