libcxx initial import

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@103490 91177308-0d34-0410-b5e6-96231b3b80d8

test/input.output/iostream.format/input.streams/istream/istream.cons/streambuf.pass.cpp

@@ -0,0 +1,55 @@
+//===----------------------------------------------------------------------===//
+//
+// <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <istream>
+
+// template <class charT, class traits = char_traits<charT> >
+// class basic_istream;
+
+// explicit basic_istream(basic_streambuf<charT,traits>* sb);
+
+#include <istream>
+#include <cassert>
+
+template <class CharT>
+struct testbuf
+    : public std::basic_streambuf<CharT>
+{
+    testbuf() {}
+};
+
+int main()
+{
+    {
+        testbuf<char> sb;
+        std::basic_istream<char> is(&sb);
+        assert(is.rdbuf() == &sb);
+        assert(is.tie() == 0);
+        assert(is.fill() == ' ');
+        assert(is.rdstate() == is.goodbit);
+        assert(is.exceptions() == is.goodbit);
+        assert(is.flags() == (is.skipws | is.dec));
+        assert(is.precision() == 6);
+        assert(is.getloc().name() == "C");
+        assert(is.gcount() == 0);
+    }
+    {
+        testbuf<wchar_t> sb;
+        std::basic_istream<wchar_t> is(&sb);
+        assert(is.rdbuf() == &sb);
+        assert(is.tie() == 0);
+        assert(is.fill() == L' ');
+        assert(is.rdstate() == is.goodbit);
+        assert(is.exceptions() == is.goodbit);
+        assert(is.flags() == (is.skipws | is.dec));
+        assert(is.precision() == 6);
+        assert(is.getloc().name() == "C");
+        assert(is.gcount() == 0);
+    }
+}