1 files changed, 92 insertions, 0 deletions
diff --git a/test/std/input.output/string.streams/stringbuf/stringbuf.virtuals/pbackfail.pass.cpp b/test/std/input.output/string.streams/stringbuf/stringbuf.virtuals/pbackfail.pass.cpp
new file mode 100644
index 000000000000..4af0e63029a7
--- /dev/null
+++ b/test/std/input.output/string.streams/stringbuf/stringbuf.virtuals/pbackfail.pass.cpp
@@ -0,0 +1,92 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+// <sstream>
+
+// template <class charT, class traits = char_traits<charT>, class Allocator = allocator<charT> >
+// class basic_stringbuf
+
+// int_type pbackfail(int_type c = traits::eof());
+
+#include <sstream>
+#include <cassert>
+
+template <class CharT>
+struct testbuf
+    : public std::basic_stringbuf<CharT>
+{
+    typedef std::basic_stringbuf<CharT> base;
+    explicit testbuf(const std::basic_string<CharT>& str,
+                     std::ios_base::openmode which = std::ios_base::in | std::ios_base::out)
+        : base(str, which) {}
+
+    typename base::int_type
+        pbackfail(typename base::int_type c = base::type_traits::eof())
+        {return base::pbackfail(c);}
+
+    void pbump(int n) {base::pbump(n);}
+};
+
+int main()
+{
+    {
+        testbuf<char> sb("123", std::ios_base::in);
+        assert(sb.sgetc() == '1');
+        assert(sb.snextc() == '2');
+        assert(sb.snextc() == '3');
+        assert(sb.sgetc() == '3');
+        assert(sb.snextc() == std::char_traits<char>::eof());
+        assert(sb.pbackfail('3') == '3');
+        assert(sb.pbackfail('3') == std::char_traits<char>::eof());
+        assert(sb.pbackfail('2') == '2');
+        assert(sb.pbackfail(std::char_traits<char>::eof()) != std::char_traits<char>::eof());
+        assert(sb.pbackfail(std::char_traits<char>::eof()) == std::char_traits<char>::eof());
+        assert(sb.str() == "123");
+    }
+    {
+        testbuf<char> sb("123");
+        assert(sb.sgetc() == '1');
+        assert(sb.snextc() == '2');
+        assert(sb.snextc() == '3');
+        assert(sb.sgetc() == '3');
+        assert(sb.snextc() == std::char_traits<char>::eof());
+        assert(sb.pbackfail('3') == '3');
+        assert(sb.pbackfail('3') == '3');
+        assert(sb.pbackfail(std::char_traits<char>::eof()) != std::char_traits<char>::eof());
+        assert(sb.pbackfail(std::char_traits<char>::eof()) == std::char_traits<char>::eof());
+        assert(sb.str() == "133");
+    }
+    {
+        testbuf<wchar_t> sb(L"123", std::ios_base::in);
+        assert(sb.sgetc() == L'1');
+        assert(sb.snextc() == L'2');
+        assert(sb.snextc() == L'3');
+        assert(sb.sgetc() == L'3');
+        assert(sb.snextc() == std::char_traits<wchar_t>::eof());
+        assert(sb.pbackfail(L'3') == L'3');
+        assert(sb.pbackfail(L'3') == std::char_traits<wchar_t>::eof());
+        assert(sb.pbackfail(L'2') == L'2');
+        assert(sb.pbackfail(std::char_traits<wchar_t>::eof()) != std::char_traits<wchar_t>::eof());
+        assert(sb.pbackfail(std::char_traits<wchar_t>::eof()) == std::char_traits<wchar_t>::eof());
+        assert(sb.str() == L"123");
+    }
+    {
+        testbuf<wchar_t> sb(L"123");
+        assert(sb.sgetc() == L'1');
+        assert(sb.snextc() == L'2');
+        assert(sb.snextc() == L'3');
+        assert(sb.sgetc() == L'3');
+        assert(sb.snextc() == std::char_traits<wchar_t>::eof());
+        assert(sb.pbackfail(L'3') == L'3');
+        assert(sb.pbackfail(L'3') == L'3');
+        assert(sb.pbackfail(std::char_traits<wchar_t>::eof()) != std::char_traits<wchar_t>::eof());
+        assert(sb.pbackfail(std::char_traits<wchar_t>::eof()) == std::char_traits<wchar_t>::eof());
+        assert(sb.str() == L"133");
+    }
+}