1 files changed, 28 insertions, 0 deletions
diff --git a/libcxx/test/std/input.output/iostreams.base/fpos/fpos.operations/subtraction.pass.cpp b/libcxx/test/std/input.output/iostreams.base/fpos/fpos.operations/subtraction.pass.cpp
new file mode 100644
index 00000000000..f9e6513e4a4
--- /dev/null
+++ b/libcxx/test/std/input.output/iostreams.base/fpos/fpos.operations/subtraction.pass.cpp
@@ -0,0 +1,28 @@
+//===----------------------------------------------------------------------===//
+//
+//                     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.
+//
+//===----------------------------------------------------------------------===//
+
+// <ios>
+
+// template <class StateT> class fpos
+
+// Subraction with offset
+
+#include <ios>
+#include <cassert>
+
+int main()
+{
+    typedef std::fpos<std::mbstate_t> P;
+    P p(11);
+    std::streamoff o(6);
+    P q = p - o;
+    assert(q == P(5));
+    p -= o;
+    assert(p == q);
+}