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// file : cult/mm/static-ptr.hxx
// author : Boris Kolpackov <boris@kolpackov.net>
// copyright : Copyright (c) 2005-2010 Boris Kolpackov
// license : GNU GPL v2 + exceptions; see accompanying LICENSE file
#ifndef CULT_MM_STATIC_PTR_HXX
#define CULT_MM_STATIC_PTR_HXX
#include <cult/types/fundamental.hxx>
#include <cult/mm/new.hxx> // operator new
namespace Cult
{
namespace MM
{
namespace Bits
{
struct Default {};
}
template <typename X, typename Id = Bits::Default>
class StaticPtr: public NonCopyable
{
public:
X&
operator* () const
{
return instance ();
}
X*
operator-> () const
{
return &instance ();
}
public:
StaticPtr ()
{
if (i_ == 0) i_ = instance_ ();
}
~StaticPtr ()
{
// Note that we don't delete the object in order to avoid
// destruction order problem.
//
}
private:
static X&
instance ()
{
if (i_ == 0) i_ = instance_ ();
return *i_;
}
static X*
instance_ ()
{
static X* i = new (KeyList ()) X;
return i;
}
static X* i_;
};
template <typename X, typename Id>
X* StaticPtr<X, Id>::i_ = 0;
}
}
#endif // CULT_MM_STATIC_PTR_HXX
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