libcxx initial import

llvm-svn: 103490
diff --git a/libcxx/test/strings/basic.string/string.modifiers/string::assign/string.pass.cpp b/libcxx/test/strings/basic.string/string.modifiers/string::assign/string.pass.cpp
new file mode 100644
index 0000000..d9dccb3
--- /dev/null
+++ b/libcxx/test/strings/basic.string/string.modifiers/string::assign/string.pass.cpp
@@ -0,0 +1,50 @@
+//===----------------------------------------------------------------------===//
+//
+// ÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊÊThe LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+// <string>
+
+// basic_string<charT,traits,Allocator>& 
+//   assign(const basic_string<charT,traits>& str);
+
+#include <string>
+#include <cassert>
+
+template <class S>
+void
+test(S s, S str, S expected)
+{
+    s.assign(str);
+    assert(s.__invariants());
+    assert(s == expected);
+}
+
+int main()
+{
+    typedef std::string S;
+    test(S(), S(), S());
+    test(S(), S("12345"), S("12345"));
+    test(S(), S("1234567890"), S("1234567890"));
+    test(S(), S("12345678901234567890"), S("12345678901234567890"));
+
+    test(S("12345"), S(), S());
+    test(S("12345"), S("12345"), S("12345"));
+    test(S("12345"), S("1234567890"), S("1234567890"));
+    test(S("12345"), S("12345678901234567890"), S("12345678901234567890"));
+
+    test(S("1234567890"), S(), S());
+    test(S("1234567890"), S("12345"), S("12345"));
+    test(S("1234567890"), S("1234567890"), S("1234567890"));
+    test(S("1234567890"), S("12345678901234567890"), S("12345678901234567890"));
+
+    test(S("12345678901234567890"), S(), S());
+    test(S("12345678901234567890"), S("12345"), S("12345"));
+    test(S("12345678901234567890"), S("1234567890"), S("1234567890"));
+    test(S("12345678901234567890"), S("12345678901234567890"),
+         S("12345678901234567890"));
+}