[libc++] Use the using_if_exists attribute when provided

As discussed on cfe-dev [1], use the using_if_exists Clang attribute when
the compiler supports it. This makes it easier to port libc++ on top of
new platforms that don't fully support the C Standard library.

Previously, libc++ would fail to build when trying to import a missing
declaration in a <cXXXX> header. With the attribute, the declaration will
simply not be imported into namespace std, and hence it won't be available
for libc++ to use. In many cases, the declarations were *not* actually
required for libc++ to work (they were only surfaced for users to use
them as std::XXXX), so not importing them into namespace std is acceptable.

The same thing could be achieved by conscious usage of `#ifdef` along
with platform detection, however that quickly creates a maintenance
problem as libc++ is ported to new platforms. Furthermore, this problem
is exacerbated when mixed with vendor internal-only platforms, which can
lead to difficulties maintaining a downstream fork of the library.

For the time being, we only use the using_if_exists attribute when it
is supported. At some point in the future, we will start removing #ifdef
paths that are unnecessary when the attribute is supported, and folks
who need those #ifdef paths will be required to use a compiler that
supports the attribute.

[1]: http://lists.llvm.org/pipermail/cfe-dev/2020-June/066038.html

Differential Revision: https://reviews.llvm.org/D90257
This commit is contained in:
Louis Dionne 2021-06-02 10:41:37 -04:00
parent 86c24493ea
commit a9c9183ca4
17 changed files with 482 additions and 476 deletions

View file

@ -880,6 +880,12 @@ typedef unsigned int char32_t;
# define _LIBCPP_EXPLICIT
#endif
#if __has_attribute(using_if_exists)
# define _LIBCPP_USING_IF_EXISTS __attribute__((using_if_exists))
#else
# define _LIBCPP_USING_IF_EXISTS
#endif
#ifdef _LIBCPP_HAS_NO_STRONG_ENUMS
# define _LIBCPP_DECLARE_STRONG_ENUM(x) struct _LIBCPP_TYPE_VIS x { enum __lx
# define _LIBCPP_DECLARE_STRONG_ENUM_EPILOG(x) \

View file

@ -100,20 +100,20 @@ _LIBCPP_BEGIN_NAMESPACE_STD
#endif
using ::isalnum;
using ::isalpha;
using ::isblank;
using ::iscntrl;
using ::isdigit;
using ::isgraph;
using ::islower;
using ::isprint;
using ::ispunct;
using ::isspace;
using ::isupper;
using ::isxdigit;
using ::tolower;
using ::toupper;
using ::isalnum _LIBCPP_USING_IF_EXISTS;
using ::isalpha _LIBCPP_USING_IF_EXISTS;
using ::isblank _LIBCPP_USING_IF_EXISTS;
using ::iscntrl _LIBCPP_USING_IF_EXISTS;
using ::isdigit _LIBCPP_USING_IF_EXISTS;
using ::isgraph _LIBCPP_USING_IF_EXISTS;
using ::islower _LIBCPP_USING_IF_EXISTS;
using ::isprint _LIBCPP_USING_IF_EXISTS;
using ::ispunct _LIBCPP_USING_IF_EXISTS;
using ::isspace _LIBCPP_USING_IF_EXISTS;
using ::isupper _LIBCPP_USING_IF_EXISTS;
using ::isxdigit _LIBCPP_USING_IF_EXISTS;
using ::tolower _LIBCPP_USING_IF_EXISTS;
using ::toupper _LIBCPP_USING_IF_EXISTS;
_LIBCPP_END_NAMESPACE_STD

View file

@ -61,20 +61,20 @@ int feupdateenv(const fenv_t* envp);
_LIBCPP_BEGIN_NAMESPACE_STD
using ::fenv_t;
using ::fexcept_t;
using ::fenv_t _LIBCPP_USING_IF_EXISTS;
using ::fexcept_t _LIBCPP_USING_IF_EXISTS;
using ::feclearexcept;
using ::fegetexceptflag;
using ::feraiseexcept;
using ::fesetexceptflag;
using ::fetestexcept;
using ::fegetround;
using ::fesetround;
using ::fegetenv;
using ::feholdexcept;
using ::fesetenv;
using ::feupdateenv;
using ::feclearexcept _LIBCPP_USING_IF_EXISTS;
using ::fegetexceptflag _LIBCPP_USING_IF_EXISTS;
using ::feraiseexcept _LIBCPP_USING_IF_EXISTS;
using ::fesetexceptflag _LIBCPP_USING_IF_EXISTS;
using ::fetestexcept _LIBCPP_USING_IF_EXISTS;
using ::fegetround _LIBCPP_USING_IF_EXISTS;
using ::fesetround _LIBCPP_USING_IF_EXISTS;
using ::fegetenv _LIBCPP_USING_IF_EXISTS;
using ::feholdexcept _LIBCPP_USING_IF_EXISTS;
using ::fesetenv _LIBCPP_USING_IF_EXISTS;
using ::feupdateenv _LIBCPP_USING_IF_EXISTS;
_LIBCPP_END_NAMESPACE_STD

View file

@ -244,13 +244,13 @@ uintmax_t wcstoumax(const wchar_t* restrict nptr, wchar_t** restrict endptr, int
_LIBCPP_BEGIN_NAMESPACE_STD
using::imaxdiv_t;
using::imaxabs;
using::imaxdiv;
using::strtoimax;
using::strtoumax;
using::wcstoimax;
using::wcstoumax;
using ::imaxdiv_t _LIBCPP_USING_IF_EXISTS;
using ::imaxabs _LIBCPP_USING_IF_EXISTS;
using ::imaxdiv _LIBCPP_USING_IF_EXISTS;
using ::strtoimax _LIBCPP_USING_IF_EXISTS;
using ::strtoumax _LIBCPP_USING_IF_EXISTS;
using ::wcstoimax _LIBCPP_USING_IF_EXISTS;
using ::wcstoumax _LIBCPP_USING_IF_EXISTS;
_LIBCPP_END_NAMESPACE_STD

View file

@ -43,11 +43,11 @@ lconv* localeconv();
_LIBCPP_BEGIN_NAMESPACE_STD
using ::lconv;
using ::lconv _LIBCPP_USING_IF_EXISTS;
#ifndef _LIBCPP_HAS_NO_THREAD_UNSAFE_C_FUNCTIONS
using ::setlocale;
using ::setlocale _LIBCPP_USING_IF_EXISTS;
#endif
using ::localeconv;
using ::localeconv _LIBCPP_USING_IF_EXISTS;
_LIBCPP_END_NAMESPACE_STD

View file

@ -318,215 +318,215 @@ _LIBCPP_PUSH_MACROS
_LIBCPP_BEGIN_NAMESPACE_STD
using ::signbit;
using ::fpclassify;
using ::isfinite;
using ::isinf;
using ::isnan;
using ::isnormal;
using ::isgreater;
using ::isgreaterequal;
using ::isless;
using ::islessequal;
using ::islessgreater;
using ::isunordered;
using ::isunordered;
using ::signbit _LIBCPP_USING_IF_EXISTS;
using ::fpclassify _LIBCPP_USING_IF_EXISTS;
using ::isfinite _LIBCPP_USING_IF_EXISTS;
using ::isinf _LIBCPP_USING_IF_EXISTS;
using ::isnan _LIBCPP_USING_IF_EXISTS;
using ::isnormal _LIBCPP_USING_IF_EXISTS;
using ::isgreater _LIBCPP_USING_IF_EXISTS;
using ::isgreaterequal _LIBCPP_USING_IF_EXISTS;
using ::isless _LIBCPP_USING_IF_EXISTS;
using ::islessequal _LIBCPP_USING_IF_EXISTS;
using ::islessgreater _LIBCPP_USING_IF_EXISTS;
using ::isunordered _LIBCPP_USING_IF_EXISTS;
using ::isunordered _LIBCPP_USING_IF_EXISTS;
using ::float_t;
using ::double_t;
using ::float_t _LIBCPP_USING_IF_EXISTS;
using ::double_t _LIBCPP_USING_IF_EXISTS;
using ::abs;
using ::abs _LIBCPP_USING_IF_EXISTS;
using ::acos;
using ::acosf;
using ::asin;
using ::asinf;
using ::atan;
using ::atanf;
using ::atan2;
using ::atan2f;
using ::ceil;
using ::ceilf;
using ::cos;
using ::cosf;
using ::cosh;
using ::coshf;
using ::acos _LIBCPP_USING_IF_EXISTS;
using ::acosf _LIBCPP_USING_IF_EXISTS;
using ::asin _LIBCPP_USING_IF_EXISTS;
using ::asinf _LIBCPP_USING_IF_EXISTS;
using ::atan _LIBCPP_USING_IF_EXISTS;
using ::atanf _LIBCPP_USING_IF_EXISTS;
using ::atan2 _LIBCPP_USING_IF_EXISTS;
using ::atan2f _LIBCPP_USING_IF_EXISTS;
using ::ceil _LIBCPP_USING_IF_EXISTS;
using ::ceilf _LIBCPP_USING_IF_EXISTS;
using ::cos _LIBCPP_USING_IF_EXISTS;
using ::cosf _LIBCPP_USING_IF_EXISTS;
using ::cosh _LIBCPP_USING_IF_EXISTS;
using ::coshf _LIBCPP_USING_IF_EXISTS;
using ::exp;
using ::expf;
using ::exp _LIBCPP_USING_IF_EXISTS;
using ::expf _LIBCPP_USING_IF_EXISTS;
using ::fabs;
using ::fabsf;
using ::floor;
using ::floorf;
using ::fabs _LIBCPP_USING_IF_EXISTS;
using ::fabsf _LIBCPP_USING_IF_EXISTS;
using ::floor _LIBCPP_USING_IF_EXISTS;
using ::floorf _LIBCPP_USING_IF_EXISTS;
using ::fmod;
using ::fmodf;
using ::fmod _LIBCPP_USING_IF_EXISTS;
using ::fmodf _LIBCPP_USING_IF_EXISTS;
using ::frexp;
using ::frexpf;
using ::ldexp;
using ::ldexpf;
using ::frexp _LIBCPP_USING_IF_EXISTS;
using ::frexpf _LIBCPP_USING_IF_EXISTS;
using ::ldexp _LIBCPP_USING_IF_EXISTS;
using ::ldexpf _LIBCPP_USING_IF_EXISTS;
using ::log;
using ::logf;
using ::log _LIBCPP_USING_IF_EXISTS;
using ::logf _LIBCPP_USING_IF_EXISTS;
using ::log10;
using ::log10f;
using ::modf;
using ::modff;
using ::log10 _LIBCPP_USING_IF_EXISTS;
using ::log10f _LIBCPP_USING_IF_EXISTS;
using ::modf _LIBCPP_USING_IF_EXISTS;
using ::modff _LIBCPP_USING_IF_EXISTS;
using ::pow;
using ::powf;
using ::pow _LIBCPP_USING_IF_EXISTS;
using ::powf _LIBCPP_USING_IF_EXISTS;
using ::sin;
using ::sinf;
using ::sinh;
using ::sinhf;
using ::sin _LIBCPP_USING_IF_EXISTS;
using ::sinf _LIBCPP_USING_IF_EXISTS;
using ::sinh _LIBCPP_USING_IF_EXISTS;
using ::sinhf _LIBCPP_USING_IF_EXISTS;
using ::sqrt;
using ::sqrtf;
using ::tan;
using ::tanf;
using ::sqrt _LIBCPP_USING_IF_EXISTS;
using ::sqrtf _LIBCPP_USING_IF_EXISTS;
using ::tan _LIBCPP_USING_IF_EXISTS;
using ::tanf _LIBCPP_USING_IF_EXISTS;
using ::tanh;
using ::tanhf;
using ::tanh _LIBCPP_USING_IF_EXISTS;
using ::tanhf _LIBCPP_USING_IF_EXISTS;
using ::acosh;
using ::acoshf;
using ::asinh;
using ::asinhf;
using ::atanh;
using ::atanhf;
using ::cbrt;
using ::cbrtf;
using ::acosh _LIBCPP_USING_IF_EXISTS;
using ::acoshf _LIBCPP_USING_IF_EXISTS;
using ::asinh _LIBCPP_USING_IF_EXISTS;
using ::asinhf _LIBCPP_USING_IF_EXISTS;
using ::atanh _LIBCPP_USING_IF_EXISTS;
using ::atanhf _LIBCPP_USING_IF_EXISTS;
using ::cbrt _LIBCPP_USING_IF_EXISTS;
using ::cbrtf _LIBCPP_USING_IF_EXISTS;
using ::copysign;
using ::copysignf;
using ::copysign _LIBCPP_USING_IF_EXISTS;
using ::copysignf _LIBCPP_USING_IF_EXISTS;
using ::erf;
using ::erff;
using ::erfc;
using ::erfcf;
using ::exp2;
using ::exp2f;
using ::expm1;
using ::expm1f;
using ::fdim;
using ::fdimf;
using ::fmaf;
using ::fma;
using ::fmax;
using ::fmaxf;
using ::fmin;
using ::fminf;
using ::hypot;
using ::hypotf;
using ::ilogb;
using ::ilogbf;
using ::lgamma;
using ::lgammaf;
using ::llrint;
using ::llrintf;
using ::llround;
using ::llroundf;
using ::log1p;
using ::log1pf;
using ::log2;
using ::log2f;
using ::logb;
using ::logbf;
using ::lrint;
using ::lrintf;
using ::lround;
using ::lroundf;
using ::erf _LIBCPP_USING_IF_EXISTS;
using ::erff _LIBCPP_USING_IF_EXISTS;
using ::erfc _LIBCPP_USING_IF_EXISTS;
using ::erfcf _LIBCPP_USING_IF_EXISTS;
using ::exp2 _LIBCPP_USING_IF_EXISTS;
using ::exp2f _LIBCPP_USING_IF_EXISTS;
using ::expm1 _LIBCPP_USING_IF_EXISTS;
using ::expm1f _LIBCPP_USING_IF_EXISTS;
using ::fdim _LIBCPP_USING_IF_EXISTS;
using ::fdimf _LIBCPP_USING_IF_EXISTS;
using ::fmaf _LIBCPP_USING_IF_EXISTS;
using ::fma _LIBCPP_USING_IF_EXISTS;
using ::fmax _LIBCPP_USING_IF_EXISTS;
using ::fmaxf _LIBCPP_USING_IF_EXISTS;
using ::fmin _LIBCPP_USING_IF_EXISTS;
using ::fminf _LIBCPP_USING_IF_EXISTS;
using ::hypot _LIBCPP_USING_IF_EXISTS;
using ::hypotf _LIBCPP_USING_IF_EXISTS;
using ::ilogb _LIBCPP_USING_IF_EXISTS;
using ::ilogbf _LIBCPP_USING_IF_EXISTS;
using ::lgamma _LIBCPP_USING_IF_EXISTS;
using ::lgammaf _LIBCPP_USING_IF_EXISTS;
using ::llrint _LIBCPP_USING_IF_EXISTS;
using ::llrintf _LIBCPP_USING_IF_EXISTS;
using ::llround _LIBCPP_USING_IF_EXISTS;
using ::llroundf _LIBCPP_USING_IF_EXISTS;
using ::log1p _LIBCPP_USING_IF_EXISTS;
using ::log1pf _LIBCPP_USING_IF_EXISTS;
using ::log2 _LIBCPP_USING_IF_EXISTS;
using ::log2f _LIBCPP_USING_IF_EXISTS;
using ::logb _LIBCPP_USING_IF_EXISTS;
using ::logbf _LIBCPP_USING_IF_EXISTS;
using ::lrint _LIBCPP_USING_IF_EXISTS;
using ::lrintf _LIBCPP_USING_IF_EXISTS;
using ::lround _LIBCPP_USING_IF_EXISTS;
using ::lroundf _LIBCPP_USING_IF_EXISTS;
using ::nan;
using ::nanf;
using ::nan _LIBCPP_USING_IF_EXISTS;
using ::nanf _LIBCPP_USING_IF_EXISTS;
using ::nearbyint;
using ::nearbyintf;
using ::nextafter;
using ::nextafterf;
using ::nexttoward;
using ::nexttowardf;
using ::remainder;
using ::remainderf;
using ::remquo;
using ::remquof;
using ::rint;
using ::rintf;
using ::round;
using ::roundf;
using ::scalbln;
using ::scalblnf;
using ::scalbn;
using ::scalbnf;
using ::tgamma;
using ::tgammaf;
using ::trunc;
using ::truncf;
using ::nearbyint _LIBCPP_USING_IF_EXISTS;
using ::nearbyintf _LIBCPP_USING_IF_EXISTS;
using ::nextafter _LIBCPP_USING_IF_EXISTS;
using ::nextafterf _LIBCPP_USING_IF_EXISTS;
using ::nexttoward _LIBCPP_USING_IF_EXISTS;
using ::nexttowardf _LIBCPP_USING_IF_EXISTS;
using ::remainder _LIBCPP_USING_IF_EXISTS;
using ::remainderf _LIBCPP_USING_IF_EXISTS;
using ::remquo _LIBCPP_USING_IF_EXISTS;
using ::remquof _LIBCPP_USING_IF_EXISTS;
using ::rint _LIBCPP_USING_IF_EXISTS;
using ::rintf _LIBCPP_USING_IF_EXISTS;
using ::round _LIBCPP_USING_IF_EXISTS;
using ::roundf _LIBCPP_USING_IF_EXISTS;
using ::scalbln _LIBCPP_USING_IF_EXISTS;
using ::scalblnf _LIBCPP_USING_IF_EXISTS;
using ::scalbn _LIBCPP_USING_IF_EXISTS;
using ::scalbnf _LIBCPP_USING_IF_EXISTS;
using ::tgamma _LIBCPP_USING_IF_EXISTS;
using ::tgammaf _LIBCPP_USING_IF_EXISTS;
using ::trunc _LIBCPP_USING_IF_EXISTS;
using ::truncf _LIBCPP_USING_IF_EXISTS;
using ::acosl;
using ::asinl;
using ::atanl;
using ::atan2l;
using ::ceill;
using ::cosl;
using ::coshl;
using ::expl;
using ::fabsl;
using ::floorl;
using ::fmodl;
using ::frexpl;
using ::ldexpl;
using ::logl;
using ::log10l;
using ::modfl;
using ::powl;
using ::sinl;
using ::sinhl;
using ::sqrtl;
using ::tanl;
using ::acosl _LIBCPP_USING_IF_EXISTS;
using ::asinl _LIBCPP_USING_IF_EXISTS;
using ::atanl _LIBCPP_USING_IF_EXISTS;
using ::atan2l _LIBCPP_USING_IF_EXISTS;
using ::ceill _LIBCPP_USING_IF_EXISTS;
using ::cosl _LIBCPP_USING_IF_EXISTS;
using ::coshl _LIBCPP_USING_IF_EXISTS;
using ::expl _LIBCPP_USING_IF_EXISTS;
using ::fabsl _LIBCPP_USING_IF_EXISTS;
using ::floorl _LIBCPP_USING_IF_EXISTS;
using ::fmodl _LIBCPP_USING_IF_EXISTS;
using ::frexpl _LIBCPP_USING_IF_EXISTS;
using ::ldexpl _LIBCPP_USING_IF_EXISTS;
using ::logl _LIBCPP_USING_IF_EXISTS;
using ::log10l _LIBCPP_USING_IF_EXISTS;
using ::modfl _LIBCPP_USING_IF_EXISTS;
using ::powl _LIBCPP_USING_IF_EXISTS;
using ::sinl _LIBCPP_USING_IF_EXISTS;
using ::sinhl _LIBCPP_USING_IF_EXISTS;
using ::sqrtl _LIBCPP_USING_IF_EXISTS;
using ::tanl _LIBCPP_USING_IF_EXISTS;
using ::tanhl;
using ::acoshl;
using ::asinhl;
using ::atanhl;
using ::cbrtl;
using ::tanhl _LIBCPP_USING_IF_EXISTS;
using ::acoshl _LIBCPP_USING_IF_EXISTS;
using ::asinhl _LIBCPP_USING_IF_EXISTS;
using ::atanhl _LIBCPP_USING_IF_EXISTS;
using ::cbrtl _LIBCPP_USING_IF_EXISTS;
using ::copysignl;
using ::copysignl _LIBCPP_USING_IF_EXISTS;
using ::erfl;
using ::erfcl;
using ::exp2l;
using ::expm1l;
using ::fdiml;
using ::fmal;
using ::fmaxl;
using ::fminl;
using ::hypotl;
using ::ilogbl;
using ::lgammal;
using ::llrintl;
using ::llroundl;
using ::log1pl;
using ::log2l;
using ::logbl;
using ::lrintl;
using ::lroundl;
using ::nanl;
using ::nearbyintl;
using ::nextafterl;
using ::nexttowardl;
using ::remainderl;
using ::remquol;
using ::rintl;
using ::roundl;
using ::scalblnl;
using ::scalbnl;
using ::tgammal;
using ::truncl;
using ::erfl _LIBCPP_USING_IF_EXISTS;
using ::erfcl _LIBCPP_USING_IF_EXISTS;
using ::exp2l _LIBCPP_USING_IF_EXISTS;
using ::expm1l _LIBCPP_USING_IF_EXISTS;
using ::fdiml _LIBCPP_USING_IF_EXISTS;
using ::fmal _LIBCPP_USING_IF_EXISTS;
using ::fmaxl _LIBCPP_USING_IF_EXISTS;
using ::fminl _LIBCPP_USING_IF_EXISTS;
using ::hypotl _LIBCPP_USING_IF_EXISTS;
using ::ilogbl _LIBCPP_USING_IF_EXISTS;
using ::lgammal _LIBCPP_USING_IF_EXISTS;
using ::llrintl _LIBCPP_USING_IF_EXISTS;
using ::llroundl _LIBCPP_USING_IF_EXISTS;
using ::log1pl _LIBCPP_USING_IF_EXISTS;
using ::log2l _LIBCPP_USING_IF_EXISTS;
using ::logbl _LIBCPP_USING_IF_EXISTS;
using ::lrintl _LIBCPP_USING_IF_EXISTS;
using ::lroundl _LIBCPP_USING_IF_EXISTS;
using ::nanl _LIBCPP_USING_IF_EXISTS;
using ::nearbyintl _LIBCPP_USING_IF_EXISTS;
using ::nextafterl _LIBCPP_USING_IF_EXISTS;
using ::nexttowardl _LIBCPP_USING_IF_EXISTS;
using ::remainderl _LIBCPP_USING_IF_EXISTS;
using ::remquol _LIBCPP_USING_IF_EXISTS;
using ::rintl _LIBCPP_USING_IF_EXISTS;
using ::roundl _LIBCPP_USING_IF_EXISTS;
using ::scalblnl _LIBCPP_USING_IF_EXISTS;
using ::scalbnl _LIBCPP_USING_IF_EXISTS;
using ::tgammal _LIBCPP_USING_IF_EXISTS;
using ::truncl _LIBCPP_USING_IF_EXISTS;
#if _LIBCPP_STD_VER > 14
inline _LIBCPP_INLINE_VISIBILITY float hypot( float x, float y, float z ) { return sqrt(x*x + y*y + z*z); }

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@ -39,8 +39,8 @@ void longjmp(jmp_buf env, int val);
_LIBCPP_BEGIN_NAMESPACE_STD
using ::jmp_buf;
using ::longjmp;
using ::jmp_buf _LIBCPP_USING_IF_EXISTS;
using ::longjmp _LIBCPP_USING_IF_EXISTS;
_LIBCPP_END_NAMESPACE_STD

View file

@ -48,9 +48,9 @@ int raise(int sig);
_LIBCPP_BEGIN_NAMESPACE_STD
using ::sig_atomic_t;
using ::signal;
using ::raise;
using ::sig_atomic_t _LIBCPP_USING_IF_EXISTS;
using ::signal _LIBCPP_USING_IF_EXISTS;
using ::raise _LIBCPP_USING_IF_EXISTS;
_LIBCPP_END_NAMESPACE_STD

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@ -40,7 +40,7 @@ Types:
_LIBCPP_BEGIN_NAMESPACE_STD
using ::va_list;
using ::va_list _LIBCPP_USING_IF_EXISTS;
_LIBCPP_END_NAMESPACE_STD

View file

@ -46,11 +46,11 @@ Types:
_LIBCPP_BEGIN_NAMESPACE_STD
using ::ptrdiff_t;
using ::size_t;
using ::ptrdiff_t _LIBCPP_USING_IF_EXISTS;
using ::size_t _LIBCPP_USING_IF_EXISTS;
#if !defined(_LIBCPP_CXX03_LANG)
using ::max_align_t;
using ::max_align_t _LIBCPP_USING_IF_EXISTS;
#endif
template <class _Tp> struct __libcpp_is_integral { enum { value = 0 }; };

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@ -149,41 +149,41 @@ Types:
_LIBCPP_BEGIN_NAMESPACE_STD
using::int8_t;
using::int16_t;
using::int32_t;
using::int64_t;
using ::int8_t _LIBCPP_USING_IF_EXISTS;
using ::int16_t _LIBCPP_USING_IF_EXISTS;
using ::int32_t _LIBCPP_USING_IF_EXISTS;
using ::int64_t _LIBCPP_USING_IF_EXISTS;
using::uint8_t;
using::uint16_t;
using::uint32_t;
using::uint64_t;
using ::uint8_t _LIBCPP_USING_IF_EXISTS;
using ::uint16_t _LIBCPP_USING_IF_EXISTS;
using ::uint32_t _LIBCPP_USING_IF_EXISTS;
using ::uint64_t _LIBCPP_USING_IF_EXISTS;
using::int_least8_t;
using::int_least16_t;
using::int_least32_t;
using::int_least64_t;
using ::int_least8_t _LIBCPP_USING_IF_EXISTS;
using ::int_least16_t _LIBCPP_USING_IF_EXISTS;
using ::int_least32_t _LIBCPP_USING_IF_EXISTS;
using ::int_least64_t _LIBCPP_USING_IF_EXISTS;
using::uint_least8_t;
using::uint_least16_t;
using::uint_least32_t;
using::uint_least64_t;
using ::uint_least8_t _LIBCPP_USING_IF_EXISTS;
using ::uint_least16_t _LIBCPP_USING_IF_EXISTS;
using ::uint_least32_t _LIBCPP_USING_IF_EXISTS;
using ::uint_least64_t _LIBCPP_USING_IF_EXISTS;
using::int_fast8_t;
using::int_fast16_t;
using::int_fast32_t;
using::int_fast64_t;
using ::int_fast8_t _LIBCPP_USING_IF_EXISTS;
using ::int_fast16_t _LIBCPP_USING_IF_EXISTS;
using ::int_fast32_t _LIBCPP_USING_IF_EXISTS;
using ::int_fast64_t _LIBCPP_USING_IF_EXISTS;
using::uint_fast8_t;
using::uint_fast16_t;
using::uint_fast32_t;
using::uint_fast64_t;
using ::uint_fast8_t _LIBCPP_USING_IF_EXISTS;
using ::uint_fast16_t _LIBCPP_USING_IF_EXISTS;
using ::uint_fast32_t _LIBCPP_USING_IF_EXISTS;
using ::uint_fast64_t _LIBCPP_USING_IF_EXISTS;
using::intptr_t;
using::uintptr_t;
using ::intptr_t _LIBCPP_USING_IF_EXISTS;
using ::uintptr_t _LIBCPP_USING_IF_EXISTS;
using::intmax_t;
using::uintmax_t;
using ::intmax_t _LIBCPP_USING_IF_EXISTS;
using ::uintmax_t _LIBCPP_USING_IF_EXISTS;
_LIBCPP_END_NAMESPACE_STD

View file

@ -104,70 +104,70 @@ void perror(const char* s);
_LIBCPP_BEGIN_NAMESPACE_STD
using ::FILE;
using ::fpos_t;
using ::size_t;
using ::FILE _LIBCPP_USING_IF_EXISTS;
using ::fpos_t _LIBCPP_USING_IF_EXISTS;
using ::size_t _LIBCPP_USING_IF_EXISTS;
using ::fclose;
using ::fflush;
using ::setbuf;
using ::setvbuf;
using ::fprintf;
using ::fscanf;
using ::snprintf;
using ::sprintf;
using ::sscanf;
using ::vfprintf;
using ::vfscanf;
using ::vsscanf;
using ::vsnprintf;
using ::vsprintf;
using ::fgetc;
using ::fgets;
using ::fputc;
using ::fputs;
using ::getc;
using ::putc;
using ::ungetc;
using ::fread;
using ::fwrite;
using ::fclose _LIBCPP_USING_IF_EXISTS;
using ::fflush _LIBCPP_USING_IF_EXISTS;
using ::setbuf _LIBCPP_USING_IF_EXISTS;
using ::setvbuf _LIBCPP_USING_IF_EXISTS;
using ::fprintf _LIBCPP_USING_IF_EXISTS;
using ::fscanf _LIBCPP_USING_IF_EXISTS;
using ::snprintf _LIBCPP_USING_IF_EXISTS;
using ::sprintf _LIBCPP_USING_IF_EXISTS;
using ::sscanf _LIBCPP_USING_IF_EXISTS;
using ::vfprintf _LIBCPP_USING_IF_EXISTS;
using ::vfscanf _LIBCPP_USING_IF_EXISTS;
using ::vsscanf _LIBCPP_USING_IF_EXISTS;
using ::vsnprintf _LIBCPP_USING_IF_EXISTS;
using ::vsprintf _LIBCPP_USING_IF_EXISTS;
using ::fgetc _LIBCPP_USING_IF_EXISTS;
using ::fgets _LIBCPP_USING_IF_EXISTS;
using ::fputc _LIBCPP_USING_IF_EXISTS;
using ::fputs _LIBCPP_USING_IF_EXISTS;
using ::getc _LIBCPP_USING_IF_EXISTS;
using ::putc _LIBCPP_USING_IF_EXISTS;
using ::ungetc _LIBCPP_USING_IF_EXISTS;
using ::fread _LIBCPP_USING_IF_EXISTS;
using ::fwrite _LIBCPP_USING_IF_EXISTS;
#ifndef _LIBCPP_HAS_NO_FGETPOS_FSETPOS
using ::fgetpos;
using ::fgetpos _LIBCPP_USING_IF_EXISTS;
#endif
using ::fseek;
using ::fseek _LIBCPP_USING_IF_EXISTS;
#ifndef _LIBCPP_HAS_NO_FGETPOS_FSETPOS
using ::fsetpos;
using ::fsetpos _LIBCPP_USING_IF_EXISTS;
#endif
using ::ftell;
using ::rewind;
using ::clearerr;
using ::feof;
using ::ferror;
using ::perror;
using ::ftell _LIBCPP_USING_IF_EXISTS;
using ::rewind _LIBCPP_USING_IF_EXISTS;
using ::clearerr _LIBCPP_USING_IF_EXISTS;
using ::feof _LIBCPP_USING_IF_EXISTS;
using ::ferror _LIBCPP_USING_IF_EXISTS;
using ::perror _LIBCPP_USING_IF_EXISTS;
#ifndef _LIBCPP_HAS_NO_GLOBAL_FILESYSTEM_NAMESPACE
using ::fopen;
using ::freopen;
using ::remove;
using ::rename;
using ::tmpfile;
using ::tmpnam;
using ::fopen _LIBCPP_USING_IF_EXISTS;
using ::freopen _LIBCPP_USING_IF_EXISTS;
using ::remove _LIBCPP_USING_IF_EXISTS;
using ::rename _LIBCPP_USING_IF_EXISTS;
using ::tmpfile _LIBCPP_USING_IF_EXISTS;
using ::tmpnam _LIBCPP_USING_IF_EXISTS;
#endif
#ifndef _LIBCPP_HAS_NO_STDIN
using ::getchar;
using ::getchar _LIBCPP_USING_IF_EXISTS;
#if _LIBCPP_STD_VER <= 11 && !defined(_LIBCPP_C_HAS_NO_GETS)
using ::gets;
using ::gets _LIBCPP_USING_IF_EXISTS;
#endif
using ::scanf;
using ::vscanf;
using ::scanf _LIBCPP_USING_IF_EXISTS;
using ::vscanf _LIBCPP_USING_IF_EXISTS;
#endif
#ifndef _LIBCPP_HAS_NO_STDOUT
using ::printf;
using ::putchar;
using ::puts;
using ::vprintf;
using ::printf _LIBCPP_USING_IF_EXISTS;
using ::putchar _LIBCPP_USING_IF_EXISTS;
using ::puts _LIBCPP_USING_IF_EXISTS;
using ::vprintf _LIBCPP_USING_IF_EXISTS;
#endif
_LIBCPP_END_NAMESPACE_STD

View file

@ -96,66 +96,66 @@ void *aligned_alloc(size_t alignment, size_t size); // C11
_LIBCPP_BEGIN_NAMESPACE_STD
using ::size_t;
using ::div_t;
using ::ldiv_t;
using ::size_t _LIBCPP_USING_IF_EXISTS;
using ::div_t _LIBCPP_USING_IF_EXISTS;
using ::ldiv_t _LIBCPP_USING_IF_EXISTS;
#ifndef _LIBCPP_HAS_NO_LONG_LONG
using ::lldiv_t;
using ::lldiv_t _LIBCPP_USING_IF_EXISTS;
#endif // _LIBCPP_HAS_NO_LONG_LONG
using ::atof;
using ::atoi;
using ::atol;
using ::atof _LIBCPP_USING_IF_EXISTS;
using ::atoi _LIBCPP_USING_IF_EXISTS;
using ::atol _LIBCPP_USING_IF_EXISTS;
#ifndef _LIBCPP_HAS_NO_LONG_LONG
using ::atoll;
using ::atoll _LIBCPP_USING_IF_EXISTS;
#endif // _LIBCPP_HAS_NO_LONG_LONG
using ::strtod;
using ::strtof;
using ::strtold;
using ::strtol;
using ::strtod _LIBCPP_USING_IF_EXISTS;
using ::strtof _LIBCPP_USING_IF_EXISTS;
using ::strtold _LIBCPP_USING_IF_EXISTS;
using ::strtol _LIBCPP_USING_IF_EXISTS;
#ifndef _LIBCPP_HAS_NO_LONG_LONG
using ::strtoll;
using ::strtoll _LIBCPP_USING_IF_EXISTS;
#endif // _LIBCPP_HAS_NO_LONG_LONG
using ::strtoul;
using ::strtoul _LIBCPP_USING_IF_EXISTS;
#ifndef _LIBCPP_HAS_NO_LONG_LONG
using ::strtoull;
using ::strtoull _LIBCPP_USING_IF_EXISTS;
#endif // _LIBCPP_HAS_NO_LONG_LONG
using ::rand;
using ::srand;
using ::calloc;
using ::free;
using ::malloc;
using ::realloc;
using ::abort;
using ::atexit;
using ::exit;
using ::_Exit;
using ::rand _LIBCPP_USING_IF_EXISTS;
using ::srand _LIBCPP_USING_IF_EXISTS;
using ::calloc _LIBCPP_USING_IF_EXISTS;
using ::free _LIBCPP_USING_IF_EXISTS;
using ::malloc _LIBCPP_USING_IF_EXISTS;
using ::realloc _LIBCPP_USING_IF_EXISTS;
using ::abort _LIBCPP_USING_IF_EXISTS;
using ::atexit _LIBCPP_USING_IF_EXISTS;
using ::exit _LIBCPP_USING_IF_EXISTS;
using ::_Exit _LIBCPP_USING_IF_EXISTS;
#ifndef _LIBCPP_WINDOWS_STORE_APP
using ::getenv;
using ::system;
using ::getenv _LIBCPP_USING_IF_EXISTS;
using ::system _LIBCPP_USING_IF_EXISTS;
#endif
using ::bsearch;
using ::qsort;
using ::abs;
using ::labs;
using ::bsearch _LIBCPP_USING_IF_EXISTS;
using ::qsort _LIBCPP_USING_IF_EXISTS;
using ::abs _LIBCPP_USING_IF_EXISTS;
using ::labs _LIBCPP_USING_IF_EXISTS;
#ifndef _LIBCPP_HAS_NO_LONG_LONG
using ::llabs;
using ::llabs _LIBCPP_USING_IF_EXISTS;
#endif // _LIBCPP_HAS_NO_LONG_LONG
using ::div;
using ::ldiv;
using ::div _LIBCPP_USING_IF_EXISTS;
using ::ldiv _LIBCPP_USING_IF_EXISTS;
#ifndef _LIBCPP_HAS_NO_LONG_LONG
using ::lldiv;
using ::lldiv _LIBCPP_USING_IF_EXISTS;
#endif // _LIBCPP_HAS_NO_LONG_LONG
using ::mblen;
using ::mbtowc;
using ::wctomb;
using ::mbstowcs;
using ::wcstombs;
using ::mblen _LIBCPP_USING_IF_EXISTS;
using ::mbtowc _LIBCPP_USING_IF_EXISTS;
using ::wctomb _LIBCPP_USING_IF_EXISTS;
using ::mbstowcs _LIBCPP_USING_IF_EXISTS;
using ::wcstombs _LIBCPP_USING_IF_EXISTS;
#if !defined(_LIBCPP_CXX03_LANG) && defined(_LIBCPP_HAS_QUICK_EXIT)
using ::at_quick_exit;
using ::quick_exit;
using ::at_quick_exit _LIBCPP_USING_IF_EXISTS;
using ::quick_exit _LIBCPP_USING_IF_EXISTS;
#endif
#if _LIBCPP_STD_VER > 14 && defined(_LIBCPP_HAS_ALIGNED_ALLOC)
using ::aligned_alloc;
using ::aligned_alloc _LIBCPP_USING_IF_EXISTS;
#endif
_LIBCPP_END_NAMESPACE_STD

View file

@ -65,31 +65,31 @@ size_t strlen(const char* s);
_LIBCPP_BEGIN_NAMESPACE_STD
using ::size_t;
using ::memcpy;
using ::memmove;
using ::strcpy;
using ::strncpy;
using ::strcat;
using ::strncat;
using ::memcmp;
using ::strcmp;
using ::strncmp;
using ::strcoll;
using ::strxfrm;
using ::memchr;
using ::strchr;
using ::strcspn;
using ::strpbrk;
using ::strrchr;
using ::strspn;
using ::strstr;
using ::size_t _LIBCPP_USING_IF_EXISTS;
using ::memcpy _LIBCPP_USING_IF_EXISTS;
using ::memmove _LIBCPP_USING_IF_EXISTS;
using ::strcpy _LIBCPP_USING_IF_EXISTS;
using ::strncpy _LIBCPP_USING_IF_EXISTS;
using ::strcat _LIBCPP_USING_IF_EXISTS;
using ::strncat _LIBCPP_USING_IF_EXISTS;
using ::memcmp _LIBCPP_USING_IF_EXISTS;
using ::strcmp _LIBCPP_USING_IF_EXISTS;
using ::strncmp _LIBCPP_USING_IF_EXISTS;
using ::strcoll _LIBCPP_USING_IF_EXISTS;
using ::strxfrm _LIBCPP_USING_IF_EXISTS;
using ::memchr _LIBCPP_USING_IF_EXISTS;
using ::strchr _LIBCPP_USING_IF_EXISTS;
using ::strcspn _LIBCPP_USING_IF_EXISTS;
using ::strpbrk _LIBCPP_USING_IF_EXISTS;
using ::strrchr _LIBCPP_USING_IF_EXISTS;
using ::strspn _LIBCPP_USING_IF_EXISTS;
using ::strstr _LIBCPP_USING_IF_EXISTS;
#ifndef _LIBCPP_HAS_NO_THREAD_UNSAFE_C_FUNCTIONS
using ::strtok;
using ::strtok _LIBCPP_USING_IF_EXISTS;
#endif
using ::memset;
using ::strerror;
using ::strlen;
using ::memset _LIBCPP_USING_IF_EXISTS;
using ::strerror _LIBCPP_USING_IF_EXISTS;
using ::strlen _LIBCPP_USING_IF_EXISTS;
_LIBCPP_END_NAMESPACE_STD

View file

@ -68,26 +68,26 @@ int timespec_get( struct timespec *ts, int base); // C++17
_LIBCPP_BEGIN_NAMESPACE_STD
using ::clock_t;
using ::size_t;
using ::time_t;
using ::tm;
using ::clock_t _LIBCPP_USING_IF_EXISTS;
using ::size_t _LIBCPP_USING_IF_EXISTS;
using ::time_t _LIBCPP_USING_IF_EXISTS;
using ::tm _LIBCPP_USING_IF_EXISTS;
#if _LIBCPP_STD_VER > 14 && defined(_LIBCPP_HAS_TIMESPEC_GET)
using ::timespec;
using ::timespec _LIBCPP_USING_IF_EXISTS;
#endif
using ::clock;
using ::difftime;
using ::mktime;
using ::time;
using ::clock _LIBCPP_USING_IF_EXISTS;
using ::difftime _LIBCPP_USING_IF_EXISTS;
using ::mktime _LIBCPP_USING_IF_EXISTS;
using ::time _LIBCPP_USING_IF_EXISTS;
#ifndef _LIBCPP_HAS_NO_THREAD_UNSAFE_C_FUNCTIONS
using ::asctime;
using ::ctime;
using ::gmtime;
using ::localtime;
using ::asctime _LIBCPP_USING_IF_EXISTS;
using ::ctime _LIBCPP_USING_IF_EXISTS;
using ::gmtime _LIBCPP_USING_IF_EXISTS;
using ::localtime _LIBCPP_USING_IF_EXISTS;
#endif
using ::strftime;
using ::strftime _LIBCPP_USING_IF_EXISTS;
#if _LIBCPP_STD_VER > 14 && defined(_LIBCPP_HAS_TIMESPEC_GET) && !defined(_LIBCPP_HAS_TIMESPEC_GET_NOT_ACTUALLY_PROVIDED)
using ::timespec_get;
using ::timespec_get _LIBCPP_USING_IF_EXISTS;
#endif
_LIBCPP_END_NAMESPACE_STD

View file

@ -112,79 +112,79 @@ size_t wcsrtombs(char* restrict dst, const wchar_t** restrict src, size_t len,
_LIBCPP_BEGIN_NAMESPACE_STD
using ::mbstate_t;
using ::size_t;
using ::tm;
using ::wint_t;
using ::FILE;
using ::fwprintf;
using ::fwscanf;
using ::swprintf;
using ::vfwprintf;
using ::vswprintf;
using ::swscanf;
using ::vfwscanf;
using ::vswscanf;
using ::fgetwc;
using ::fgetws;
using ::fputwc;
using ::fputws;
using ::fwide;
using ::getwc;
using ::putwc;
using ::ungetwc;
using ::wcstod;
using ::wcstof;
using ::wcstold;
using ::wcstol;
using ::mbstate_t _LIBCPP_USING_IF_EXISTS;
using ::size_t _LIBCPP_USING_IF_EXISTS;
using ::tm _LIBCPP_USING_IF_EXISTS;
using ::wint_t _LIBCPP_USING_IF_EXISTS;
using ::FILE _LIBCPP_USING_IF_EXISTS;
using ::fwprintf _LIBCPP_USING_IF_EXISTS;
using ::fwscanf _LIBCPP_USING_IF_EXISTS;
using ::swprintf _LIBCPP_USING_IF_EXISTS;
using ::vfwprintf _LIBCPP_USING_IF_EXISTS;
using ::vswprintf _LIBCPP_USING_IF_EXISTS;
using ::swscanf _LIBCPP_USING_IF_EXISTS;
using ::vfwscanf _LIBCPP_USING_IF_EXISTS;
using ::vswscanf _LIBCPP_USING_IF_EXISTS;
using ::fgetwc _LIBCPP_USING_IF_EXISTS;
using ::fgetws _LIBCPP_USING_IF_EXISTS;
using ::fputwc _LIBCPP_USING_IF_EXISTS;
using ::fputws _LIBCPP_USING_IF_EXISTS;
using ::fwide _LIBCPP_USING_IF_EXISTS;
using ::getwc _LIBCPP_USING_IF_EXISTS;
using ::putwc _LIBCPP_USING_IF_EXISTS;
using ::ungetwc _LIBCPP_USING_IF_EXISTS;
using ::wcstod _LIBCPP_USING_IF_EXISTS;
using ::wcstof _LIBCPP_USING_IF_EXISTS;
using ::wcstold _LIBCPP_USING_IF_EXISTS;
using ::wcstol _LIBCPP_USING_IF_EXISTS;
#ifndef _LIBCPP_HAS_NO_LONG_LONG
using ::wcstoll;
using ::wcstoll _LIBCPP_USING_IF_EXISTS;
#endif // _LIBCPP_HAS_NO_LONG_LONG
using ::wcstoul;
using ::wcstoul _LIBCPP_USING_IF_EXISTS;
#ifndef _LIBCPP_HAS_NO_LONG_LONG
using ::wcstoull;
using ::wcstoull _LIBCPP_USING_IF_EXISTS;
#endif // _LIBCPP_HAS_NO_LONG_LONG
using ::wcscpy;
using ::wcsncpy;
using ::wcscat;
using ::wcsncat;
using ::wcscmp;
using ::wcscoll;
using ::wcsncmp;
using ::wcsxfrm;
using ::wcschr;
using ::wcspbrk;
using ::wcsrchr;
using ::wcsstr;
using ::wmemchr;
using ::wcscspn;
using ::wcslen;
using ::wcsspn;
using ::wcstok;
using ::wmemcmp;
using ::wmemcpy;
using ::wmemmove;
using ::wmemset;
using ::wcsftime;
using ::btowc;
using ::wctob;
using ::mbsinit;
using ::mbrlen;
using ::mbrtowc;
using ::wcrtomb;
using ::mbsrtowcs;
using ::wcsrtombs;
using ::wcscpy _LIBCPP_USING_IF_EXISTS;
using ::wcsncpy _LIBCPP_USING_IF_EXISTS;
using ::wcscat _LIBCPP_USING_IF_EXISTS;
using ::wcsncat _LIBCPP_USING_IF_EXISTS;
using ::wcscmp _LIBCPP_USING_IF_EXISTS;
using ::wcscoll _LIBCPP_USING_IF_EXISTS;
using ::wcsncmp _LIBCPP_USING_IF_EXISTS;
using ::wcsxfrm _LIBCPP_USING_IF_EXISTS;
using ::wcschr _LIBCPP_USING_IF_EXISTS;
using ::wcspbrk _LIBCPP_USING_IF_EXISTS;
using ::wcsrchr _LIBCPP_USING_IF_EXISTS;
using ::wcsstr _LIBCPP_USING_IF_EXISTS;
using ::wmemchr _LIBCPP_USING_IF_EXISTS;
using ::wcscspn _LIBCPP_USING_IF_EXISTS;
using ::wcslen _LIBCPP_USING_IF_EXISTS;
using ::wcsspn _LIBCPP_USING_IF_EXISTS;
using ::wcstok _LIBCPP_USING_IF_EXISTS;
using ::wmemcmp _LIBCPP_USING_IF_EXISTS;
using ::wmemcpy _LIBCPP_USING_IF_EXISTS;
using ::wmemmove _LIBCPP_USING_IF_EXISTS;
using ::wmemset _LIBCPP_USING_IF_EXISTS;
using ::wcsftime _LIBCPP_USING_IF_EXISTS;
using ::btowc _LIBCPP_USING_IF_EXISTS;
using ::wctob _LIBCPP_USING_IF_EXISTS;
using ::mbsinit _LIBCPP_USING_IF_EXISTS;
using ::mbrlen _LIBCPP_USING_IF_EXISTS;
using ::mbrtowc _LIBCPP_USING_IF_EXISTS;
using ::wcrtomb _LIBCPP_USING_IF_EXISTS;
using ::mbsrtowcs _LIBCPP_USING_IF_EXISTS;
using ::wcsrtombs _LIBCPP_USING_IF_EXISTS;
#ifndef _LIBCPP_HAS_NO_STDIN
using ::getwchar;
using ::vwscanf;
using ::wscanf;
using ::getwchar _LIBCPP_USING_IF_EXISTS;
using ::vwscanf _LIBCPP_USING_IF_EXISTS;
using ::wscanf _LIBCPP_USING_IF_EXISTS;
#endif
#ifndef _LIBCPP_HAS_NO_STDOUT
using ::putwchar;
using ::vwprintf;
using ::wprintf;
using ::putwchar _LIBCPP_USING_IF_EXISTS;
using ::vwprintf _LIBCPP_USING_IF_EXISTS;
using ::wprintf _LIBCPP_USING_IF_EXISTS;
#endif
_LIBCPP_END_NAMESPACE_STD

View file

@ -59,27 +59,27 @@ wctrans_t wctrans(const char* property);
_LIBCPP_BEGIN_NAMESPACE_STD
using ::wint_t;
using ::wctrans_t;
using ::wctype_t;
using ::iswalnum;
using ::iswalpha;
using ::iswblank;
using ::iswcntrl;
using ::iswdigit;
using ::iswgraph;
using ::iswlower;
using ::iswprint;
using ::iswpunct;
using ::iswspace;
using ::iswupper;
using ::iswxdigit;
using ::iswctype;
using ::wctype;
using ::towlower;
using ::towupper;
using ::towctrans;
using ::wctrans;
using ::wint_t _LIBCPP_USING_IF_EXISTS;
using ::wctrans_t _LIBCPP_USING_IF_EXISTS;
using ::wctype_t _LIBCPP_USING_IF_EXISTS;
using ::iswalnum _LIBCPP_USING_IF_EXISTS;
using ::iswalpha _LIBCPP_USING_IF_EXISTS;
using ::iswblank _LIBCPP_USING_IF_EXISTS;
using ::iswcntrl _LIBCPP_USING_IF_EXISTS;
using ::iswdigit _LIBCPP_USING_IF_EXISTS;
using ::iswgraph _LIBCPP_USING_IF_EXISTS;
using ::iswlower _LIBCPP_USING_IF_EXISTS;
using ::iswprint _LIBCPP_USING_IF_EXISTS;
using ::iswpunct _LIBCPP_USING_IF_EXISTS;
using ::iswspace _LIBCPP_USING_IF_EXISTS;
using ::iswupper _LIBCPP_USING_IF_EXISTS;
using ::iswxdigit _LIBCPP_USING_IF_EXISTS;
using ::iswctype _LIBCPP_USING_IF_EXISTS;
using ::wctype _LIBCPP_USING_IF_EXISTS;
using ::towlower _LIBCPP_USING_IF_EXISTS;
using ::towupper _LIBCPP_USING_IF_EXISTS;
using ::towctrans _LIBCPP_USING_IF_EXISTS;
using ::wctrans _LIBCPP_USING_IF_EXISTS;
_LIBCPP_END_NAMESPACE_STD