libcxx: see if clang-cl likes this.

Not for review.

Author: jeremyd2019

libcxx/include/__ostream/basic_ostream.h

@@ -71,7 +71,7 @@ class basic_ostream : virtual public basic_ios<_CharT, _Traits> {
 
 public:
   // 27.7.2.4 Prefix/suffix:
-  class sentry;
+  class _LIBCPP_EXPORTED_FROM_ABI sentry;
 
   // 27.7.2.6 Formatted output:
   inline _LIBCPP_HIDE_FROM_ABI_AFTER_V1 basic_ostream& operator<<(basic_ostream& (*__pf)(basic_ostream&)) {
@@ -181,42 +181,38 @@ class basic_ostream : virtual public basic_ios<_CharT, _Traits> {
 };
 
 template <class _CharT, class _Traits>
-class basic_ostream<_CharT, _Traits>::sentry {
+class _LIBCPP_EXPORTED_FROM_ABI basic_ostream<_CharT, _Traits>::sentry {
   bool __ok_;
   basic_ostream<_CharT, _Traits>& __os_;
 
 public:
-  explicit sentry(basic_ostream<_CharT, _Traits>& __os);
-  ~sentry();
-  sentry(const sentry&)            = delete;
-  sentry& operator=(const sentry&) = delete;
-
-  _LIBCPP_HIDE_FROM_ABI explicit operator bool() const { return __ok_; }
-};
-
-template <class _CharT, class _Traits>
-basic_ostream<_CharT, _Traits>::sentry::sentry(basic_ostream<_CharT, _Traits>& __os) : __ok_(false), __os_(__os) {
-  if (__os.good()) {
-    if (__os.tie())
-      __os.tie()->flush();
-    __ok_ = true;
+  explicit sentry(basic_ostream<_CharT, _Traits>& __os) : __ok_(false), __os_(__os) {
+    if (__os.good()) {
+      if (__os.tie())
+        __os.tie()->flush();
+      __ok_ = true;
+    }
   }
-}
 
-template <class _CharT, class _Traits>
-basic_ostream<_CharT, _Traits>::sentry::~sentry() {
-  if (__os_.rdbuf() && __os_.good() && (__os_.flags() & ios_base::unitbuf) && uncaught_exceptions() == 0) {
+  ~sentry() {
+    if (__os_.rdbuf() && __os_.good() && (__os_.flags() & ios_base::unitbuf) && uncaught_exceptions() == 0) {
 #  if _LIBCPP_HAS_EXCEPTIONS
-    try {
+      try {
 #  endif // _LIBCPP_HAS_EXCEPTIONS
-      if (__os_.rdbuf()->pubsync() == -1)
-        __os_.setstate(ios_base::badbit);
+        if (__os_.rdbuf()->pubsync() == -1)
+          __os_.setstate(ios_base::badbit);
 #  if _LIBCPP_HAS_EXCEPTIONS
-    } catch (...) {
-    }
+      } catch (...) {
+      }
 #  endif // _LIBCPP_HAS_EXCEPTIONS
+    }
   }
-}
+
+  sentry(const sentry&)            = delete;
+  sentry& operator=(const sentry&) = delete;
+
+  _LIBCPP_HIDE_FROM_ABI explicit operator bool() const { return __ok_; }
+};
 
 template <class _CharT, class _Traits>
 basic_ostream<_CharT, _Traits>::basic_ostream(basic_ostream&& __rhs) {

libcxx/include/istream

@@ -228,7 +228,7 @@ public:
   basic_istream& operator=(const basic_istream& __rhs) = delete;
 
   // 27.7.1.1.3 Prefix/suffix:
-  class sentry;
+  class _LIBCPP_EXPORTED_FROM_ABI sentry;
 
   // 27.7.1.2 Formatted input:
   inline _LIBCPP_HIDE_FROM_ABI_AFTER_V1 basic_istream& operator>>(basic_istream& (*__pf)(basic_istream&)) {
@@ -305,11 +305,29 @@ public:
 };
 
 template <class _CharT, class _Traits>
-class basic_istream<_CharT, _Traits>::sentry {
+class _LIBCPP_EXPORTED_FROM_ABI basic_istream<_CharT, _Traits>::sentry {
   bool __ok_;
 
 public:
-  explicit sentry(basic_istream<_CharT, _Traits>& __is, bool __noskipws = false);
+  explicit sentry(basic_istream<_CharT, _Traits>& __is, bool __noskipws = false) : __ok_(false) {
+    if (__is.good()) {
+      if (__is.tie())
+        __is.tie()->flush();
+      if (!__noskipws && (__is.flags() & ios_base::skipws)) {
+        typedef istreambuf_iterator<_CharT, _Traits> _Ip;
+        const ctype<_CharT>& __ct = std::use_facet<ctype<_CharT> >(__is.getloc());
+        _Ip __i(__is);
+        _Ip __eof;
+        for (; __i != __eof; ++__i)
+          if (!__ct.is(__ct.space, *__i))
+            break;
+        if (__i == __eof)
+          __is.setstate(ios_base::failbit | ios_base::eofbit);
+      }
+      __ok_ = __is.good();
+    } else
+      __is.setstate(ios_base::failbit);
+  }
   //    ~sentry() = default;
 
   _LIBCPP_HIDE_FROM_ABI explicit operator bool() const { return __ok_; }