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Redid nothrow traits in terms of non-nothrow traits when noexcept is available

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git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@131198 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Howard Hinnant 2011-05-11 20:19:40 +00:00
parent 3666695f0d
commit 5d37fb32d2
2 changed files with 97 additions and 6 deletions
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15
include/__config
View File

@ -86,8 +86,9 @@
#if defined(__clang__)
#define _LIBCPP_HAS_NO_ADVANCED_SFINAE
//#if !__has_feature(cxx_alias_templates)
#define _LIBCPP_HAS_NO_TEMPLATE_ALIASES
//#endif
#ifndef __GXX_EXPERIMENTAL_CXX0X__
#ifdef __linux__
@ -138,6 +139,7 @@ typedef __char32_t char32_t;
#if !(__has_feature(cxx_auto_type))
#define _LIBCPP_HAS_NO_AUTO_TYPE
#define _LIBCPP_HAS_NO_ADVANCED_SFINAE
#endif
#if !(__has_feature(cxx_variadic_templates))
@ -162,6 +164,14 @@ namespace std {
#define _LIBCPP_HAS_NO_CONSTEXPR
#endif
#if (__has_feature(cxx_noexcept))
# define _NOEXCEPT noexcept
# define _NOEXCEPT_(x) noexcept(x)
#else
# define _NOEXCEPT throw()
# define _NOEXCEPT_(x)
#endif
// end defined(__clang__)
#elif defined(__GNUC__)
@ -173,6 +183,9 @@ namespace std {
#define _LIBCPP_HAS_NO_TEMPLATE_ALIASES
#define _LIBCPP_HAS_NO_CONSTEXPR
#define _NOEXCEPT throw()
#define _NOEXCEPT_(x)
#ifndef __GXX_EXPERIMENTAL_CXX0X__
#define _LIBCPP_HAS_NO_ADVANCED_SFINAE

88
include/type_traits
View File

@ -490,7 +490,7 @@ template <> struct _LIBCPP_VISIBLE add_rvalue_reference<const volatile
template <class _Tp>
typename add_rvalue_reference<_Tp>::type
declval();
declval() _NOEXCEPT;
#else // _LIBCPP_HAS_NO_RVALUE_REFERENCES
@ -2121,6 +2121,30 @@ template <class _Tp> struct _LIBCPP_VISIBLE is_trivially_destructible
#ifndef _LIBCPP_HAS_NO_VARIADICS
#if __has_feature(cxx_noexcept)
template <bool, class _Tp, class... _Args> struct __is_nothrow_constructible;
template <class _Tp, class... _Args>
struct __is_nothrow_constructible<true, _Tp, _Args...>
: public integral_constant<bool, noexcept(_Tp(declval<_Args>()...))>
{
};
template <class _Tp, class... _Args>
struct __is_nothrow_constructible<false, _Tp, _Args...>
: public false_type
{
};
template <class _Tp, class... _Args>
struct _LIBCPP_VISIBLE is_nothrow_constructible
: __is_nothrow_constructible<is_constructible<_Tp, _Args...>::value, _Tp, _Args...>
{
};
#else // __has_feature(cxx_noexcept)
template <class _Tp, class... _Args>
struct _LIBCPP_VISIBLE is_nothrow_constructible
: false_type
@ -2171,6 +2195,8 @@ struct _LIBCPP_VISIBLE is_nothrow_constructible<_Tp, _Tp&>
{
};
#endif // __has_feature(cxx_noexcept)
#else // _LIBCPP_HAS_NO_VARIADICS
template <class _Tp, class _A0 = __is_construct::__nat,
@ -2250,12 +2276,36 @@ template <class _Tp> struct _LIBCPP_VISIBLE is_nothrow_move_constructible
// is_nothrow_assignable
#if __has_feature(cxx_noexcept)
template <bool, class _Tp, class _Arg> struct __is_nothrow_assignable;
template <class _Tp, class _Arg>
struct is_nothrow_assignable
struct __is_nothrow_assignable<false, _Tp, _Arg>
: public false_type
{
};
template <class _Tp, class _Arg>
struct __is_nothrow_assignable<true, _Tp, _Arg>
: public integral_constant<bool, noexcept(_STD::declval<_Tp>() = _STD::declval<_Arg>()) >
{
};
template <class _Tp, class _Arg>
struct _LIBCPP_VISIBLE is_nothrow_assignable
: public __is_nothrow_assignable<is_assignable<_Tp, _Arg>::value, _Tp, _Arg>
{
};
#else // __has_feature(cxx_noexcept)
template <class _Tp, class _Arg>
struct _LIBCPP_VISIBLE is_nothrow_assignable
: public false_type {};
template <class _Tp>
struct is_nothrow_assignable<_Tp&, _Tp>
struct _LIBCPP_VISIBLE is_nothrow_assignable<_Tp&, _Tp>
#if __has_feature(has_nothrow_assign) || (__GNUC__ > 4) || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3)
: integral_constant<bool, __has_nothrow_assign(_Tp)> {};
#else
@ -2263,7 +2313,7 @@ struct is_nothrow_assignable<_Tp&, _Tp>
#endif
template <class _Tp>
struct is_nothrow_assignable<_Tp&, _Tp&>
struct _LIBCPP_VISIBLE is_nothrow_assignable<_Tp&, _Tp&>
#if __has_feature(has_nothrow_assign) || (__GNUC__ > 4) || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3)
: integral_constant<bool, __has_nothrow_assign(_Tp)> {};
#else
@ -2271,7 +2321,7 @@ struct is_nothrow_assignable<_Tp&, _Tp&>
#endif
template <class _Tp>
struct is_nothrow_assignable<_Tp&, const _Tp&>
struct _LIBCPP_VISIBLE is_nothrow_assignable<_Tp&, const _Tp&>
#if __has_feature(has_nothrow_assign) || (__GNUC__ > 4) || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3)
: integral_constant<bool, __has_nothrow_assign(_Tp)> {};
#else
@ -2290,6 +2340,8 @@ struct is_nothrow_assignable<_Tp&, _Tp&&>
#endif // _LIBCPP_HAS_NO_RVALUE_REFERENCES
#endif // __has_feature(cxx_noexcept)
// is_nothrow_copy_assignable
template <class _Tp> struct _LIBCPP_VISIBLE is_nothrow_copy_assignable
@ -2310,6 +2362,30 @@ template <class _Tp> struct _LIBCPP_VISIBLE is_nothrow_move_assignable
// is_nothrow_destructible
#if __has_feature(cxx_noexcept)
template <bool, class _Tp> struct __is_nothrow_destructible;
template <class _Tp>
struct __is_nothrow_destructible<false, _Tp>
: public false_type
{
};
template <class _Tp>
struct __is_nothrow_destructible<true, _Tp>
: public integral_constant<bool, noexcept(_STD::declval<_Tp>().~_Tp()) >
{
};
template <class _Tp>
struct _LIBCPP_VISIBLE is_nothrow_destructible
: public __is_nothrow_destructible<is_destructible<_Tp>::value, _Tp>
{
};
#else
template <class _Tp> struct __libcpp_nothrow_destructor
: public integral_constant<bool, is_scalar<_Tp>::value ||
is_reference<_Tp>::value> {};
@ -2317,6 +2393,8 @@ template <class _Tp> struct __libcpp_nothrow_destructor
template <class _Tp> struct _LIBCPP_VISIBLE is_nothrow_destructible
: public __libcpp_nothrow_destructor<typename remove_all_extents<_Tp>::type> {};
#endif
// is_pod
#if __has_feature(is_pod) || (__GNUC__ > 4) || (__GNUC__ == 4 && __GNUC_MINOR__ >= 3)