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/*
* Copyright 2015-2018, Intel Corporation
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* * Neither the name of the copyright holder nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/**
* @file
* Helper template for persistent ptr specialization.
*
* Based on Boost library smart_ptr implementation.
*/
#ifndef LIBPMEMOBJ_CPP_SPECIALIZATION_HPP
#define LIBPMEMOBJ_CPP_SPECIALIZATION_HPP
#include <memory>
namespace pmem
{
namespace detail
{
/* smart pointer specialization */
template <typename T>
struct sp_element {
typedef T type;
};
template <typename T>
struct sp_element<T[]> {
typedef T type;
};
template <typename T, std::size_t N>
struct sp_element<T[N]> {
typedef T type;
};
/* sp_dereference is a return type of operator* */
template <typename T>
struct sp_dereference {
typedef T &type;
};
template <>
struct sp_dereference<void> {
typedef void type;
};
template <>
struct sp_dereference<void const> {
typedef void type;
};
template <>
struct sp_dereference<void volatile> {
typedef void type;
};
template <>
struct sp_dereference<void const volatile> {
typedef void type;
};
template <typename T>
struct sp_dereference<T[]> {
typedef void type;
};
template <typename T, std::size_t N>
struct sp_dereference<T[N]> {
typedef void type;
};
/* sp_member_access is a return type of operator-> */
template <typename T>
struct sp_member_access {
typedef T *type;
};
template <typename T>
struct sp_member_access<T[]> {
typedef void type;
};
template <typename T, std::size_t N>
struct sp_member_access<T[N]> {
typedef void type;
};
/* sp_array_access is a return type of operator[] */
template <typename T>
struct sp_array_access {
typedef T &type;
};
template <>
struct sp_array_access<void> {
typedef struct does_not_exist {
} & type;
};
template <typename T>
struct sp_array_access<T[]> {
typedef T &type;
};
template <typename T, std::size_t N>
struct sp_array_access<T[N]> {
typedef T &type;
};
/* sp_extent is used for operator[] index checking */
template <typename T>
struct sp_extent {
enum _vt { value = 0 };
};
template <typename T, std::size_t N>
struct sp_extent<T[N]> {
enum _vt { value = N };
};
} /* namespace detail */
} /* namespace pmem */
#endif /* LIBPMEMOBJ_CPP_SPECIALIZATION_HPP */
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