Revert "Rework fix for PR19460 - Use explicit bool as an extension instead." This reverts commit 3a1b90a866b6d5d62a5f37fbfb3a1ee36cc70dd1. git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@291921 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/include/ios b/include/ios index efee39f..b05ee4c 100644 --- a/include/ios +++ b/include/ios
@@ -572,6 +572,13 @@ 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 @@ 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();} 