std_valarray.h (valarray<>::operator[] const): Return a const reference.

        * include/bits/std_valarray.h (valarray<>::operator[] const):
        Return a const reference.
        * testsuite/26_numerics/valarray_const_bracket.cc: New test.

From-SVN: r42245

diff --git a/libstdc++-v3/include/bits/std_valarray.h b/libstdc++-v3/include/bits/std_valarray.h
index 15a58421d8e7d06ab3432b353af5feca38444d89..a250dfd122e84acb2032d5b4c48a387af4b3094b 100644 (file)
--- a/libstdc++-v3/include/bits/std_valarray.h
+++ b/libstdc++-v3/include/bits/std_valarray.h
@@ -120,7 +120,8 @@ namespace std
        operator= (const _Expr<_Dom,_Tp>&);
 
       // _lib.valarray.access_ element access:
-      _Tp                 operator[](size_t) const;
+      // XXX: LWG to be resolved.
+      const _Tp&                 operator[](size_t) const;
       _Tp&                operator[](size_t);          
       // _lib.valarray.sub_ subset operations:
       _Expr<_SClos<_ValArray,_Tp>, _Tp> operator[](slice) const;
@@ -236,7 +237,7 @@ namespace std
 
   
   template<typename _Tp>
-  inline _Tp
+  inline const _Tp&
   valarray<_Tp>::operator[] (size_t __i) const
   { return _M_data[__i]; }
 

diff --git a/libstdc++-v3/testsuite/26_numerics/valarray_const_bracket.cc b/libstdc++-v3/testsuite/26_numerics/valarray_const_bracket.cc
new file mode 100644 (file)
index 0000000..53819f4
--- /dev/null
+++ b/libstdc++-v3/testsuite/26_numerics/valarray_const_bracket.cc
@@ -0,0 +1,48 @@
+// 20010518 gdr
+
+// Copyright (C) 2001 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 2, 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 COPYING.  If not, write to the Free
+// Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307,
+// USA.
+
+// As a special exception, you may use this file as part of a free software
+// library without restriction.  Specifically, if other files instantiate
+// templates or use macros or inline functions from this file, or you compile
+// this file and link it with other files to produce an executable, this
+// file does not by itself cause the resulting executable to be covered by
+// the GNU General Public License.  This exception does not however
+// invalidate any other reasons why the executable file might be covered by
+// the GNU General Public License.
+
+#include <valarray>
+
+// dg-do compile
+
+template<typename P>
+  void copy(P, std::size_t) { }
+
+template<typename T>
+  void test(const std::valarray<T>& v)
+  {
+     copy(&v[0], v.size());
+  }
+
+int main()
+{
+  std::valarray<double> v(190);
+  test(v);
+  return 0;
+}