From: Jonathan Wakely <jwakely@redhat.com>
Date: Wed, 24 Sep 2014 22:13:35 +0000 (+0100)
Subject: re PR libstdc++/56193 (ios_base should replace operator void* with explicit operator... 
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=2d57872662dbc913717b84343606a7d7fa6f6226;p=gcc.git

re PR libstdc++/56193 (ios_base should replace operator void* with explicit operator bool in C++11 onwards.)

	PR libstdc++/56193
	* config/abi/pre/gnu.ver: Add new exports.
	* include/bits/basic_ios.h (basic_ios::operator bool): Define.
	* src/c++98/ios_locale.cc (basic_ios::operator void*): Instantiate.

From-SVN: r215571
---

diff --git a/libstdc++-v3/ChangeLog b/libstdc++-v3/ChangeLog
index 5f53cddd2f8..34a3d003eb1 100644
--- a/libstdc++-v3/ChangeLog
+++ b/libstdc++-v3/ChangeLog
@@ -3,6 +3,11 @@
 	* config/abi/pre/gnu.ver: Make GLIBCXX_3.4 patterns stricter so the
 	new GLIBCXX_3.4.21 symbols don't match them.
 
+	PR libstdc++/56193
+	* config/abi/pre/gnu.ver: Add new exports.
+	* include/bits/basic_ios.h (basic_ios::operator bool): Define.
+	* src/c++98/ios_locale.cc (basic_ios::operator void*): Instantiate.
+
 2014-09-24  François Dumont  <fdumont@gcc.gnu.org>
 
 	PR libstdc++/29988
diff --git a/libstdc++-v3/config/abi/pre/gnu.ver b/libstdc++-v3/config/abi/pre/gnu.ver
index 63985fd8538..0559444a87b 100644
--- a/libstdc++-v3/config/abi/pre/gnu.ver
+++ b/libstdc++-v3/config/abi/pre/gnu.ver
@@ -1470,6 +1470,9 @@ GLIBCXX_3.4.21 {
     _ZNSoC[12]ERSd;
     _ZNSt13basic_ostreamIwSt11char_traitsIwEEC[12]ERSt14basic_iostreamIwS1_E;
 
+    # std::basic_ios::operator bool() const
+    _ZNKSt9basic_iosI[cw]St11char_traitsI[cw]EEcvbEv;
+
 } GLIBCXX_3.4.20;
 
 
diff --git a/libstdc++-v3/include/bits/basic_ios.h b/libstdc++-v3/include/bits/basic_ios.h
index 10263ed07a4..0a83d0d1f28 100644
--- a/libstdc++-v3/include/bits/basic_ios.h
+++ b/libstdc++-v3/include/bits/basic_ios.h
@@ -113,8 +113,13 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
        *  This allows you to write constructs such as
        *  <code>if (!a_stream) ...</code> and <code>while (a_stream) ...</code>
       */
+#if __cplusplus >= 201103L
+      explicit operator bool() const
+      { return !this->fail(); }
+#else
       operator void*() const
       { return this->fail() ? 0 : const_cast<basic_ios*>(this); }
+#endif
 
       bool
       operator!() const
diff --git a/libstdc++-v3/src/c++98/ios_locale.cc b/libstdc++-v3/src/c++98/ios_locale.cc
index fd2e9e430d8..968af981f41 100644
--- a/libstdc++-v3/src/c++98/ios_locale.cc
+++ b/libstdc++-v3/src/c++98/ios_locale.cc
@@ -54,5 +54,12 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION
     return __old;
   }
 
+  // Explicit instantiations for basic_ios are done in src/c++11/ios.cc
+  // and so do not include this member, which is only defined for C++98.
+  template basic_ios<char>::operator void*() const;
+#ifdef _GLIBCXX_USE_WCHAR_T
+  template basic_ios<wchar_t>::operator void*() const;
+#endif
+
 _GLIBCXX_END_NAMESPACE_VERSION
 } // namespace