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// file : cutl/static-ptr.hxx
// copyright : Copyright (c) 2009-2013 Code Synthesis Tools CC
// license : MIT; see accompanying LICENSE file
#ifndef CUTL_STATIC_PTR_HXX
#define CUTL_STATIC_PTR_HXX
#include <cstddef> // std::size_t
namespace cutl
{
// This class template implements Jerry Schwarz's static
// initialization technique commonly found in iostream
// implementations.
//
// The second template argument is used to make sure the
// instantiation of static_ptr is unique.
//
template <typename X, typename ID>
class static_ptr
{
public:
static_ptr ()
{
if (count_ == 0)
x_ = new X;
++count_;
}
~static_ptr ()
{
if (--count_ == 0)
delete x_;
}
private:
static_ptr (static_ptr const&);
static_ptr&
operator= (static_ptr const&);
public:
X*
operator-> () const
{
return x_;
}
X&
operator* () const
{
return *x_;
}
X*
get () const
{
return x_;
}
private:
static X* x_;
static std::size_t count_;
};
template <typename X, typename ID>
X* static_ptr<X, ID>::x_ = 0;
template <typename X, typename ID>
std::size_t static_ptr<X, ID>::count_ = 0;
}
#endif // CUTL_STATIC_PTR_HXX
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