msvc-stl-wrapper.template.h

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
 * vim: sw=2 ts=8 et :
 */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef mozilla_${HEADER}_h
#define mozilla_${HEADER}_h

#if _HAS_EXCEPTIONS
#  error "STL code can only be used with -fno-exceptions"
#endif

#if defined(__clang__)
// Silence "warning: #include_next is a language extension [-Wgnu-include-next]"
#pragma clang system_header
#endif

// Include mozalloc after the STL header and all other headers it includes
// have been preprocessed.
#if !defined(MOZ_INCLUDE_MOZALLOC_H)
#  define MOZ_INCLUDE_MOZALLOC_H
#  define MOZ_INCLUDE_MOZALLOC_H_FROM_${HEADER}
#endif

#ifdef _DEBUG
// From
//   http://msdn.microsoft.com/en-us/library/aa985982%28VS.80%29.aspx
// and
//   http://msdn.microsoft.com/en-us/library/aa985965%28VS.80%29.aspx
// there appear to be two types of STL container checking.  The
// former is enabled by -D_DEBUG (which is implied by -MDd or -MTd), and
// looks to be full generation/mutation checked iterators as done by
// _GLIBCXX_DEBUG.  The latter appears to just be bounds checking, and
// is enabled by the following macros.  It appears that the _DEBUG
// iterators subsume _SECURE_SCL, and the following settings are
// default anyway, so we'll just leave this commented out.
//#  define _SECURE_SCL 1
//#  define _SECURE_SCL_THROWS 0
#else
// Note: _SECURE_SCL iterators are on by default in opt builds.  We
// could leave them on, but since gcc doesn't, we might as well
// preserve that behavior for perf reasons.  nsTArray is in the same
// camp as gcc.  Can revisit later.
//
// FIXME/bug 551254: because we're not wrapping all the STL headers we
// use, undefining this here can cause some headers to be built with
// iterator checking and others not.  Turning this off until we have a
// better plan.
//#  undef _SECURE_SCL
#endif

#include_next <${HEADER}>

#ifdef MOZ_INCLUDE_MOZALLOC_H_FROM_${HEADER}
// See if we're in code that can use mozalloc.
#  if !defined(NS_NO_XPCOM) && !defined(MOZ_NO_MOZALLOC)
//   In recent versions of MSVC, <new>, which mozalloc.h includes, uses
//   <type_traits> without including it. Before MSVC 17.7, this worked
//   fine because <new> included <exception>, which includes <type_traits>.
//   That is still the case, but it now also includes <cstdlib> before
//   <type_traits>, so when something includes <exception> before <new>,
//   we get here before <type_traits> is included, which ends up not working.
#    include <type_traits>
#    include "mozilla/mozalloc.h"
#  else
#    error "STL code can only be used with infallible ::operator new()"
#  endif
#endif

#endif  // if mozilla_${HEADER}_h