vendor/libc++/libc++-release_370-r246257

5 files changed, 638 insertions, 0 deletions

diff --git a/test/std/strings/basic.string/string.nonmembers/string_op+/char_string.pass.cpp b/test/std/strings/basic.string/string.nonmembers/string_op+/char_string.pass.cpp
new file mode 100644
index 000000000000..23a89c6fc8fb
--- /dev/null
+++ b/test/std/strings/basic.string/string.nonmembers/string_op+/char_string.pass.cpp
@@ -0,0 +1,80 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <string>
+
+// template<class charT, class traits, class Allocator>
+//   basic_string<charT,traits,Allocator>
+//   operator+(charT lhs, const basic_string<charT,traits,Allocator>& rhs);
+
+// template<class charT, class traits, class Allocator>
+//   basic_string<charT,traits,Allocator>&&
+//   operator+(charT lhs, basic_string<charT,traits,Allocator>&& rhs);
+
+#include <string>
+#include <utility>
+#include <cassert>
+
+#include "min_allocator.h"
+
+template <class S>
+void
+test0(typename S::value_type lhs, const S& rhs, const S& x)
+{
+    assert(lhs + rhs == x);
+}
+
+#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
+
+template <class S>
+void
+test1(typename S::value_type lhs, S&& rhs, const S& x)
+{
+    assert(lhs + move(rhs) == x);
+}
+
+#endif  // _LIBCPP_HAS_NO_RVALUE_REFERENCES
+
+int main()
+{
+    {
+    typedef std::string S;
+    test0('a', S(""), S("a"));
+    test0('a', S("12345"), S("a12345"));
+    test0('a', S("1234567890"), S("a1234567890"));
+    test0('a', S("12345678901234567890"), S("a12345678901234567890"));
+    
+#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
+
+    test1('a', S(""), S("a"));
+    test1('a', S("12345"), S("a12345"));
+    test1('a', S("1234567890"), S("a1234567890"));
+    test1('a', S("12345678901234567890"), S("a12345678901234567890"));
+
+#endif  // _LIBCPP_HAS_NO_RVALUE_REFERENCES
+    }
+#if __cplusplus >= 201103L
+    {
+    typedef std::basic_string<char, std::char_traits<char>, min_allocator<char>> S;
+    test0('a', S(""), S("a"));
+    test0('a', S("12345"), S("a12345"));
+    test0('a', S("1234567890"), S("a1234567890"));
+    test0('a', S("12345678901234567890"), S("a12345678901234567890"));
+    
+#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
+
+    test1('a', S(""), S("a"));
+    test1('a', S("12345"), S("a12345"));
+    test1('a', S("1234567890"), S("a1234567890"));
+    test1('a', S("12345678901234567890"), S("a12345678901234567890"));
+
+#endif  // _LIBCPP_HAS_NO_RVALUE_REFERENCES
+    }
+#endif
+}
diff --git a/test/std/strings/basic.string/string.nonmembers/string_op+/pointer_string.pass.cpp b/test/std/strings/basic.string/string.nonmembers/string_op+/pointer_string.pass.cpp
new file mode 100644
index 000000000000..665e86f2c239
--- /dev/null
+++ b/test/std/strings/basic.string/string.nonmembers/string_op+/pointer_string.pass.cpp
@@ -0,0 +1,128 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <string>
+
+// template<class charT, class traits, class Allocator>
+//   basic_string<charT,traits,Allocator>
+//   operator+(const charT* lhs, const basic_string<charT,traits,Allocator>& rhs);
+
+// template<class charT, class traits, class Allocator>
+//   basic_string<charT,traits,Allocator>&&
+//   operator+(const charT* lhs, basic_string<charT,traits,Allocator>&& rhs);
+
+#include <string>
+#include <utility>
+#include <cassert>
+
+#include "min_allocator.h"
+
+template <class S>
+void
+test0(const typename S::value_type* lhs, const S& rhs, const S& x)
+{
+    assert(lhs + rhs == x);
+}
+
+#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
+
+template <class S>
+void
+test1(const typename S::value_type* lhs, S&& rhs, const S& x)
+{
+    assert(lhs + move(rhs) == x);
+}
+
+#endif  // _LIBCPP_HAS_NO_RVALUE_REFERENCES
+
+int main()
+{
+    {
+    typedef std::string S;
+    test0("", S(""), S(""));
+    test0("", S("12345"), S("12345"));
+    test0("", S("1234567890"), S("1234567890"));
+    test0("", S("12345678901234567890"), S("12345678901234567890"));
+    test0("abcde", S(""), S("abcde"));
+    test0("abcde", S("12345"), S("abcde12345"));
+    test0("abcde", S("1234567890"), S("abcde1234567890"));
+    test0("abcde", S("12345678901234567890"), S("abcde12345678901234567890"));
+    test0("abcdefghij", S(""), S("abcdefghij"));
+    test0("abcdefghij", S("12345"), S("abcdefghij12345"));
+    test0("abcdefghij", S("1234567890"), S("abcdefghij1234567890"));
+    test0("abcdefghij", S("12345678901234567890"), S("abcdefghij12345678901234567890"));
+    test0("abcdefghijklmnopqrst", S(""), S("abcdefghijklmnopqrst"));
+    test0("abcdefghijklmnopqrst", S("12345"), S("abcdefghijklmnopqrst12345"));
+    test0("abcdefghijklmnopqrst", S("1234567890"), S("abcdefghijklmnopqrst1234567890"));
+    test0("abcdefghijklmnopqrst", S("12345678901234567890"), S("abcdefghijklmnopqrst12345678901234567890"));
+
+#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
+
+    test1("", S(""), S(""));
+    test1("", S("12345"), S("12345"));
+    test1("", S("1234567890"), S("1234567890"));
+    test1("", S("12345678901234567890"), S("12345678901234567890"));
+    test1("abcde", S(""), S("abcde"));
+    test1("abcde", S("12345"), S("abcde12345"));
+    test1("abcde", S("1234567890"), S("abcde1234567890"));
+    test1("abcde", S("12345678901234567890"), S("abcde12345678901234567890"));
+    test1("abcdefghij", S(""), S("abcdefghij"));
+    test1("abcdefghij", S("12345"), S("abcdefghij12345"));
+    test1("abcdefghij", S("1234567890"), S("abcdefghij1234567890"));
+    test1("abcdefghij", S("12345678901234567890"), S("abcdefghij12345678901234567890"));
+    test1("abcdefghijklmnopqrst", S(""), S("abcdefghijklmnopqrst"));
+    test1("abcdefghijklmnopqrst", S("12345"), S("abcdefghijklmnopqrst12345"));
+    test1("abcdefghijklmnopqrst", S("1234567890"), S("abcdefghijklmnopqrst1234567890"));
+    test1("abcdefghijklmnopqrst", S("12345678901234567890"), S("abcdefghijklmnopqrst12345678901234567890"));
+
+#endif  // _LIBCPP_HAS_NO_RVALUE_REFERENCES
+    }
+#if __cplusplus >= 201103L
+    {
+    typedef std::basic_string<char, std::char_traits<char>, min_allocator<char>> S;
+    test0("", S(""), S(""));
+    test0("", S("12345"), S("12345"));
+    test0("", S("1234567890"), S("1234567890"));
+    test0("", S("12345678901234567890"), S("12345678901234567890"));
+    test0("abcde", S(""), S("abcde"));
+    test0("abcde", S("12345"), S("abcde12345"));
+    test0("abcde", S("1234567890"), S("abcde1234567890"));
+    test0("abcde", S("12345678901234567890"), S("abcde12345678901234567890"));
+    test0("abcdefghij", S(""), S("abcdefghij"));
+    test0("abcdefghij", S("12345"), S("abcdefghij12345"));
+    test0("abcdefghij", S("1234567890"), S("abcdefghij1234567890"));
+    test0("abcdefghij", S("12345678901234567890"), S("abcdefghij12345678901234567890"));
+    test0("abcdefghijklmnopqrst", S(""), S("abcdefghijklmnopqrst"));
+    test0("abcdefghijklmnopqrst", S("12345"), S("abcdefghijklmnopqrst12345"));
+    test0("abcdefghijklmnopqrst", S("1234567890"), S("abcdefghijklmnopqrst1234567890"));
+    test0("abcdefghijklmnopqrst", S("12345678901234567890"), S("abcdefghijklmnopqrst12345678901234567890"));
+
+#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
+
+    test1("", S(""), S(""));
+    test1("", S("12345"), S("12345"));
+    test1("", S("1234567890"), S("1234567890"));
+    test1("", S("12345678901234567890"), S("12345678901234567890"));
+    test1("abcde", S(""), S("abcde"));
+    test1("abcde", S("12345"), S("abcde12345"));
+    test1("abcde", S("1234567890"), S("abcde1234567890"));
+    test1("abcde", S("12345678901234567890"), S("abcde12345678901234567890"));
+    test1("abcdefghij", S(""), S("abcdefghij"));
+    test1("abcdefghij", S("12345"), S("abcdefghij12345"));
+    test1("abcdefghij", S("1234567890"), S("abcdefghij1234567890"));
+    test1("abcdefghij", S("12345678901234567890"), S("abcdefghij12345678901234567890"));
+    test1("abcdefghijklmnopqrst", S(""), S("abcdefghijklmnopqrst"));
+    test1("abcdefghijklmnopqrst", S("12345"), S("abcdefghijklmnopqrst12345"));
+    test1("abcdefghijklmnopqrst", S("1234567890"), S("abcdefghijklmnopqrst1234567890"));
+    test1("abcdefghijklmnopqrst", S("12345678901234567890"), S("abcdefghijklmnopqrst12345678901234567890"));
+
+#endif  // _LIBCPP_HAS_NO_RVALUE_REFERENCES
+    }
+#endif
+}
diff --git a/test/std/strings/basic.string/string.nonmembers/string_op+/string_char.pass.cpp b/test/std/strings/basic.string/string.nonmembers/string_op+/string_char.pass.cpp
new file mode 100644
index 000000000000..12903fe8118e
--- /dev/null
+++ b/test/std/strings/basic.string/string.nonmembers/string_op+/string_char.pass.cpp
@@ -0,0 +1,80 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <string>
+
+// template<class charT, class traits, class Allocator>
+//   basic_string<charT,traits,Allocator>
+//   operator+(const basic_string<charT,traits,Allocator>& lhs, charT rhs);
+
+// template<class charT, class traits, class Allocator>
+//   basic_string<charT,traits,Allocator>&&
+//   operator+(basic_string<charT,traits,Allocator>&& lhs, charT rhs);
+
+#include <string>
+#include <utility>
+#include <cassert>
+
+#include "min_allocator.h"
+
+template <class S>
+void
+test0(const S& lhs, typename S::value_type rhs, const S& x)
+{
+    assert(lhs + rhs == x);
+}
+
+#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
+
+template <class S>
+void
+test1(S&& lhs, typename S::value_type rhs, const S& x)
+{
+    assert(move(lhs) + rhs == x);
+}
+
+#endif  // _LIBCPP_HAS_NO_RVALUE_REFERENCES
+
+int main()
+{
+    {
+    typedef std::string S;
+    test0(S(""), '1', S("1"));
+    test0(S("abcde"), '1', S("abcde1"));
+    test0(S("abcdefghij"), '1', S("abcdefghij1"));
+    test0(S("abcdefghijklmnopqrst"), '1', S("abcdefghijklmnopqrst1"));
+
+#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
+
+    test1(S(""), '1', S("1"));
+    test1(S("abcde"), '1', S("abcde1"));
+    test1(S("abcdefghij"), '1', S("abcdefghij1"));
+    test1(S("abcdefghijklmnopqrst"), '1', S("abcdefghijklmnopqrst1"));
+
+#endif  // _LIBCPP_HAS_NO_RVALUE_REFERENCES
+    }
+#if __cplusplus >= 201103L
+    {
+    typedef std::basic_string<char, std::char_traits<char>, min_allocator<char>> S;
+    test0(S(""), '1', S("1"));
+    test0(S("abcde"), '1', S("abcde1"));
+    test0(S("abcdefghij"), '1', S("abcdefghij1"));
+    test0(S("abcdefghijklmnopqrst"), '1', S("abcdefghijklmnopqrst1"));
+
+#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
+
+    test1(S(""), '1', S("1"));
+    test1(S("abcde"), '1', S("abcde1"));
+    test1(S("abcdefghij"), '1', S("abcdefghij1"));
+    test1(S("abcdefghijklmnopqrst"), '1', S("abcdefghijklmnopqrst1"));
+
+#endif  // _LIBCPP_HAS_NO_RVALUE_REFERENCES
+    }
+#endif
+}
diff --git a/test/std/strings/basic.string/string.nonmembers/string_op+/string_pointer.pass.cpp b/test/std/strings/basic.string/string.nonmembers/string_op+/string_pointer.pass.cpp
new file mode 100644
index 000000000000..63a7b769b787
--- /dev/null
+++ b/test/std/strings/basic.string/string.nonmembers/string_op+/string_pointer.pass.cpp
@@ -0,0 +1,128 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <string>
+
+// template<class charT, class traits, class Allocator>
+//   basic_string<charT,traits,Allocator>
+//   operator+(const basic_string<charT,traits,Allocator>& lhs, const charT* rhs);
+
+// template<class charT, class traits, class Allocator>
+//   basic_string<charT,traits,Allocator>&&
+//   operator+(basic_string<charT,traits,Allocator>&& lhs, const charT* rhs);
+
+#include <string>
+#include <utility>
+#include <cassert>
+
+#include "min_allocator.h"
+
+template <class S>
+void
+test0(const S& lhs, const typename S::value_type* rhs, const S& x)
+{
+    assert(lhs + rhs == x);
+}
+
+#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
+
+template <class S>
+void
+test1(S&& lhs, const typename S::value_type* rhs, const S& x)
+{
+    assert(move(lhs) + rhs == x);
+}
+
+#endif  // _LIBCPP_HAS_NO_RVALUE_REFERENCES
+
+int main()
+{
+    {
+    typedef std::string S;
+    test0(S(""), "", S(""));
+    test0(S(""), "12345", S("12345"));
+    test0(S(""), "1234567890", S("1234567890"));
+    test0(S(""), "12345678901234567890", S("12345678901234567890"));
+    test0(S("abcde"), "", S("abcde"));
+    test0(S("abcde"), "12345", S("abcde12345"));
+    test0(S("abcde"), "1234567890", S("abcde1234567890"));
+    test0(S("abcde"), "12345678901234567890", S("abcde12345678901234567890"));
+    test0(S("abcdefghij"), "", S("abcdefghij"));
+    test0(S("abcdefghij"), "12345", S("abcdefghij12345"));
+    test0(S("abcdefghij"), "1234567890", S("abcdefghij1234567890"));
+    test0(S("abcdefghij"), "12345678901234567890", S("abcdefghij12345678901234567890"));
+    test0(S("abcdefghijklmnopqrst"), "", S("abcdefghijklmnopqrst"));
+    test0(S("abcdefghijklmnopqrst"), "12345", S("abcdefghijklmnopqrst12345"));
+    test0(S("abcdefghijklmnopqrst"), "1234567890", S("abcdefghijklmnopqrst1234567890"));
+    test0(S("abcdefghijklmnopqrst"), "12345678901234567890", S("abcdefghijklmnopqrst12345678901234567890"));
+
+#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
+
+    test1(S(""), "", S(""));
+    test1(S(""), "12345", S("12345"));
+    test1(S(""), "1234567890", S("1234567890"));
+    test1(S(""), "12345678901234567890", S("12345678901234567890"));
+    test1(S("abcde"), "", S("abcde"));
+    test1(S("abcde"), "12345", S("abcde12345"));
+    test1(S("abcde"), "1234567890", S("abcde1234567890"));
+    test1(S("abcde"), "12345678901234567890", S("abcde12345678901234567890"));
+    test1(S("abcdefghij"), "", S("abcdefghij"));
+    test1(S("abcdefghij"), "12345", S("abcdefghij12345"));
+    test1(S("abcdefghij"), "1234567890", S("abcdefghij1234567890"));
+    test1(S("abcdefghij"), "12345678901234567890", S("abcdefghij12345678901234567890"));
+    test1(S("abcdefghijklmnopqrst"), "", S("abcdefghijklmnopqrst"));
+    test1(S("abcdefghijklmnopqrst"), "12345", S("abcdefghijklmnopqrst12345"));
+    test1(S("abcdefghijklmnopqrst"), "1234567890", S("abcdefghijklmnopqrst1234567890"));
+    test1(S("abcdefghijklmnopqrst"), "12345678901234567890", S("abcdefghijklmnopqrst12345678901234567890"));
+
+#endif  // _LIBCPP_HAS_NO_RVALUE_REFERENCES
+    }
+#if __cplusplus >= 201103L
+    {
+    typedef std::basic_string<char, std::char_traits<char>, min_allocator<char>> S;
+    test0(S(""), "", S(""));
+    test0(S(""), "12345", S("12345"));
+    test0(S(""), "1234567890", S("1234567890"));
+    test0(S(""), "12345678901234567890", S("12345678901234567890"));
+    test0(S("abcde"), "", S("abcde"));
+    test0(S("abcde"), "12345", S("abcde12345"));
+    test0(S("abcde"), "1234567890", S("abcde1234567890"));
+    test0(S("abcde"), "12345678901234567890", S("abcde12345678901234567890"));
+    test0(S("abcdefghij"), "", S("abcdefghij"));
+    test0(S("abcdefghij"), "12345", S("abcdefghij12345"));
+    test0(S("abcdefghij"), "1234567890", S("abcdefghij1234567890"));
+    test0(S("abcdefghij"), "12345678901234567890", S("abcdefghij12345678901234567890"));
+    test0(S("abcdefghijklmnopqrst"), "", S("abcdefghijklmnopqrst"));
+    test0(S("abcdefghijklmnopqrst"), "12345", S("abcdefghijklmnopqrst12345"));
+    test0(S("abcdefghijklmnopqrst"), "1234567890", S("abcdefghijklmnopqrst1234567890"));
+    test0(S("abcdefghijklmnopqrst"), "12345678901234567890", S("abcdefghijklmnopqrst12345678901234567890"));
+
+#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
+
+    test1(S(""), "", S(""));
+    test1(S(""), "12345", S("12345"));
+    test1(S(""), "1234567890", S("1234567890"));
+    test1(S(""), "12345678901234567890", S("12345678901234567890"));
+    test1(S("abcde"), "", S("abcde"));
+    test1(S("abcde"), "12345", S("abcde12345"));
+    test1(S("abcde"), "1234567890", S("abcde1234567890"));
+    test1(S("abcde"), "12345678901234567890", S("abcde12345678901234567890"));
+    test1(S("abcdefghij"), "", S("abcdefghij"));
+    test1(S("abcdefghij"), "12345", S("abcdefghij12345"));
+    test1(S("abcdefghij"), "1234567890", S("abcdefghij1234567890"));
+    test1(S("abcdefghij"), "12345678901234567890", S("abcdefghij12345678901234567890"));
+    test1(S("abcdefghijklmnopqrst"), "", S("abcdefghijklmnopqrst"));
+    test1(S("abcdefghijklmnopqrst"), "12345", S("abcdefghijklmnopqrst12345"));
+    test1(S("abcdefghijklmnopqrst"), "1234567890", S("abcdefghijklmnopqrst1234567890"));
+    test1(S("abcdefghijklmnopqrst"), "12345678901234567890", S("abcdefghijklmnopqrst12345678901234567890"));
+
+#endif  // _LIBCPP_HAS_NO_RVALUE_REFERENCES
+    }
+#endif
+}
diff --git a/test/std/strings/basic.string/string.nonmembers/string_op+/string_string.pass.cpp b/test/std/strings/basic.string/string.nonmembers/string_op+/string_string.pass.cpp
new file mode 100644
index 000000000000..318b648d6eb0
--- /dev/null
+++ b/test/std/strings/basic.string/string.nonmembers/string_op+/string_string.pass.cpp
@@ -0,0 +1,222 @@
+//===----------------------------------------------------------------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is dual licensed under the MIT and the University of Illinois Open
+// Source Licenses. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <string>
+
+// template<class charT, class traits, class Allocator>
+//   basic_string<charT,traits,Allocator>
+//   operator+(const basic_string<charT,traits,Allocator>& lhs,
+//             const basic_string<charT,traits,Allocator>& rhs);
+
+// template<class charT, class traits, class Allocator>
+//   basic_string<charT,traits,Allocator>&&
+//   operator+(const basic_string<charT,traits,Allocator>&& lhs,
+//             const basic_string<charT,traits,Allocator>& rhs);
+
+// template<class charT, class traits, class Allocator>
+//   basic_string<charT,traits,Allocator>&&
+//   operator+(const basic_string<charT,traits,Allocator>& lhs,
+//             const basic_string<charT,traits,Allocator>&& rhs);
+
+// template<class charT, class traits, class Allocator>
+//   basic_string<charT,traits,Allocator>&&
+//   operator+(const basic_string<charT,traits,Allocator>&& lhs,
+//             const basic_string<charT,traits,Allocator>&& rhs);
+
+#include <string>
+#include <utility>
+#include <cassert>
+
+#include "min_allocator.h"
+
+template <class S>
+void
+test0(const S& lhs, const S& rhs, const S& x)
+{
+    assert(lhs + rhs == x);
+}
+
+#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
+
+template <class S>
+void
+test1(S&& lhs, const S& rhs, const S& x)
+{
+    assert(move(lhs) + rhs == x);
+}
+
+template <class S>
+void
+test2(const S& lhs, S&& rhs, const S& x)
+{
+    assert(lhs + move(rhs) == x);
+}
+
+template <class S>
+void
+test3(S&& lhs, S&& rhs, const S& x)
+{
+    assert(move(lhs) + move(rhs) == x);
+}
+
+#endif  // _LIBCPP_HAS_NO_RVALUE_REFERENCES
+
+int main()
+{
+    {
+    typedef std::string S;
+    test0(S(""), S(""), S(""));
+    test0(S(""), S("12345"), S("12345"));
+    test0(S(""), S("1234567890"), S("1234567890"));
+    test0(S(""), S("12345678901234567890"), S("12345678901234567890"));
+    test0(S("abcde"), S(""), S("abcde"));
+    test0(S("abcde"), S("12345"), S("abcde12345"));
+    test0(S("abcde"), S("1234567890"), S("abcde1234567890"));
+    test0(S("abcde"), S("12345678901234567890"), S("abcde12345678901234567890"));
+    test0(S("abcdefghij"), S(""), S("abcdefghij"));
+    test0(S("abcdefghij"), S("12345"), S("abcdefghij12345"));
+    test0(S("abcdefghij"), S("1234567890"), S("abcdefghij1234567890"));
+    test0(S("abcdefghij"), S("12345678901234567890"), S("abcdefghij12345678901234567890"));
+    test0(S("abcdefghijklmnopqrst"), S(""), S("abcdefghijklmnopqrst"));
+    test0(S("abcdefghijklmnopqrst"), S("12345"), S("abcdefghijklmnopqrst12345"));
+    test0(S("abcdefghijklmnopqrst"), S("1234567890"), S("abcdefghijklmnopqrst1234567890"));
+    test0(S("abcdefghijklmnopqrst"), S("12345678901234567890"), S("abcdefghijklmnopqrst12345678901234567890"));
+
+#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
+
+    test1(S(""), S(""), S(""));
+    test1(S(""), S("12345"), S("12345"));
+    test1(S(""), S("1234567890"), S("1234567890"));
+    test1(S(""), S("12345678901234567890"), S("12345678901234567890"));
+    test1(S("abcde"), S(""), S("abcde"));
+    test1(S("abcde"), S("12345"), S("abcde12345"));
+    test1(S("abcde"), S("1234567890"), S("abcde1234567890"));
+    test1(S("abcde"), S("12345678901234567890"), S("abcde12345678901234567890"));
+    test1(S("abcdefghij"), S(""), S("abcdefghij"));
+    test1(S("abcdefghij"), S("12345"), S("abcdefghij12345"));
+    test1(S("abcdefghij"), S("1234567890"), S("abcdefghij1234567890"));
+    test1(S("abcdefghij"), S("12345678901234567890"), S("abcdefghij12345678901234567890"));
+    test1(S("abcdefghijklmnopqrst"), S(""), S("abcdefghijklmnopqrst"));
+    test1(S("abcdefghijklmnopqrst"), S("12345"), S("abcdefghijklmnopqrst12345"));
+    test1(S("abcdefghijklmnopqrst"), S("1234567890"), S("abcdefghijklmnopqrst1234567890"));
+    test1(S("abcdefghijklmnopqrst"), S("12345678901234567890"), S("abcdefghijklmnopqrst12345678901234567890"));
+
+    test2(S(""), S(""), S(""));
+    test2(S(""), S("12345"), S("12345"));
+    test2(S(""), S("1234567890"), S("1234567890"));
+    test2(S(""), S("12345678901234567890"), S("12345678901234567890"));
+    test2(S("abcde"), S(""), S("abcde"));
+    test2(S("abcde"), S("12345"), S("abcde12345"));
+    test2(S("abcde"), S("1234567890"), S("abcde1234567890"));
+    test2(S("abcde"), S("12345678901234567890"), S("abcde12345678901234567890"));
+    test2(S("abcdefghij"), S(""), S("abcdefghij"));
+    test2(S("abcdefghij"), S("12345"), S("abcdefghij12345"));
+    test2(S("abcdefghij"), S("1234567890"), S("abcdefghij1234567890"));
+    test2(S("abcdefghij"), S("12345678901234567890"), S("abcdefghij12345678901234567890"));
+    test2(S("abcdefghijklmnopqrst"), S(""), S("abcdefghijklmnopqrst"));
+    test2(S("abcdefghijklmnopqrst"), S("12345"), S("abcdefghijklmnopqrst12345"));
+    test2(S("abcdefghijklmnopqrst"), S("1234567890"), S("abcdefghijklmnopqrst1234567890"));
+    test2(S("abcdefghijklmnopqrst"), S("12345678901234567890"), S("abcdefghijklmnopqrst12345678901234567890"));
+
+    test3(S(""), S(""), S(""));
+    test3(S(""), S("12345"), S("12345"));
+    test3(S(""), S("1234567890"), S("1234567890"));
+    test3(S(""), S("12345678901234567890"), S("12345678901234567890"));
+    test3(S("abcde"), S(""), S("abcde"));
+    test3(S("abcde"), S("12345"), S("abcde12345"));
+    test3(S("abcde"), S("1234567890"), S("abcde1234567890"));
+    test3(S("abcde"), S("12345678901234567890"), S("abcde12345678901234567890"));
+    test3(S("abcdefghij"), S(""), S("abcdefghij"));
+    test3(S("abcdefghij"), S("12345"), S("abcdefghij12345"));
+    test3(S("abcdefghij"), S("1234567890"), S("abcdefghij1234567890"));
+    test3(S("abcdefghij"), S("12345678901234567890"), S("abcdefghij12345678901234567890"));
+    test3(S("abcdefghijklmnopqrst"), S(""), S("abcdefghijklmnopqrst"));
+    test3(S("abcdefghijklmnopqrst"), S("12345"), S("abcdefghijklmnopqrst12345"));
+    test3(S("abcdefghijklmnopqrst"), S("1234567890"), S("abcdefghijklmnopqrst1234567890"));
+    test3(S("abcdefghijklmnopqrst"), S("12345678901234567890"), S("abcdefghijklmnopqrst12345678901234567890"));
+
+#endif  // _LIBCPP_HAS_NO_RVALUE_REFERENCES
+    }
+#if __cplusplus >= 201103L
+    {
+    typedef std::basic_string<char, std::char_traits<char>, min_allocator<char>> S;
+    test0(S(""), S(""), S(""));
+    test0(S(""), S("12345"), S("12345"));
+    test0(S(""), S("1234567890"), S("1234567890"));
+    test0(S(""), S("12345678901234567890"), S("12345678901234567890"));
+    test0(S("abcde"), S(""), S("abcde"));
+    test0(S("abcde"), S("12345"), S("abcde12345"));
+    test0(S("abcde"), S("1234567890"), S("abcde1234567890"));
+    test0(S("abcde"), S("12345678901234567890"), S("abcde12345678901234567890"));
+    test0(S("abcdefghij"), S(""), S("abcdefghij"));
+    test0(S("abcdefghij"), S("12345"), S("abcdefghij12345"));
+    test0(S("abcdefghij"), S("1234567890"), S("abcdefghij1234567890"));
+    test0(S("abcdefghij"), S("12345678901234567890"), S("abcdefghij12345678901234567890"));
+    test0(S("abcdefghijklmnopqrst"), S(""), S("abcdefghijklmnopqrst"));
+    test0(S("abcdefghijklmnopqrst"), S("12345"), S("abcdefghijklmnopqrst12345"));
+    test0(S("abcdefghijklmnopqrst"), S("1234567890"), S("abcdefghijklmnopqrst1234567890"));
+    test0(S("abcdefghijklmnopqrst"), S("12345678901234567890"), S("abcdefghijklmnopqrst12345678901234567890"));
+
+#ifndef _LIBCPP_HAS_NO_RVALUE_REFERENCES
+
+    test1(S(""), S(""), S(""));
+    test1(S(""), S("12345"), S("12345"));
+    test1(S(""), S("1234567890"), S("1234567890"));
+    test1(S(""), S("12345678901234567890"), S("12345678901234567890"));
+    test1(S("abcde"), S(""), S("abcde"));
+    test1(S("abcde"), S("12345"), S("abcde12345"));
+    test1(S("abcde"), S("1234567890"), S("abcde1234567890"));
+    test1(S("abcde"), S("12345678901234567890"), S("abcde12345678901234567890"));
+    test1(S("abcdefghij"), S(""), S("abcdefghij"));
+    test1(S("abcdefghij"), S("12345"), S("abcdefghij12345"));
+    test1(S("abcdefghij"), S("1234567890"), S("abcdefghij1234567890"));
+    test1(S("abcdefghij"), S("12345678901234567890"), S("abcdefghij12345678901234567890"));
+    test1(S("abcdefghijklmnopqrst"), S(""), S("abcdefghijklmnopqrst"));
+    test1(S("abcdefghijklmnopqrst"), S("12345"), S("abcdefghijklmnopqrst12345"));
+    test1(S("abcdefghijklmnopqrst"), S("1234567890"), S("abcdefghijklmnopqrst1234567890"));
+    test1(S("abcdefghijklmnopqrst"), S("12345678901234567890"), S("abcdefghijklmnopqrst12345678901234567890"));
+
+    test2(S(""), S(""), S(""));
+    test2(S(""), S("12345"), S("12345"));
+    test2(S(""), S("1234567890"), S("1234567890"));
+    test2(S(""), S("12345678901234567890"), S("12345678901234567890"));
+    test2(S("abcde"), S(""), S("abcde"));
+    test2(S("abcde"), S("12345"), S("abcde12345"));
+    test2(S("abcde"), S("1234567890"), S("abcde1234567890"));
+    test2(S("abcde"), S("12345678901234567890"), S("abcde12345678901234567890"));
+    test2(S("abcdefghij"), S(""), S("abcdefghij"));
+    test2(S("abcdefghij"), S("12345"), S("abcdefghij12345"));
+    test2(S("abcdefghij"), S("1234567890"), S("abcdefghij1234567890"));
+    test2(S("abcdefghij"), S("12345678901234567890"), S("abcdefghij12345678901234567890"));
+    test2(S("abcdefghijklmnopqrst"), S(""), S("abcdefghijklmnopqrst"));
+    test2(S("abcdefghijklmnopqrst"), S("12345"), S("abcdefghijklmnopqrst12345"));
+    test2(S("abcdefghijklmnopqrst"), S("1234567890"), S("abcdefghijklmnopqrst1234567890"));
+    test2(S("abcdefghijklmnopqrst"), S("12345678901234567890"), S("abcdefghijklmnopqrst12345678901234567890"));
+
+    test3(S(""), S(""), S(""));
+    test3(S(""), S("12345"), S("12345"));
+    test3(S(""), S("1234567890"), S("1234567890"));
+    test3(S(""), S("12345678901234567890"), S("12345678901234567890"));
+    test3(S("abcde"), S(""), S("abcde"));
+    test3(S("abcde"), S("12345"), S("abcde12345"));
+    test3(S("abcde"), S("1234567890"), S("abcde1234567890"));
+    test3(S("abcde"), S("12345678901234567890"), S("abcde12345678901234567890"));
+    test3(S("abcdefghij"), S(""), S("abcdefghij"));
+    test3(S("abcdefghij"), S("12345"), S("abcdefghij12345"));
+    test3(S("abcdefghij"), S("1234567890"), S("abcdefghij1234567890"));
+    test3(S("abcdefghij"), S("12345678901234567890"), S("abcdefghij12345678901234567890"));
+    test3(S("abcdefghijklmnopqrst"), S(""), S("abcdefghijklmnopqrst"));
+    test3(S("abcdefghijklmnopqrst"), S("12345"), S("abcdefghijklmnopqrst12345"));
+    test3(S("abcdefghijklmnopqrst"), S("1234567890"), S("abcdefghijklmnopqrst1234567890"));
+    test3(S("abcdefghijklmnopqrst"), S("12345678901234567890"), S("abcdefghijklmnopqrst12345678901234567890"));
+
+#endif  // _LIBCPP_HAS_NO_RVALUE_REFERENCES
+    }
+#endif
+}