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///////////////////////////////////////////////////////////////////////////////
// Name: wx/msw/private/cotaskmemptr.h
// Purpose: RAII class for pointers to be freed with ::CoTaskMemFree().
// Author: PB
// Created: 2020-06-09
// Copyright: (c) 2020 wxWidgets team
// Licence: wxWindows licence
///////////////////////////////////////////////////////////////////////////////
#ifndef _WX_MSW_PRIVATE_COTASKMEMPTR_H_
#define _WX_MSW_PRIVATE_COTASKMEMPTR_H_
// needed for ::CoTaskMem{Alloc|Free}()
#include "wx/msw/wrapwin.h"
// ----------------------------------------------------------------------------
// wxCoTaskMemPtr: A barebone RAII class for pointers to be freed with ::CoTaskMemFree().
// ----------------------------------------------------------------------------
template <class T>
class wxCoTaskMemPtr
{
public:
typedef T element_type;
wxCoTaskMemPtr()
: m_ptr(NULL)
{}
explicit wxCoTaskMemPtr(T* ptr)
: m_ptr(ptr)
{}
// Uses ::CoTaskMemAlloc() to allocate size bytes.
explicit wxCoTaskMemPtr(size_t size)
: m_ptr(static_cast<T*>(::CoTaskMemAlloc(size)))
{}
~wxCoTaskMemPtr()
{
::CoTaskMemFree(m_ptr);
}
void reset(T* ptr = NULL)
{
if ( m_ptr != ptr )
{
::CoTaskMemFree(m_ptr);
m_ptr = ptr;
}
}
operator T*() const
{
return m_ptr;
}
// It would be better to forbid direct access completely but we do need it,
// so provide it but it can only be used to initialize the pointer,
// not to modify an existing one.
T** operator&()
{
wxASSERT_MSG(!m_ptr,
wxS("Can't get direct access to initialized pointer"));
return &m_ptr;
}
// Gives up the ownership of the pointer,
// making the caller responsible for freeing it.
T* release()
{
T* ptr(m_ptr);
m_ptr = NULL;
return ptr;
}
private:
T* m_ptr;
wxDECLARE_NO_COPY_TEMPLATE_CLASS(wxCoTaskMemPtr, T);
};
#endif // _WX_MSW_PRIVATE_COTASKMEMPTR_H_
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