python/include/boost/python/instance_holder.hpp at python313 · boostorg/python · GitHub

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// Copyright David Abrahams 2002.

// Distributed under the Boost Software License, Version 1.0. (See

// accompanying file LICENSE_1_0.txt or copy at

// http://www.boost.org/LICENSE_1_0.txt)

#ifndef INSTANCE_HOLDER_DWA2002517_HPP

# define INSTANCE_HOLDER_DWA2002517_HPP

# include <boost/python/detail/prefix.hpp>

# include <boost/noncopyable.hpp>

# include <boost/python/type_id.hpp>

# include <cstddef>

namespace boost { namespace python {

// Base class for all holders

struct BOOST_PYTHON_DECL instance_holder : private noncopyable

{

public:

instance_holder();

virtual ~instance_holder();

// return the next holder in a chain

instance_holder* next() const;

// When the derived holder actually holds by [smart] pointer and

// null_ptr_only is set, only report that the type is held when

// the pointer is null. This is needed for proper shared_ptr

// support, to prevent holding shared_ptrs from being found when

// converting from python so that we can use the conversion method

// that always holds the Python object.

virtual void* holds(type_info, bool null_ptr_only) = 0;

void install(PyObject* inst) throw();

// These functions should probably be located elsewhere.

// Allocate storage for an object of the given size at the given

// offset in the Python instance<> object if bytes are available

// there. Otherwise allocate size bytes of heap memory.

static void* allocate(PyObject*, std::size_t offset, std::size_t size, std::size_t alignment = 1);

// Deallocate storage from the heap if it was not carved out of

// the given Python object by allocate(), above.

static void deallocate(PyObject*, void* storage) throw();

private:

instance_holder* m_next;

};

// This macro is needed for implementation of derived holders

# define BOOST_PYTHON_UNFORWARD(N,ignored) (typename unforward<A##N>::type)(a##N)

// implementation

inline instance_holder* instance_holder::next() const

{

return m_next;

}

}} // namespace boost::python

#endif // INSTANCE_HOLDER_DWA2002517_HPP

python/include/boost/python/instance_holder.hpp at python313 · boostorg/python · GitHub

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