Debug mode for string. This commit also marks the first time libc++ debug-mode has found a bug (found one in regex). Had to play with extern templates a bit to get this to work since string is heavily used within libc++.dylib.
llvm-svn: 189114
diff --git a/libcxx/test/strings/basic.string/string.access/db_cfront.pass.cpp b/libcxx/test/strings/basic.string/string.access/db_cfront.pass.cpp
new file mode 100644
index 0000000..55e90e3
--- /dev/null
+++ b/libcxx/test/strings/basic.string/string.access/db_cfront.pass.cpp
@@ -0,0 +1,50 @@
+//===----------------------------------------------------------------------===//
+//
+// 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>
+
+// Call front() on empty const container.
+
+#if _LIBCPP_DEBUG2 >= 1
+
+#define _LIBCPP_ASSERT(x, m) ((x) ? (void)0 : std::exit(0))
+
+#include <string>
+#include <cassert>
+#include <iterator>
+#include <exception>
+#include <cstdlib>
+
+#include "../min_allocator.h"
+
+int main()
+{
+ {
+ typedef std::string S;
+ const S s;
+ assert(s.front() == 0);
+ assert(false);
+ }
+#if __cplusplus >= 201103L
+ {
+ typedef std::basic_string<char, std::char_traits<char>, min_allocator<char>> S;
+ const S s;
+ assert(s.front() == 0);
+ assert(false);
+ }
+#endif
+}
+
+#else
+
+int main()
+{
+}
+
+#endif