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type_traits.hpp
1078 lines (931 loc) · 38.7 KB
/
type_traits.hpp
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//////////////////////////////////////////////////////////////////////////////
// (C) Copyright John Maddock 2000.
// (C) Copyright Ion Gaztanaga 2005-2015.
//
// 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)
//
// See http://www.boost.org/libs/move for documentation.
//
// The alignment and Type traits implementation comes from
// John Maddock's TypeTraits library.
//
// Some other tricks come from Howard Hinnant's papers and StackOverflow replies
//////////////////////////////////////////////////////////////////////////////
#ifndef BOOST_MOVE_DETAIL_TYPE_TRAITS_HPP
#define BOOST_MOVE_DETAIL_TYPE_TRAITS_HPP
#ifndef BOOST_CONFIG_HPP
# include <boost/config.hpp>
#endif
#
#if defined(BOOST_HAS_PRAGMA_ONCE)
# pragma once
#endif
#include <boost/move/detail/config_begin.hpp>
#include <boost/move/detail/workaround.hpp>
// move/detail
#include <boost/move/detail/meta_utils.hpp>
// other
#include <boost/assert.hpp>
#include <boost/static_assert.hpp>
// std
#include <cstddef>
//Use of Boost.TypeTraits leads to long preprocessed source code due to
//MPL dependencies. We'll use intrinsics directly and make or own
//simplified version of TypeTraits.
//If someday Boost.TypeTraits dependencies are minimized, we should
//revisit this file redirecting code to Boost.TypeTraits traits.
//These traits don't care about volatile, reference or other checks
//made by Boost.TypeTraits because no volatile or reference types
//can be hold in Boost.Containers. This helps to avoid any Boost.TypeTraits
//dependency.
// Helper macros for builtin compiler support.
// If your compiler has builtin support for any of the following
// traits concepts, then redefine the appropriate macros to pick
// up on the compiler support:
//
// (these should largely ignore cv-qualifiers)
// BOOST_MOVE_IS_POD(T) should evaluate to true if T is a POD type
// BOOST_MOVE_HAS_TRIVIAL_CONSTRUCTOR(T) should evaluate to true if "T x;" has no effect
// BOOST_MOVE_HAS_TRIVIAL_COPY(T) should evaluate to true if T(t) <==> memcpy
// BOOST_MOVE_HAS_TRIVIAL_MOVE_CONSTRUCTOR(T) should evaluate to true if T(boost::move(t)) <==> memcpy
// BOOST_MOVE_HAS_TRIVIAL_ASSIGN(T) should evaluate to true if t = u <==> memcpy
// BOOST_MOVE_HAS_TRIVIAL_MOVE_ASSIGN(T) should evaluate to true if t = boost::move(u) <==> memcpy
// BOOST_MOVE_HAS_TRIVIAL_DESTRUCTOR(T) should evaluate to true if ~T() has no effect
// BOOST_MOVE_HAS_NOTHROW_CONSTRUCTOR(T) should evaluate to true if "T x;" can not throw
// BOOST_MOVE_HAS_NOTHROW_COPY(T) should evaluate to true if T(t) can not throw
// BOOST_MOVE_HAS_NOTHROW_ASSIGN(T) should evaluate to true if t = u can not throw
// BOOST_MOVE_IS_ENUM(T) should evaluate to true it t is a union type.
//
// The following can also be defined: when detected our implementation is greatly simplified.
//
// BOOST_ALIGNMENT_OF(T) should evaluate to the alignment requirements of type T.
#if defined(__MSL_CPP__) && (__MSL_CPP__ >= 0x8000)
// Metrowerks compiler is acquiring intrinsic type traits support
// post version 8. We hook into the published interface to pick up
// user defined specializations as well as compiler intrinsics as
// and when they become available:
# include <msl_utility>
# define BOOST_MOVE_IS_UNION(T) BOOST_STD_EXTENSION_NAMESPACE::is_union<T>::value
# define BOOST_MOVE_IS_POD(T) BOOST_STD_EXTENSION_NAMESPACE::is_POD<T>::value
# define BOOST_MOVE_HAS_TRIVIAL_CONSTRUCTOR(T) BOOST_STD_EXTENSION_NAMESPACE::has_trivial_default_ctor<T>::value
# define BOOST_MOVE_HAS_TRIVIAL_COPY(T) BOOST_STD_EXTENSION_NAMESPACE::has_trivial_copy_ctor<T>::value
# define BOOST_MOVE_HAS_TRIVIAL_ASSIGN(T) BOOST_STD_EXTENSION_NAMESPACE::has_trivial_assignment<T>::value
# define BOOST_MOVE_HAS_TRIVIAL_DESTRUCTOR(T) BOOST_STD_EXTENSION_NAMESPACE::has_trivial_dtor<T>::value
#endif
#if (defined(BOOST_MSVC) && defined(BOOST_MSVC_FULL_VER) && (BOOST_MSVC_FULL_VER >=140050215))\
|| (defined(BOOST_INTEL) && defined(_MSC_VER) && (_MSC_VER >= 1500))
# define BOOST_MOVE_IS_UNION(T) __is_union(T)
# define BOOST_MOVE_IS_POD(T) (__is_pod(T) && __has_trivial_constructor(T))
# define BOOST_MOVE_IS_EMPTY(T) __is_empty(T)
# define BOOST_MOVE_HAS_TRIVIAL_CONSTRUCTOR(T) __has_trivial_constructor(T)
# define BOOST_MOVE_HAS_TRIVIAL_COPY(T) (__has_trivial_copy(T)|| ::boost::move_detail::is_pod<T>::value)
# define BOOST_MOVE_HAS_TRIVIAL_ASSIGN(T) (__has_trivial_assign(T) || ::boost::move_detail::is_pod<T>::value)
# define BOOST_MOVE_HAS_TRIVIAL_DESTRUCTOR(T) (__has_trivial_destructor(T) || ::boost::move_detail::is_pod<T>::value)
# define BOOST_MOVE_HAS_NOTHROW_CONSTRUCTOR(T) (__has_nothrow_constructor(T) || ::boost::move_detail::is_trivially_default_constructible<T>::value)
# define BOOST_MOVE_HAS_NOTHROW_COPY(T) (__has_nothrow_copy(T) || ::boost::move_detail::is_trivially_copy_constructible<T>::value)
# define BOOST_MOVE_HAS_NOTHROW_ASSIGN(T) (__has_nothrow_assign(T) || ::boost::move_detail::is_trivially_copy_assignable<T>::value)
# define BOOST_MOVE_IS_ENUM(T) __is_enum(T)
# if defined(_MSC_VER) && (_MSC_VER >= 1700)
# define BOOST_MOVE_HAS_TRIVIAL_MOVE_CONSTRUCTOR(T) (__has_trivial_move_constructor(T) || ::boost::move_detail::is_pod<T>::value)
# define BOOST_MOVE_HAS_TRIVIAL_MOVE_ASSIGN(T) (__has_trivial_move_assign(T) || ::boost::move_detail::is_pod<T>::value)
# endif
#endif
#if defined(BOOST_CLANG) && defined(__has_feature)
# if __has_feature(is_union)
# define BOOST_MOVE_IS_UNION(T) __is_union(T)
# endif
# if (!defined(__GLIBCXX__) || (__GLIBCXX__ >= 20080306 && __GLIBCXX__ != 20080519)) && __has_feature(is_pod)
# define BOOST_MOVE_IS_POD(T) __is_pod(T)
# endif
# if (!defined(__GLIBCXX__) || (__GLIBCXX__ >= 20080306 && __GLIBCXX__ != 20080519)) && __has_feature(is_empty)
# define BOOST_MOVE_IS_EMPTY(T) __is_empty(T)
# endif
# if __has_feature(has_trivial_constructor)
# define BOOST_MOVE_HAS_TRIVIAL_CONSTRUCTOR(T) __has_trivial_constructor(T)
# endif
# if __has_feature(has_trivial_copy)
# //There are problems with deleted copy constructors detected as trivially copyable.
# //http://stackoverflow.com/questions/12754886/has-trivial-copy-behaves-differently-in-clang-and-gcc-whos-right
# define BOOST_MOVE_HAS_TRIVIAL_COPY(T) (__has_trivial_copy(T) && ::boost::move_detail::is_copy_constructible<T>::value)
# endif
# if __has_feature(has_trivial_assign)
# define BOOST_MOVE_HAS_TRIVIAL_ASSIGN(T) (__has_trivial_assign(T) )
# endif
# if __has_feature(has_trivial_destructor)
# define BOOST_MOVE_HAS_TRIVIAL_DESTRUCTOR(T) __has_trivial_destructor(T)
# endif
# if __has_feature(has_nothrow_constructor)
# define BOOST_MOVE_HAS_NOTHROW_CONSTRUCTOR(T) __has_nothrow_constructor(T)
# endif
# if __has_feature(has_nothrow_copy)
# define BOOST_MOVE_HAS_NOTHROW_COPY(T) (__has_nothrow_copy(T))
# endif
# if __has_feature(is_nothrow_copy_assignable)
# define BOOST_MOVE_HAS_NOTHROW_ASSIGN(T) (__has_nothrow_assign(T))
# endif
# if __has_feature(is_enum)
# define BOOST_MOVE_IS_ENUM(T) __is_enum(T)
# endif
# if __has_feature(has_trivial_move_constructor)
# define BOOST_MOVE_HAS_TRIVIAL_MOVE_CONSTRUCTOR(T) __has_trivial_move_constructor(T)
# endif
# if __has_feature(has_trivial_move_assign)
# define BOOST_MOVE_HAS_TRIVIAL_MOVE_ASSIGN(T) __has_trivial_move_assign(T)
# endif
# define BOOST_MOVE_ALIGNMENT_OF(T) __alignof(T)
#endif
#if defined(__GNUC__) && ((__GNUC__ > 4) || ((__GNUC__ == 4) && (__GNUC_MINOR__ >= 3) && !defined(__GCCXML__))) && !defined(BOOST_CLANG)
#ifdef BOOST_INTEL
# define BOOST_MOVE_INTEL_TT_OPTS || ::boost::move_detail::is_pod<T>::value
#else
# define BOOST_MOVE_INTEL_TT_OPTS
#endif
# define BOOST_MOVE_IS_UNION(T) __is_union(T)
# define BOOST_MOVE_IS_POD(T) __is_pod(T)
# define BOOST_MOVE_IS_EMPTY(T) __is_empty(T)
# define BOOST_MOVE_HAS_TRIVIAL_CONSTRUCTOR(T) ((__has_trivial_constructor(T) BOOST_MOVE_INTEL_TT_OPTS))
# define BOOST_MOVE_HAS_TRIVIAL_COPY(T) ((__has_trivial_copy(T) BOOST_MOVE_INTEL_TT_OPTS))
# define BOOST_MOVE_HAS_TRIVIAL_ASSIGN(T) ((__has_trivial_assign(T) BOOST_MOVE_INTEL_TT_OPTS) )
# define BOOST_MOVE_HAS_TRIVIAL_DESTRUCTOR(T) (__has_trivial_destructor(T) BOOST_MOVE_INTEL_TT_OPTS)
# define BOOST_MOVE_HAS_NOTHROW_CONSTRUCTOR(T) (__has_nothrow_constructor(T) BOOST_MOVE_INTEL_TT_OPTS)
# define BOOST_MOVE_HAS_NOTHROW_COPY(T) ((__has_nothrow_copy(T) BOOST_MOVE_INTEL_TT_OPTS))
# define BOOST_MOVE_HAS_NOTHROW_ASSIGN(T) ((__has_nothrow_assign(T) BOOST_MOVE_INTEL_TT_OPTS))
# define BOOST_MOVE_IS_ENUM(T) __is_enum(T)
# if (!defined(unix) && !defined(__unix__)) || defined(__LP64__)
// GCC sometimes lies about alignment requirements
// of type double on 32-bit unix platforms, use the
// old implementation instead in that case:
# define BOOST_MOVE_ALIGNMENT_OF(T) __alignof__(T)
# endif
#endif
#if defined(__ghs__) && (__GHS_VERSION_NUMBER >= 600)
# define BOOST_MOVE_IS_UNION(T) __is_union(T)
# define BOOST_MOVE_IS_POD(T) __is_pod(T)
# define BOOST_MOVE_IS_EMPTY(T) __is_empty(T)
# define BOOST_MOVE_HAS_TRIVIAL_CONSTRUCTOR(T) __has_trivial_constructor(T)
# define BOOST_MOVE_HAS_TRIVIAL_COPY(T) (__has_trivial_copy(T))
# define BOOST_MOVE_HAS_TRIVIAL_ASSIGN(T) (__has_trivial_assign(T))
# define BOOST_MOVE_HAS_TRIVIAL_DESTRUCTOR(T) __has_trivial_destructor(T)
# define BOOST_MOVE_HAS_NOTHROW_CONSTRUCTOR(T) __has_nothrow_constructor(T)
# define BOOST_MOVE_HAS_NOTHROW_COPY(T) (__has_nothrow_copy(T))
# define BOOST_MOVE_HAS_NOTHROW_ASSIGN(T) (__has_nothrow_assign(T))
# define BOOST_MOVE_IS_ENUM(T) __is_enum(T)
# define BOOST_MOVE_ALIGNMENT_OF(T) __alignof__(T)
#endif
# if defined(__CODEGEARC__)
# define BOOST_MOVE_IS_UNION(T) __is_union(T)
# define BOOST_MOVE_IS_POD(T) __is_pod(T)
# define BOOST_MOVE_IS_EMPTY(T) __is_empty(T)
# define BOOST_MOVE_HAS_TRIVIAL_CONSTRUCTOR(T) (__has_trivial_default_constructor(T))
# define BOOST_MOVE_HAS_TRIVIAL_COPY(T) (__has_trivial_copy_constructor(T))
# define BOOST_MOVE_HAS_TRIVIAL_ASSIGN(T) (__has_trivial_assign(T))
# define BOOST_MOVE_HAS_TRIVIAL_DESTRUCTOR(T) (__has_trivial_destructor(T))
# define BOOST_MOVE_HAS_NOTHROW_CONSTRUCTOR(T) (__has_nothrow_default_constructor(T))
# define BOOST_MOVE_HAS_NOTHROW_COPY(T) (__has_nothrow_copy_constructor(T))
# define BOOST_MOVE_HAS_NOTHROW_ASSIGN(T) (__has_nothrow_assign(T))
# define BOOST_MOVE_IS_ENUM(T) __is_enum(T)
# define BOOST_MOVE_ALIGNMENT_OF(T) alignof(T)
#endif
//Fallback definitions
#ifdef BOOST_MOVE_IS_UNION
#define BOOST_MOVE_IS_UNION_IMPL(T) BOOST_MOVE_IS_UNION(T)
#else
#define BOOST_MOVE_IS_UNION_IMPL(T) false
#endif
#ifdef BOOST_MOVE_IS_POD
//in some compilers the intrinsic is limited to class types so add scalar and void
#define BOOST_MOVE_IS_POD_IMPL(T) (::boost::move_detail::is_scalar<T>::value ||\
::boost::move_detail::is_void<T>::value ||\
BOOST_MOVE_IS_POD(T))
#else
#define BOOST_MOVE_IS_POD_IMPL(T) \
(::boost::move_detail::is_scalar<T>::value || ::boost::move_detail::is_void<T>::value)
#endif
#ifdef BOOST_MOVE_IS_EMPTY
#define BOOST_MOVE_IS_EMPTY_IMPL(T) BOOST_MOVE_IS_EMPTY(T)
#else
#define BOOST_MOVE_IS_EMPTY_IMPL(T) ::boost::move_detail::is_empty_nonintrinsic<T>::value
#endif
#ifdef BOOST_MOVE_HAS_TRIVIAL_COPY
#define BOOST_MOVE_IS_TRIVIALLY_COPY_CONSTRUCTIBLE(T) BOOST_MOVE_HAS_TRIVIAL_COPY(T)
#else
#define BOOST_MOVE_IS_TRIVIALLY_COPY_CONSTRUCTIBLE(T) ::boost::move_detail::is_pod<T>::value
#endif
#ifdef BOOST_MOVE_HAS_TRIVIAL_CONSTRUCTOR
#define BOOST_MOVE_IS_TRIVIALLY_DEFAULT_CONSTRUCTIBLE(T) BOOST_MOVE_HAS_TRIVIAL_CONSTRUCTOR(T)
#else
#define BOOST_MOVE_IS_TRIVIALLY_DEFAULT_CONSTRUCTIBLE(T) ::boost::move_detail::is_pod<T>::value
#endif
#ifdef BOOST_MOVE_HAS_TRIVIAL_COPY
#define BOOST_MOVE_IS_TRIVIALLY_COPY_CONSTRUCTIBLE(T) BOOST_MOVE_HAS_TRIVIAL_COPY(T)
#else
#define BOOST_MOVE_IS_TRIVIALLY_COPY_CONSTRUCTIBLE(T) ::boost::move_detail::is_pod<T>::value
#endif
#ifdef BOOST_MOVE_HAS_TRIVIAL_MOVE_CONSTRUCTOR
#define BOOST_MOVE_IS_TRIVIALLY_MOVE_CONSTRUCTIBLE(T) BOOST_MOVE_HAS_TRIVIAL_MOVE_CONSTRUCTOR(T)
#else
#define BOOST_MOVE_IS_TRIVIALLY_MOVE_CONSTRUCTIBLE(T) ::boost::move_detail::is_pod<T>::value
#endif
#ifdef BOOST_MOVE_HAS_TRIVIAL_ASSIGN
#define BOOST_MOVE_IS_TRIVIALLY_COPY_ASSIGNABLE(T) BOOST_MOVE_HAS_TRIVIAL_ASSIGN(T)
#else
#define BOOST_MOVE_IS_TRIVIALLY_COPY_ASSIGNABLE(T) ::boost::move_detail::is_pod<T>::value
#endif
#ifdef BOOST_MOVE_HAS_TRIVIAL_MOVE_ASSIGN
#define BOOST_MOVE_IS_TRIVIALLY_MOVE_ASSIGNABLE(T) BOOST_MOVE_HAS_TRIVIAL_MOVE_ASSIGN(T)
#else
#define BOOST_MOVE_IS_TRIVIALLY_MOVE_ASSIGNABLE(T) ::boost::move_detail::is_pod<T>::value
#endif
#ifdef BOOST_MOVE_HAS_TRIVIAL_DESTRUCTOR
#define BOOST_MOVE_IS_TRIVIALLY_DESTRUCTIBLE(T) BOOST_MOVE_HAS_TRIVIAL_DESTRUCTOR(T)
#else
#define BOOST_MOVE_IS_TRIVIALLY_DESTRUCTIBLE(T) ::boost::move_detail::is_pod<T>::value
#endif
#ifdef BOOST_MOVE_HAS_NOTHROW_CONSTRUCTOR
#define BOOST_MOVE_IS_NOTHROW_DEFAULT_CONSTRUCTIBLE(T) BOOST_MOVE_HAS_NOTHROW_CONSTRUCTOR(T)
#else
#define BOOST_MOVE_IS_NOTHROW_DEFAULT_CONSTRUCTIBLE(T) ::boost::move_detail::is_pod<T>::value
#endif
#ifdef BOOST_MOVE_HAS_NOTHROW_COPY
#define BOOST_MOVE_IS_NOTHROW_COPY_CONSTRUCTIBLE(T) BOOST_MOVE_HAS_NOTHROW_COPY(T)
#else
#define BOOST_MOVE_IS_NOTHROW_COPY_CONSTRUCTIBLE(T) ::boost::move_detail::is_pod<T>::value
#endif
#ifdef BOOST_MOVE_HAS_NOTHROW_MOVE
#define BOOST_MOVE_IS_NOTHROW_MOVE_CONSTRUCTIBLE(T) BOOST_MOVE_HAS_NOTHROW_MOVE(T)
#else
#define BOOST_MOVE_IS_NOTHROW_MOVE_CONSTRUCTIBLE(T) ::boost::move_detail::is_pod<T>::value
#endif
#ifdef BOOST_MOVE_HAS_NOTHROW_ASSIGN
#define BOOST_MOVE_IS_NOTHROW_COPY_ASSIGNABLE(T) BOOST_MOVE_HAS_NOTHROW_ASSIGN(T)
#else
#define BOOST_MOVE_IS_NOTHROW_COPY_ASSIGNABLE(T) ::boost::move_detail::is_pod<T>::value
#endif
#ifdef BOOST_MOVE_HAS_NOTHROW_MOVE_ASSIGN
#define BOOST_MOVE_IS_NOTHROW_MOVE_ASSIGNABLE(T) BOOST_MOVE_HAS_NOTHROW_MOVE_ASSIGN(T)
#else
#define BOOST_MOVE_IS_NOTHROW_MOVE_ASSIGNABLE(T) ::boost::move_detail::is_pod<T>::value
#endif
#ifdef BOOST_MOVE_IS_ENUM
#define BOOST_MOVE_IS_ENUM_IMPL(T) BOOST_MOVE_IS_ENUM(T)
#else
#define BOOST_MOVE_IS_ENUM_IMPL(T) ::boost::move_detail::is_enum_nonintrinsic<T>::value
#endif
namespace boost {
namespace move_detail {
//////////////////////////
// is_reference
//////////////////////////
template<class T>
struct is_reference
{ static const bool value = false; };
template<class T>
struct is_reference<T&>
{ static const bool value = true; };
#if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
template<class T>
struct is_reference<T&&>
{ static const bool value = true; };
#endif
//////////////////////////
// is_pointer
//////////////////////////
template<class T>
struct is_pointer
{ static const bool value = false; };
template<class T>
struct is_pointer<T*>
{ static const bool value = true; };
//////////////////////////
// is_const
//////////////////////////
template<class T>
struct is_const
{ static const bool value = false; };
template<class T>
struct is_const<const T>
{ static const bool value = true; };
//////////////////////////
// unvoid_ref
//////////////////////////
template <typename T> struct unvoid_ref : add_lvalue_reference<T>{};
template <> struct unvoid_ref<void> { typedef unvoid_ref & type; };
template <> struct unvoid_ref<const void> { typedef unvoid_ref & type; };
template <> struct unvoid_ref<volatile void> { typedef unvoid_ref & type; };
template <> struct unvoid_ref<const volatile void> { typedef unvoid_ref & type; };
template <typename T>
struct add_reference : add_lvalue_reference<T>
{};
//////////////////////////
// add_const_reference
//////////////////////////
template <class T>
struct add_const_reference
{ typedef const T &type; };
template <class T>
struct add_const_reference<T&>
{ typedef T& type; };
//////////////////////////
// add_const_if_c
//////////////////////////
template<class T, bool Add>
struct add_const_if_c
: if_c<Add, typename add_const<T>::type, T>
{};
//////////////////////////
// remove_const
//////////////////////////
template<class T>
struct remove_const
{ typedef T type; };
template<class T>
struct remove_const< const T>
{ typedef T type; };
//////////////////////////
// remove_cv
//////////////////////////
template<typename T> struct remove_cv { typedef T type; };
template<typename T> struct remove_cv<const T> { typedef T type; };
template<typename T> struct remove_cv<const volatile T> { typedef T type; };
template<typename T> struct remove_cv<volatile T> { typedef T type; };
//////////////////////////
// make_unsigned
//////////////////////////
template <class T>
struct make_unsigned_impl { typedef T type; };
template <> struct make_unsigned_impl<signed char> { typedef unsigned char type; };
template <> struct make_unsigned_impl<signed short> { typedef unsigned short type; };
template <> struct make_unsigned_impl<signed int> { typedef unsigned int type; };
template <> struct make_unsigned_impl<signed long> { typedef unsigned long type; };
#ifdef BOOST_HAS_LONG_LONG
template <> struct make_unsigned_impl< ::boost::long_long_type > { typedef ::boost::ulong_long_type type; };
#endif
template <class T>
struct make_unsigned
: make_unsigned_impl<typename remove_cv<T>::type>
{};
//////////////////////////
// is_floating_point
//////////////////////////
template<class T> struct is_floating_point_cv { static const bool value = false; };
template<> struct is_floating_point_cv<float> { static const bool value = true; };
template<> struct is_floating_point_cv<double> { static const bool value = true; };
template<> struct is_floating_point_cv<long double> { static const bool value = true; };
template<class T>
struct is_floating_point
: is_floating_point_cv<typename remove_cv<T>::type>
{};
//////////////////////////
// is_integral
//////////////////////////
template<class T> struct is_integral_cv { static const bool value = false; };
template<> struct is_integral_cv< bool>{ static const bool value = true; };
template<> struct is_integral_cv< char>{ static const bool value = true; };
template<> struct is_integral_cv< unsigned char>{ static const bool value = true; };
template<> struct is_integral_cv< signed char>{ static const bool value = true; };
#ifndef BOOST_NO_CXX11_CHAR16_T
template<> struct is_integral_cv< char16_t>{ static const bool value = true; };
#endif
#ifndef BOOST_NO_CXX11_CHAR32_T
template<> struct is_integral_cv< char32_t>{ static const bool value = true; };
#endif
#ifndef BOOST_NO_INTRINSIC_WCHAR_T
template<> struct is_integral_cv< wchar_t>{ static const bool value = true; };
#endif
template<> struct is_integral_cv< short>{ static const bool value = true; };
template<> struct is_integral_cv< unsigned short>{ static const bool value = true; };
template<> struct is_integral_cv< int>{ static const bool value = true; };
template<> struct is_integral_cv< unsigned int>{ static const bool value = true; };
template<> struct is_integral_cv< long>{ static const bool value = true; };
template<> struct is_integral_cv< unsigned long>{ static const bool value = true; };
#ifdef BOOST_HAS_LONG_LONG
template<> struct is_integral_cv< ::boost:: long_long_type>{ static const bool value = true; };
template<> struct is_integral_cv< ::boost::ulong_long_type>{ static const bool value = true; };
#endif
template<class T>
struct is_integral
: public is_integral_cv<typename remove_cv<T>::type>
{};
//////////////////////////////////////
// remove_all_extents
//////////////////////////////////////
template <class T>
struct remove_all_extents
{ typedef T type;};
template <class T>
struct remove_all_extents<T[]>
{ typedef typename remove_all_extents<T>::type type; };
template <class T, std::size_t N>
struct remove_all_extents<T[N]>
{ typedef typename remove_all_extents<T>::type type;};
//////////////////////////
// is_scalar
//////////////////////////
template<class T>
struct is_scalar
{ static const bool value = is_integral<T>::value || is_floating_point<T>::value; };
//////////////////////////
// is_void
//////////////////////////
template<class T>
struct is_void_cv
{ static const bool value = false; };
template<>
struct is_void_cv<void>
{ static const bool value = true; };
template<class T>
struct is_void
: is_void_cv<typename remove_cv<T>::type>
{};
//////////////////////////////////////
// is_array
//////////////////////////////////////
template<class T>
struct is_array
{ static const bool value = false; };
template<class T>
struct is_array<T[]>
{ static const bool value = true; };
template<class T, std::size_t N>
struct is_array<T[N]>
{ static const bool value = true; };
//////////////////////////////////////
// is_member_pointer
//////////////////////////////////////
template <class T> struct is_member_pointer_cv { static const bool value = false; };
template <class T, class U>struct is_member_pointer_cv<T U::*> { static const bool value = true; };
template <class T>
struct is_member_pointer
: is_member_pointer_cv<typename remove_cv<T>::type>
{};
//////////////////////////////////////
// is_nullptr_t
//////////////////////////////////////
template <class T>
struct is_nullptr_t_cv
{ static const bool value = false; };
#if !defined(BOOST_NO_CXX11_NULLPTR)
template <>
struct is_nullptr_t_cv
#if !defined(BOOST_NO_CXX11_DECLTYPE)
<decltype(nullptr)>
#else
<std::nullptr_t>
#endif
{ static const bool value = true; };
#endif
template <class T>
struct is_nullptr_t
: is_nullptr_t_cv<typename remove_cv<T>::type>
{};
//////////////////////////////////////
// is_function
//////////////////////////////////////
//Inspired by libc++, thanks to Howard Hinnant
//For a function to pointer an lvalue of function type T can be implicitly converted to a prvalue
//pointer to that function. This does not apply to non-static member functions because lvalues
//that refer to non-static member functions do not exist.
template <class T>
struct is_reference_convertible_to_pointer
{
struct twochar { char dummy[2]; };
template <class U> static char test(U*);
template <class U> static twochar test(...);
static T& source();
static const bool value = sizeof(char) == sizeof(test<T>(source()));
};
//Filter out:
// - class types that might have implicit conversions
// - void (to avoid forming a reference to void later)
// - references (e.g.: filtering reference to functions)
// - nullptr_t (convertible to pointer)
template < class T
, bool Filter = is_class_or_union<T>::value ||
is_void<T>::value ||
is_reference<T>::value ||
is_nullptr_t<T>::value >
struct is_function_impl
{ static const bool value = is_reference_convertible_to_pointer<T>::value; };
template <class T>
struct is_function_impl<T, true>
{ static const bool value = false; };
template <class T>
struct is_function
: is_function_impl<T>
{};
//////////////////////////////////////
// is_union
//////////////////////////////////////
template<class T>
struct is_union_noextents_cv
{ static const bool value = BOOST_MOVE_IS_UNION_IMPL(T); };
template<class T>
struct is_union
: is_union_noextents_cv<typename remove_cv<typename remove_all_extents<T>::type>::type>
{};
//////////////////////////////////////
// is_class
//////////////////////////////////////
template <class T>
struct is_class
{
static const bool value = is_class_or_union<T>::value && ! is_union<T>::value;
};
//////////////////////////////////////
// is_arithmetic
//////////////////////////////////////
template <class T>
struct is_arithmetic
{
static const bool value = is_floating_point<T>::value ||
is_integral<T>::value;
};
//////////////////////////////////////
// is_member_function_pointer
//////////////////////////////////////
template <class T>
struct is_member_function_pointer_cv
{
static const bool value = false;
};
template <class T, class C>
struct is_member_function_pointer_cv<T C::*>
: is_function<T>
{};
template <class T>
struct is_member_function_pointer
: is_member_function_pointer_cv<typename remove_cv<T>::type>
{};
//////////////////////////////////////
// is_enum
//////////////////////////////////////
#if !defined(BOOST_MOVE_IS_ENUM)
//Based on (http://howardhinnant.github.io/TypeHiearchy.pdf)
template <class T>
struct is_enum_nonintrinsic
{
static const bool value = !is_arithmetic<T>::value &&
!is_reference<T>::value &&
!is_class_or_union<T>::value &&
!is_array<T>::value &&
!is_void<T>::value &&
!is_nullptr_t<T>::value &&
!is_member_pointer<T>::value &&
!is_pointer<T>::value &&
!is_function<T>::value;
};
#endif
template <class T>
struct is_enum
{ static const bool value = BOOST_MOVE_IS_ENUM_IMPL(T); };
//////////////////////////////////////
// is_pod
//////////////////////////////////////
template<class T>
struct is_pod_noextents_cv //for non-c++11 compilers, a safe fallback
{ static const bool value = BOOST_MOVE_IS_POD_IMPL(T); };
template<class T>
struct is_pod
: is_pod_noextents_cv<typename remove_cv<typename remove_all_extents<T>::type>::type>
{};
//////////////////////////////////////
// is_empty
//////////////////////////////////////
#if !defined(BOOST_MOVE_IS_EMPTY)
template <typename T>
struct empty_helper_t1 : public T
{
empty_helper_t1(); // hh compiler bug workaround
int i[256];
private:
empty_helper_t1(const empty_helper_t1&);
empty_helper_t1& operator=(const empty_helper_t1&);
};
struct empty_helper_t2 { int i[256]; };
template <typename T, bool IsClass = is_class<T>::value >
struct is_empty_nonintrinsic
{
static const bool value = false;
};
template <typename T>
struct is_empty_nonintrinsic<T, true>
{
static const bool value = sizeof(empty_helper_t1<T>) == sizeof(empty_helper_t2);
};
#endif
template <class T>
struct is_empty
{ static const bool value = BOOST_MOVE_IS_EMPTY_IMPL(T); };
template<class T>
struct has_boost_move_no_copy_constructor_or_assign_type
{
template <class U>
static yes_type test(typename U::boost_move_no_copy_constructor_or_assign*);
template <class U>
static no_type test(...);
static const bool value = sizeof(test<T>(0)) == sizeof(yes_type);
};
//////////////////////////////////////
// is_copy_constructible
//////////////////////////////////////
#if !defined(BOOST_NO_CXX11_DELETED_FUNCTIONS) && !defined(BOOST_NO_CXX11_DECLTYPE) \
&& !defined(BOOST_INTEL_CXX_VERSION) && \
!(defined(BOOST_MSVC) && _MSC_VER == 1800)
#define BOOST_MOVE_TT_CXX11_IS_COPY_CONSTRUCTIBLE
#endif
template<class T>
struct is_copy_constructible
{
// Intel compiler has problems with SFINAE for copy constructors and deleted functions:
//
// error: function *function_name* cannot be referenced -- it is a deleted function
// static yes_type test(U&, decltype(U(boost::declval<U&>()))* = 0);
// ^
// MSVC 12.0 (Visual 2013) has problems when the copy constructor has been deleted. See:
// https://connect.microsoft.com/VisualStudio/feedback/details/800328/std-is-copy-constructible-is-broken
#if defined(BOOST_MOVE_TT_CXX11_IS_COPY_CONSTRUCTIBLE)
template<class U> static typename add_reference<U>::type source();
static no_type test(...);
#ifdef BOOST_NO_CXX11_DECLTYPE
template <class U>
static yes_type test(U&, bool_<sizeof(U(source<U>()))>* = 0);
#else
template <class U>
static yes_type test(U&, decltype(U(source<U>()))* = 0);
#endif
static const bool value = sizeof(test(source<T>())) == sizeof(yes_type);
#else
static const bool value = !has_boost_move_no_copy_constructor_or_assign_type<T>::value;
#endif
};
//////////////////////////////////////
// is_copy_assignable
//////////////////////////////////////
#if !defined(BOOST_NO_CXX11_DELETED_FUNCTIONS) && !defined(BOOST_NO_CXX11_DECLTYPE) \
&& !defined(BOOST_INTEL_CXX_VERSION) && \
!(defined(BOOST_MSVC) && _MSC_VER == 1800)
#define BOOST_MOVE_TT_CXX11_IS_COPY_ASSIGNABLE
#endif
template <class T>
struct is_copy_assignable
{
// Intel compiler has problems with SFINAE for copy constructors and deleted functions:
//
// error: function *function_name* cannot be referenced -- it is a deleted function
// static boost::type_traits::yes_type test(T1&, decltype(T1(boost::declval<T1&>()))* = 0);
// ^
//
// MSVC 12.0 (Visual 2013) has problems when the copy constructor has been deleted. See:
// https://connect.microsoft.com/VisualStudio/feedback/details/800328/std-is-copy-constructible-is-broken
#if defined(BOOST_MOVE_TT_CXX11_IS_COPY_ASSIGNABLE)
typedef char yes_type;
struct no_type { char dummy[2]; };
template <class U> static typename add_reference<U>::type source();
template <class U> static decltype(source<U&>() = source<const U&>(), yes_type() ) test(int);
template <class> static no_type test(...);
static const bool value = sizeof(test<T>(0)) == sizeof(yes_type);
#else
static const bool value = !has_boost_move_no_copy_constructor_or_assign_type<T>::value;
#endif
};
//////////////////////////////////////
// is_trivially_destructible
//////////////////////////////////////
template<class T>
struct is_trivially_destructible
{ static const bool value = BOOST_MOVE_IS_TRIVIALLY_DESTRUCTIBLE(T); };
//////////////////////////////////////
// is_trivially_default_constructible
//////////////////////////////////////
template<class T>
struct is_trivially_default_constructible
{ static const bool value = BOOST_MOVE_IS_TRIVIALLY_DEFAULT_CONSTRUCTIBLE(T); };
//////////////////////////////////////
// is_trivially_copy_constructible
//////////////////////////////////////
template<class T>
struct is_trivially_copy_constructible
{
//In several compilers BOOST_MOVE_IS_TRIVIALLY_COPY_CONSTRUCTIBLE return true even with
//deleted copy constructors so make sure the type is copy constructible.
static const bool value = ::boost::move_detail::is_pod<T>::value ||
( ::boost::move_detail::is_copy_constructible<T>::value &&
BOOST_MOVE_IS_TRIVIALLY_COPY_CONSTRUCTIBLE(T) );
};
//////////////////////////////////////
// is_trivially_move_constructible
//////////////////////////////////////
template<class T>
struct is_trivially_move_constructible
{ static const bool value = BOOST_MOVE_IS_TRIVIALLY_MOVE_CONSTRUCTIBLE(T); };
//////////////////////////////////////
// is_trivially_copy_assignable
//////////////////////////////////////
template<class T>
struct is_trivially_copy_assignable
{
//In several compilers BOOST_MOVE_IS_TRIVIALLY_COPY_CONSTRUCTIBLE return true even with
//deleted copy constructors so make sure the type is copy constructible.
static const bool value = ::boost::move_detail::is_pod<T>::value ||
( ::boost::move_detail::is_copy_assignable<T>::value &&
BOOST_MOVE_IS_TRIVIALLY_COPY_ASSIGNABLE(T) );
};
//////////////////////////////////////
// is_trivially_move_assignable
//////////////////////////////////////
template<class T>
struct is_trivially_move_assignable
{ static const bool value = BOOST_MOVE_IS_TRIVIALLY_MOVE_ASSIGNABLE(T); };
//////////////////////////////////////
// is_nothrow_default_constructible
//////////////////////////////////////
template<class T>
struct is_nothrow_default_constructible
: is_pod<T>
{ static const bool value = BOOST_MOVE_IS_NOTHROW_DEFAULT_CONSTRUCTIBLE(T); };
//////////////////////////////////////
// is_nothrow_copy_constructible
//////////////////////////////////////
template<class T>
struct is_nothrow_copy_constructible
{ static const bool value = BOOST_MOVE_IS_NOTHROW_COPY_CONSTRUCTIBLE(T); };
//////////////////////////////////////
// is_nothrow_move_constructible
//////////////////////////////////////
template<class T>
struct is_nothrow_move_constructible
{ static const bool value = BOOST_MOVE_IS_NOTHROW_MOVE_CONSTRUCTIBLE(T); };
//////////////////////////////////////
// is_nothrow_copy_assignable
//////////////////////////////////////
template<class T>
struct is_nothrow_copy_assignable
{ static const bool value = BOOST_MOVE_IS_NOTHROW_COPY_ASSIGNABLE(T); };
//////////////////////////////////////
// is_nothrow_move_assignable
//////////////////////////////////////
template<class T>
struct is_nothrow_move_assignable
{ static const bool value = BOOST_MOVE_IS_NOTHROW_MOVE_ASSIGNABLE(T); };
//////////////////////////////////////
// is_nothrow_swappable
//////////////////////////////////////
template<class T>
struct is_nothrow_swappable
{
static const bool value = is_empty<T>::value || is_pod<T>::value;
};
//////////////////////////////////////
// alignment_of
//////////////////////////////////////
template <typename T>
struct alignment_of_hack
{
T t1;
char c;
T t2;
alignment_of_hack();
};
template <unsigned A, unsigned S>
struct alignment_logic
{ static const std::size_t value = A < S ? A : S; };
template< typename T >
struct alignment_of_impl
#if defined(BOOST_MSVC) && (BOOST_MSVC >= 1400)
// With MSVC both the native __alignof operator
// and our own logic gets things wrong from time to time :-(
// Using a combination of the two seems to make the most of a bad job:
: alignment_logic< sizeof(alignment_of_hack<T>) - 2*sizeof(T), __alignof(T)>
{};
#elif !defined(BOOST_MOVE_ALIGNMENT_OF)
: alignment_logic< sizeof(alignment_of_hack<T>) - 2*sizeof(T), sizeof(T)>
{};
#else
{ static const std::size_t value = BOOST_MOVE_ALIGNMENT_OF(T); };
#endif
template< typename T >
struct alignment_of
: alignment_of_impl<T>
{};
class alignment_dummy;
typedef void (*function_ptr)();
typedef int (alignment_dummy::*member_ptr);
typedef int (alignment_dummy::*member_function_ptr)();
struct alignment_struct
{ long double dummy[4]; };
/////////////////////////////
// max_align_t
/////////////////////////////
//This is not standard, but should work with all compilers
union max_align
{
char char_;
short short_;
int int_;
long long_;
#ifdef BOOST_HAS_LONG_LONG
::boost::long_long_type long_long_;
#endif
float float_;
double double_;
void * void_ptr_;
long double long_double_[4];
alignment_dummy *unknown_class_ptr_;
function_ptr function_ptr_;
member_function_ptr member_function_ptr_;
alignment_struct alignment_struct_;
};
typedef union max_align max_align_t;
/////////////////////////////
// aligned_storage
/////////////////////////////
#if !defined(BOOST_NO_ALIGNMENT)
template<std::size_t Len, std::size_t Align>
struct aligned_storage_impl;
#define BOOST_MOVE_ALIGNED_STORAGE_WITH_BOOST_ALIGNMENT(A)\
template<std::size_t Len>\
struct BOOST_ALIGNMENT(A) aligned_storage_impl<Len, A>\
{\
char dummy[Len];\
typedef aligned_storage_impl<Len, A> type;\
};\
//
//Up to 4K alignment (typical page size)
BOOST_MOVE_ALIGNED_STORAGE_WITH_BOOST_ALIGNMENT(0x1)
BOOST_MOVE_ALIGNED_STORAGE_WITH_BOOST_ALIGNMENT(0x2)
BOOST_MOVE_ALIGNED_STORAGE_WITH_BOOST_ALIGNMENT(0x4)
BOOST_MOVE_ALIGNED_STORAGE_WITH_BOOST_ALIGNMENT(0x8)
BOOST_MOVE_ALIGNED_STORAGE_WITH_BOOST_ALIGNMENT(0x10)
BOOST_MOVE_ALIGNED_STORAGE_WITH_BOOST_ALIGNMENT(0x20)
BOOST_MOVE_ALIGNED_STORAGE_WITH_BOOST_ALIGNMENT(0x40)
BOOST_MOVE_ALIGNED_STORAGE_WITH_BOOST_ALIGNMENT(0x80)
BOOST_MOVE_ALIGNED_STORAGE_WITH_BOOST_ALIGNMENT(0x100)
BOOST_MOVE_ALIGNED_STORAGE_WITH_BOOST_ALIGNMENT(0x200)
BOOST_MOVE_ALIGNED_STORAGE_WITH_BOOST_ALIGNMENT(0x400)
BOOST_MOVE_ALIGNED_STORAGE_WITH_BOOST_ALIGNMENT(0x800)
BOOST_MOVE_ALIGNED_STORAGE_WITH_BOOST_ALIGNMENT(0x1000)