shared_ptr.hh

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// -*- tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
// vi: set et ts=4 sw=2 sts=2:
 
#ifndef DUNE_SHARED_PTR_HH
#define DUNE_SHARED_PTR_HH
 
#include <memory>
 
#include <dune/common/typetraits.hh>
namespace Dune
{
  // pull in default implementations
  using std::shared_ptr;
  using std::make_shared;
 
  template<class T>
  struct null_deleter
  {
    void operator() (T*) const {}
  };
 
  template<typename T>
  inline shared_ptr<T> stackobject_to_shared_ptr(T & t)
  {
    return shared_ptr<T>(&t, null_deleter<T>());
  }
 
  template<typename T, typename T2>
  inline DUNE_DEPRECATED_MSG("Do not use the explicit casting version of stackobject_to_shared_ptr, just assign the result to a shared_ptr to the base class")
  std::enable_if_t<
    not std::is_same<T,T2>::value,
    shared_ptr<T>
    >
  stackobject_to_shared_ptr(T2 & t)
  {
    return shared_ptr<T2>(&t, null_deleter<T2>());
  }
 
 
  template<class T>
  auto wrap_or_move(T&& t)
  {
    return std::make_shared<std::decay_t<T>>(std::forward<T>(t));
  }
 
  template<class T>
  auto wrap_or_move(T& t)
  {
    return stackobject_to_shared_ptr(t);
  }
 
}
#endif