re PR libstdc++/8466 (basic_stringbuf::str(basic_string const&) modifies its argument)

2002-11-05  Paolo Carlini  <pcarlini@unitus.it>

	PR libstdc++/8466
	* include/std/std_sstream.h
	(basic_stringbuf::str(const __string_type&)):
	Cannot use simple assignment since the COW-nature of v3
	basic_string is not taken into account in basic_stringbuf.
	* testsuite/27_io/stringstream_members.cc: Add test04 from PR.

From-SVN: r58838

libstdc++-v3/ChangeLog

+2002-11-05  Paolo Carlini  <pcarlini@unitus.it>
+
+	PR libstdc++/8466
+	* include/std/std_sstream.h
+	(basic_stringbuf::str(const __string_type&)):
+	Cannot use simple assignment since the COW-nature of v3
+	basic_string is not taken into account in basic_stringbuf.
+	* testsuite/27_io/stringstream_members.cc: Add test04 from PR.
+
 2002-11-05  John David Anglin  <dave@hiauly1.hia.nrc.ca>
 
 	* configure.target (hppa*): Define cpu_include_dir.

libstdc++-v3/include/std/std_sstream.h

@@ -105,7 +105,8 @@ namespace std
       void
       str(const __string_type& __s)
       {
-	_M_string = __s;
+	// Cannot use _M_string = __s, since v3 strings are COW.
+	_M_string.assign(__s.c_str(), __s.size());
 	_M_stringbuf_init(_M_mode);
       }
 

libstdc++-v3/testsuite/27_io/stringstream_members.cc

@@ -177,10 +177,26 @@ test03()
   std::stringstream ss2(str3, std::ios_base::in|std::ios_base::out);
 }
 
+// libstdc++/8466
+void test04()
+{
+  bool test = true;
+
+  const char* strlit00 = "orvieto";
+  const std::string str00 = strlit00;
+
+  std::ostringstream oss;
+
+  oss.str(str00);
+  oss << "cortona";
+  VERIFY( str00 == strlit00 );
+}
+
 int main()
 {
   test01();
   test02();
   test03();
+  test04();
   return 0;
 }