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- Reworked some traits to refactor code

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- is_trivially_copy_xxxxable updated to add is_pod
- Updated is_pod adding scalar and void as some compilers' __is_pod intrinsic doesn't work with scalars
- Added test for type_traits. Only a few tested, more to come.
This commit is contained in:
Ion Gaztañaga
2015-04-26 23:29:27 +02:00
parent 32f4d91cec
commit 69598a3d3f
5 changed files with 299 additions and 41 deletions
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include/boost/move/detail/type_traits.hpp
+35 -23
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@@ -219,7 +219,10 @@
#endif
#ifdef BOOST_MOVE_IS_POD
#define BOOST_MOVE_IS_POD_IMPL(T) BOOST_MOVE_IS_POD(T)
//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)
@@ -702,16 +705,31 @@ 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
{
typedef char yes_type;
struct no_type { char dummy[2]; };
template<class U> static typename add_reference<U>::type source();
// Intel compiler has problems with SFINAE for copy constructors and deleted functions:
//
// error: function *function_name* cannot be referenced -- it is a deleted function
@@ -719,8 +737,8 @@ struct is_copy_constructible
// ^
// 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_NO_CXX11_DELETED_FUNCTIONS) && !defined(BOOST_INTEL_CXX_VERSION) &&\
!(defined(BOOST_MSVC) && _MSC_VER == 1800)
#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>
@@ -729,15 +747,13 @@ struct is_copy_constructible
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
template <class U>
static no_type test(U&, typename U::boost_move_no_copy_constructor_or_assign* = 0);
static yes_type test(...);
static const bool value = !has_boost_move_no_copy_constructor_or_assign_type<T>::value;
#endif
static const bool value = sizeof(test(source<T>())) == sizeof(yes_type);
};
//////////////////////////////////////
// is_copy_assignable
//////////////////////////////////////
@@ -768,13 +784,7 @@ struct is_copy_assignable
static const bool value = sizeof(test<T>(0)) == sizeof(yes_type);
#else
static typename add_reference<T>::type produce();
template <class T1>
static no_type test(T1&, typename T1::boost_move_no_copy_constructor_or_assign* = 0);
static yes_type test(...);
static const bool value = sizeof(test(produce())) == sizeof(yes_type);
static const bool value = !has_boost_move_no_copy_constructor_or_assign_type<T>::value;
#endif
};
@@ -800,8 +810,9 @@ 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_copy_constructible<T>::value &&
BOOST_MOVE_IS_TRIVIALLY_COPY_CONSTRUCTIBLE(T);
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) );
};
//////////////////////////////////////
@@ -819,8 +830,9 @@ 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_copy_assignable<T>::value &&
BOOST_MOVE_IS_TRIVIALLY_COPY_ASSIGNABLE(T);
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) );
};
//////////////////////////////////////