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// MIT License
// Copyright (c) 2019 Erin Catto
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
#ifndef B2_GROWABLE_STACK_H
#define B2_GROWABLE_STACK_H
#include <string.h>
#include "b2_settings.h"
/// This is a growable LIFO stack with an initial capacity of N.
/// If the stack size exceeds the initial capacity, the heap is used
/// to increase the size of the stack.
template <typename T, int32 N>
class b2GrowableStack
{
public:
b2GrowableStack()
{
m_stack = m_array;
m_count = 0;
m_capacity = N;
}
~b2GrowableStack()
{
if (m_stack != m_array)
{
b2Free(m_stack);
m_stack = nullptr;
}
}
void Push(const T& element)
{
if (m_count == m_capacity)
{
T* old = m_stack;
m_capacity *= 2;
m_stack = (T*)b2Alloc(m_capacity * sizeof(T));
memcpy(m_stack, old, m_count * sizeof(T));
if (old != m_array)
{
b2Free(old);
}
}
m_stack[m_count] = element;
++m_count;
}
T Pop()
{
b2Assert(m_count > 0);
--m_count;
return m_stack[m_count];
}
int32 GetCount()
{
return m_count;
}
private:
T* m_stack;
T m_array[N];
int32 m_count;
int32 m_capacity;
};
#endif
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