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-==========
-Debug Mode
-==========
-
-.. contents::
-   :local:
-
-.. _using-debug-mode:
-
-Using Debug Mode
-================
-
-Libc++ provides a debug mode that enables assertions meant to detect incorrect
-usage of the standard library. By default these assertions are disabled but
-they can be enabled using the ``_LIBCPP_DEBUG`` macro.
-
-**_LIBCPP_DEBUG** Macro
------------------------
-
-**_LIBCPP_DEBUG**:
-  This macro is used to enable assertions and iterator debugging checks within
-  libc++. By default it is undefined.
-
-  **Values**: ``0``, ``1``
-
-  Defining ``_LIBCPP_DEBUG`` to ``0`` or greater enables most of libc++'s
-  assertions. Defining ``_LIBCPP_DEBUG`` to ``1`` enables "iterator debugging"
-  which provides additional assertions about the validity of iterators used by
-  the program.
-
-  Note that this option has no effect on libc++'s ABI
-
-**_LIBCPP_DEBUG_USE_EXCEPTIONS**:
-  When this macro is defined ``_LIBCPP_ASSERT`` failures throw
-  ``__libcpp_debug_exception`` instead of aborting. Additionally this macro
-  disables exception specifications on functions containing ``_LIBCPP_ASSERT``
-  checks. This allows assertion failures to correctly throw through these
-  functions.
-
-Handling Assertion Failures
----------------------------
-
-When a debug assertion fails the assertion handler is called via the
-``std::__libcpp_debug_function`` function pointer. It is possible to override
-this function pointer using a different handler function. Libc++ provides two
-different assertion handlers, the default handler
-``std::__libcpp_abort_debug_handler`` which aborts the program, and
-``std::__libcpp_throw_debug_handler`` which throws an instance of
-``std::__libcpp_debug_exception``. Libc++ can be changed to use the throwing
-assertion handler as follows:
-
-.. code-block:: cpp
-
-  #define _LIBCPP_DEBUG 1
-  #include <string>
-  int main() {
-    std::__libcpp_debug_function = std::__libcpp_throw_debug_function;
-    try {
-      std::string::iterator bad_it;
-      std::string str("hello world");
-      str.insert(bad_it, '!'); // causes debug assertion
-    } catch (std::__libcpp_debug_exception const&) {
-      return EXIT_SUCCESS;
-    }
-    return EXIT_FAILURE;
-  }
-
-Debug Mode Checks
-=================
-
-Libc++'s debug mode offers two levels of checking. The first enables various
-precondition checks throughout libc++. The second additionally enables
-"iterator debugging" which checks the validity of iterators used by the program.
-
-Basic Checks
-============
-
-These checks are enabled when ``_LIBCPP_DEBUG`` is defined to either 0 or 1.
-
-The following checks are enabled by ``_LIBCPP_DEBUG``:
-
-  * FIXME: Update this list
-
-Iterator Debugging Checks
-=========================
-
-These checks are enabled when ``_LIBCPP_DEBUG`` is defined to 1.
-
-The following containers and STL classes support iterator debugging:
-
-  * ``std::string``
-  * ``std::vector<T>`` (``T != bool``)
-  * ``std::list``
-  * ``std::unordered_map``
-  * ``std::unordered_multimap``
-  * ``std::unordered_set``
-  * ``std::unordered_multiset``
-
-The remaining containers do not currently support iterator debugging.
-Patches welcome.