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POCustom allocator leaking memory
 

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  1. POCustom allocator leaking memory
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    <p>So the implementation of my custom allocator has a base class with 2 static variables, one to track the instances of allocators and one is the memory-pool.</p> <pre><code>template &lt;typename T&gt; class Allocator : public Base_Allocator { public: // Required types typedef T value_type; typedef size_t size_type; typedef ptrdiff_t difference_type; typedef T* pointer; typedef const T* const_pointer; typedef T&amp; reference; typedef const T&amp; const_reference; template &lt;typename U&gt; struct rebind { typedef Allocator&lt;U&gt; other; }; // Required Opeartions explicit Allocator(void) : Base_Allocator() { } ~Allocator(void) { } Allocator(const Allocator&amp; a) : Base_Allocator() { } // copy constructor pointer address(reference value) const { return &amp;value; } const_pointer address(const_reference value) const { return &amp;value; } size_type max_size(void) const { size_type m = 4096; return m; } pointer allocate(size_type n) { return static_cast&lt;value_type*&gt;( Base_Allocator::m_pMemMngr-&gt;Alloc( sizeof(value_type) * n) ); } void deallocate(pointer p, size_type n) { Base_Allocator::m_pMemMngr-&gt;Free(p); } void construct(pointer p, const T&amp; value) { new((T*)p) T(value); } void destroy(pointer p) { p-&gt;~T(); } bool operator == (const Allocator&amp; right) const { return true; } bool operator != (const Allocator&amp; right) const { return false; } }; </code></pre> <p>and here is the baseclass...</p> <pre><code>class Base_Allocator { public: static int m_icount; static MemoryManager* m_pMemMngr; public: Base_Allocator(void) { m_icount++; if(!m_pMemMngr) { NEW(m_pMemMngr); m_pMemMngr-&gt;Init(); } } ~Base_Allocator(void) { m_icount--; if(m_icount&lt;0) { SAFE_DELETE(m_pMemMngr); } } }; </code></pre> <p>Here is the definition of the static members</p> <pre><code>#include "Base.h" int Base_Allocator::m_icount = 0; MemoryManager* Base_Allocator::m_pMemMngr = nullptr; </code></pre> <p>my thing here is that the memory is never being released. I'm passing it to a forward_list and this forward list creates 3 allocators but it also deletes 3. That's the reason I have the base class only free the memory once it is less than 0. But things haven't really worked out too well. -1 is never reached so I'm never releasing the memory in the memorypools. Any ideas would be appreciated.</p>
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    1. COI removed the `MemoryPool..` parts from your code and it compiled fine with gcc-4.8. Maybe it is a VS issue. I am not sure since I didn't test the whole code. But you can give it a shot on a unix machine.
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