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Revert "Rework fix for PR19460 - Use explicit bool as an extension instead."

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This reverts commit 3a1b90a866.

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@291921 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Eric Fiselier
2017-01-13 18:03:46 +00:00
parent c4d3afdfad
commit 1a147b7d64
3 changed files with 19 additions and 7 deletions
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2
include/__config
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@@ -772,7 +772,7 @@ template <unsigned> struct __static_assert_check {};
#define _NOALIAS
#endif
#if __has_extension(cxx_explicit_conversions) || defined(__IBMCPP__) || \
#if __has_feature(cxx_explicit_conversions) || defined(__IBMCPP__) || \
(!defined(_LIBCPP_CXX03_LANG) && defined(__GNUC__)) // All supported GCC versions
# define _LIBCPP_EXPLICIT explicit
#else

7
include/experimental/string_view
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@@ -340,12 +340,7 @@ _LIBCPP_BEGIN_NAMESPACE_LFTS
// [string.view.ops], string operations:
template<class _Allocator>
_LIBCPP_INLINE_VISIBILITY
// Clang's extended C++11 explict conversions don't work with
// string_view in C++03.
#ifndef _LIBCPP_CXX03_LANG
_LIBCPP_EXPLICIT
#endif
operator basic_string<_CharT, _Traits, _Allocator>() const
_LIBCPP_EXPLICIT operator basic_string<_CharT, _Traits, _Allocator>() const
{ return basic_string<_CharT, _Traits, _Allocator>( begin(), end()); }
template<class _Allocator = allocator<_CharT> >

17
include/ios
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@@ -572,6 +572,13 @@ ios_base::exceptions(iostate __iostate)
clear(__rdstate_);
}
#if defined(_LIBCPP_CXX03_LANG)
struct _LIBCPP_TYPE_VIS_ONLY __cxx03_bool {
typedef void (__cxx03_bool::*__bool_type)();
void __true_value() {}
};
#endif
template <class _CharT, class _Traits>
class _LIBCPP_TEMPLATE_VIS basic_ios
: public ios_base
@@ -585,8 +592,18 @@ public:
typedef typename traits_type::pos_type pos_type;
typedef typename traits_type::off_type off_type;
// __true_value will generate undefined references when linking unless
// we give it internal linkage.
#if defined(_LIBCPP_CXX03_LANG)
_LIBCPP_ALWAYS_INLINE
operator __cxx03_bool::__bool_type() const {
return !fail() ? &__cxx03_bool::__true_value : nullptr;
}
#else
_LIBCPP_ALWAYS_INLINE
_LIBCPP_EXPLICIT operator bool() const {return !fail();}
#endif
_LIBCPP_ALWAYS_INLINE bool operator!() const {return fail();}
_LIBCPP_ALWAYS_INLINE iostate rdstate() const {return ios_base::rdstate();}