specialization.hpp

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// SPDX-License-Identifier: BSD-3-Clause
/* Copyright 2015-2018, Intel Corporation */
 
#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 */