[v3 patch] add emplace members to vector<bool>

Jonathan Wakely jwakely.gcc@gmail.com
Fri Nov 15 16:35:00 GMT 2013


Implement LWG 2187.

        * include/bits/stl_bvector.h (vector<bool>::emplace_back()): LWG 2187:
        Define.
        (vector<bool>::emplace()): Likewise.
        * testsuite/23_containers/vector/bool/emplace.cc: New.

Teted x86_64-linux, committed to trunk.
-------------- next part --------------
diff --git a/libstdc++-v3/include/bits/stl_bvector.h b/libstdc++-v3/include/bits/stl_bvector.h
index 8e4b023..3b5a0c2 100644
--- a/libstdc++-v3/include/bits/stl_bvector.h
+++ b/libstdc++-v3/include/bits/stl_bvector.h
@@ -971,7 +971,18 @@ template<typename _Alloc>
     clear() _GLIBCXX_NOEXCEPT
     { _M_erase_at_end(begin()); }
 
-   
+#if __cplusplus >= 201103L
+    template<typename... _Args>
+      void
+      emplace_back(_Args&&... __args)
+      { push_back(bool(__args...)); }
+
+    template<typename... _Args>
+      iterator
+      emplace(const_iterator __pos, _Args&&... __args)
+      { return insert(__pos, bool(__args...)); }
+#endif
+
   protected:
     // Precondition: __first._M_offset == 0 && __result._M_offset == 0.
     iterator
diff --git a/libstdc++-v3/testsuite/23_containers/vector/bool/emplace.cc b/libstdc++-v3/testsuite/23_containers/vector/bool/emplace.cc
new file mode 100644
index 0000000..f44ea1f
--- /dev/null
+++ b/libstdc++-v3/testsuite/23_containers/vector/bool/emplace.cc
@@ -0,0 +1,51 @@
+// { dg-options " -std=gnu++11 " }
+
+// Copyright (C) 2013 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3.  If not see
+// <http://www.gnu.org/licenses/>.
+
+// 23.3.8  class vector<bool>
+
+#include <vector>
+#include <testsuite_hooks.h>
+
+void test01()
+{
+  std::vector<bool> v;
+  v.emplace_back();
+  VERIFY( v[0] == false );
+  v.emplace_back(1);
+  VERIFY( v[1] == true );
+  VERIFY( v.size() == 2 );
+}
+
+void test02()
+{
+  std::vector<bool> v;
+  auto it = v.emplace(v.cbegin());
+  VERIFY( it == v.begin() );
+  VERIFY( *it == false );
+  it = v.emplace(it, 1);
+  VERIFY( it == v.begin() );
+  VERIFY( *it == true );
+  VERIFY( v.size() == 2 );
+}
+
+int main()
+{
+  test01();
+  test02();
+}


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