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#pragma once
#include <boost/noncopyable.hpp>
#include "../diagnostic/is_valid.hpp"
namespace pstade { namespace tomato {
struct screen_dc_if_null :
private boost::noncopyable
{
// ctor/dtor
explicit screen_dc_if_null(HDC hDC) : m_hDC(hDC), m_managed(false)
{
if (m_hDC == NULL) {
m_hDC = ::GetDC(NULL);
api_verify(m_hDC != NULL);
m_managed = true;
}
ATLASSERT(is_valid(m_hDC));
}
~screen_dc_if_null()
{
ATLASSERT(tomato::is_valid(m_hDC));
if (m_managed)
::DeleteDC(m_hDC);
}
// selector
HDC get_handle() const { return m_hDC; }
private:
HDC m_hDC;
bool m_managed;
};
} } // namespace pstade::tomato
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