first commit

ArrayStack/Cpp/arraystack.cpp

@@ -0,0 +1,101 @@
+#include <cstdlib>
+#include <cstdio>
+#include <cassert>
+#include <cstring>
+
+template <typename T, size_t growSize = 10, size_t initialSize = 0> class ArrayStack
+{
+public:
+    ArrayStack()
+        : 
+            m_array(nullptr)
+        ,   m_arrayLen(0)
+        ,   m_currentHead(0)
+        ,   m_growSize(growSize)
+    {
+        if (initialSize > 0)
+        {
+            grow(initialSize);
+        }
+    }
+
+    ~ArrayStack()
+    {
+
+    }
+
+    void push(T obj)
+    {
+        if (m_currentHead+1 >= m_arrayLen)
+        {
+            grow();
+        }
+
+        m_array[m_currentHead] = obj;
+        m_currentHead++;
+    }
+
+    void pop(T *obj)
+    {
+        if (m_currentHead > 0)
+        {            
+            auto temp = m_array[m_currentHead-1];
+            *obj = temp;
+            m_currentHead--;
+        }
+        else
+        {
+            assert(false);
+        }
+    }
+
+
+private:
+    void    grow(size_t size = growSize)
+    {
+        // Allocate for the new size
+        auto newArrayLen = size + m_arrayLen;
+        auto newArray = (T*)malloc(sizeof(T) * newArrayLen);
+        
+        // Copy over the old array
+        if (newArray)
+        {
+            memcpy(newArray, m_array, m_arrayLen * sizeof(T));
+        }
+
+        // delete the old one
+        if (m_array) free(m_array);
+
+        // Set the new array
+        m_array = newArray;
+        m_arrayLen = newArrayLen;
+    }
+    
+
+    T *m_array;
+    size_t m_arrayLen;
+    size_t m_currentHead;
+    const size_t m_growSize;
+};
+
+#ifndef EXTERN_MAIN
+int main(int argc, char **argv)
+{
+    ArrayStack<int> stack;
+    const size_t stackSize = 50;
+
+    for (size_t i = 0; i < stackSize; i++)
+    {
+        stack.push(i);
+    }
+
+    for (size_t i = 0; i < stackSize; i++)
+    {
+        int dest;
+        stack.pop(&dest);
+        printf("Got: %d\n", dest);
+    }
+
+    return 0;
+}
+#endif