Implement LWG 2758.

	* include/bits/basic_string.h
	(append(__sv_type, size_type, size_type)): Turn into a template,
	change parameter type, constrain, add a conversion to __sv_type
	from the dependent parameter type.
	(assign(__sv_type, size_type, size_type)): Likewise.
	(insert(size_type, __sv_type, size_type, size_type)): Likewise.
	(replace(size_type, size_type, __sv_type, size_type, size_type)):
	Likewise.
	(compare(size_type, size_type,__sv_type, size_type, size_type)):
	Likewise.
	* testsuite/21_strings/basic_string/lwg2758.cc: New.

From-SVN: r239370

diff --git a/libstdc++-v3/ChangeLog b/libstdc++-v3/ChangeLog
index c676d03..def5c29 100644 (file)
--- a/libstdc++-v3/ChangeLog
+++ b/libstdc++-v3/ChangeLog
@@ -1,3 +1,18 @@
+2016-08-11  Ville Voutilainen  <ville.voutilainen@gmail.com>
+
+       Implement LWG 2758.
+       * include/bits/basic_string.h
+       (append(__sv_type, size_type, size_type)): Turn into a template,
+       change parameter type, constrain, add a conversion to __sv_type
+       from the dependent parameter type.
+       (assign(__sv_type, size_type, size_type)): Likewise.
+       (insert(size_type, __sv_type, size_type, size_type)): Likewise.
+       (replace(size_type, size_type, __sv_type, size_type, size_type)):
+       Likewise.
+       (compare(size_type, size_type,__sv_type, size_type, size_type)):
+       Likewise.
+       * testsuite/21_strings/basic_string/lwg2758.cc: New.
+
 2016-08-06  Jonathan Wakely  <jwakely@redhat.com>
 
        * doc/xml/manual/status_cxx2017.xml: Update status table.

diff --git a/libstdc++-v3/include/bits/basic_string.h b/libstdc++-v3/include/bits/basic_string.h
index 59f1c64..89e2100 100644 (file)
--- a/libstdc++-v3/include/bits/basic_string.h
+++ b/libstdc++-v3/include/bits/basic_string.h
@@ -1227,9 +1227,13 @@ _GLIBCXX_BEGIN_NAMESPACE_CXX11
        *  @param __n   The number of characters to append from the string_view.
        *  @return  Reference to this string.
        */
-      basic_string& append(__sv_type __sv,
+      template <typename _Tp,
+               enable_if_t<is_convertible_v<const _Tp&, __sv_type>,
+                           bool> = true>
+      basic_string& append(const _Tp& __svt,
                           size_type __pos, size_type __n = npos)
       {
+       __sv_type __sv = __svt;
        return _M_append(__sv.data()
                         + __sv._M_check(__pos, "basic_string::append"),
                         __sv._M_limit(__pos, __n));
@@ -1392,10 +1396,14 @@ _GLIBCXX_BEGIN_NAMESPACE_CXX11
        *  @param __n  The number of characters to assign.
        *  @return  Reference to this string.
        */
+      template <typename _Tp,
+               enable_if_t<is_convertible_v<const _Tp&, __sv_type>,
+                           bool> = true>
       basic_string&
-      assign(__sv_type __sv,
+      assign(const _Tp& __svt,
             size_type __pos, size_type __n = npos)
       {
+       __sv_type __sv = __svt;
        return _M_replace(size_type(0), this->size(), __sv.data()
                          + __sv._M_check(__pos, "basic_string::assign"),
                          __sv._M_limit(__pos, __n));
@@ -1652,9 +1660,13 @@ _GLIBCXX_BEGIN_NAMESPACE_CXX11
        *  @param __n    The number of characters to insert.
        *  @return  Reference to this string.
       */
-      basic_string& insert(size_type __pos1, __sv_type __sv,
+      template <typename _Tp,
+               enable_if_t<is_convertible_v<const _Tp&, __sv_type>,
+                           bool> = true>
+      basic_string& insert(size_type __pos1, const _Tp& __svt,
                           size_type __pos2, size_type __n = npos)
       {
+       __sv_type __sv = __svt;
        return this->replace(__pos1, size_type(0), __sv.data()
                             + __sv._M_check(__pos2, "basic_string::insert"),
                             __sv._M_limit(__pos2, __n));
@@ -2071,10 +2083,14 @@ _GLIBCXX_BEGIN_NAMESPACE_CXX11
        *  @param __n2    The number of characters to insert.
        *  @return  Reference to this string.
       */
+      template <typename _Tp,
+               enable_if_t<is_convertible_v<const _Tp&, __sv_type>,
+                           bool> = true>
       basic_string& replace(size_type __pos1, size_type __n1,
-                           __sv_type __sv,
+                           const _Tp& __svt,
                            size_type __pos2, size_type __n2 = npos)
       {
+       __sv_type __sv = __svt;
        return this->replace(__pos1, __n1, __sv.data()
                             + __sv._M_check(__pos2, "basic_string::replace"),
                             __sv._M_limit(__pos2, __n2));
@@ -2720,10 +2736,14 @@ _GLIBCXX_BEGIN_NAMESPACE_CXX11
        *  @param __n2  The number of characters to compare.
        *  @return  Integer < 0, 0, or > 0.
        */
+      template <typename _Tp,
+               enable_if_t<is_convertible_v<const _Tp&, __sv_type>,
+                           bool> = true>
       int compare(size_type __pos1, size_type __n1,
-                 __sv_type __sv,
+                 const _Tp& __svt,
                  size_type __pos2, size_type __n2 = npos) const
       {
+       __sv_type __sv = __svt;
        return __sv_type(*this)
          .substr(__pos1, __n1).compare(__sv.substr(__pos2, __n2));
       }

diff --git a/libstdc++-v3/testsuite/21_strings/basic_string/lwg2758.cc b/libstdc++-v3/testsuite/21_strings/basic_string/lwg2758.cc
new file mode 100644 (file)
index 0000000..1d29248
--- /dev/null
+++ b/libstdc++-v3/testsuite/21_strings/basic_string/lwg2758.cc
@@ -0,0 +1,46 @@
+// { dg-options "-std=gnu++17" }
+// { dg-do compile }
+
+// Copyright (C) 2016 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/>.
+
+#include <string>
+
+struct CustomString
+{
+  std::string data = "foo";
+  std::string_view data_view = data;
+  operator std::string_view() const {return data_view;}
+};
+
+int main()
+{
+    std::string x;
+    CustomString cs;
+    x.append("foo", 0, 3);
+    x.append(cs, 0, 3);
+    x.assign("foo", 0, 3);
+    x.assign(cs, 0, 3);
+    x.insert(0, "foo", 0, 3);
+    x.insert(0, cs, 0, 3);
+    x = "bar";
+    x.replace(0, 3, "foo", 0, 3);
+    x.replace(0, 3, cs, 0, 3);
+    x = "bar";
+    x.compare(0, 3, "foo", 0, 3);
+    x.compare(0, 3, cs, 0, 3);
+}