From ed5640d8b587fbcfed7dd7967f3de04b37a76f26 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 7 Apr 2024 11:06:44 +0200 Subject: Adding upstream version 4:7.4.7. Signed-off-by: Daniel Baumann --- include/o3tl/unsafe_downcast.hxx | 35 +++++++++++++++++++++++++++++++++++ 1 file changed, 35 insertions(+) create mode 100644 include/o3tl/unsafe_downcast.hxx (limited to 'include/o3tl/unsafe_downcast.hxx') diff --git a/include/o3tl/unsafe_downcast.hxx b/include/o3tl/unsafe_downcast.hxx new file mode 100644 index 000000000..b49994eff --- /dev/null +++ b/include/o3tl/unsafe_downcast.hxx @@ -0,0 +1,35 @@ +/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4; fill-column: 100 -*- */ +/* + * This file is part of the LibreOffice project. + * + * 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 INCLUDED_O3TL_UNSAFE_DOWNCAST_HXX +#define INCLUDED_O3TL_UNSAFE_DOWNCAST_HXX + +#include +#include + +namespace o3tl +{ +// Do a downcast from polymorphic `BasePtr` to `DerivedPtr` when it is known that `p` is actually +// pointing to an object of derived type (or is a nullptr). This is potentially cheaper than +// dynamic_cast and helps to avoid Coverity warnings about unchecked dynamic_cast. +template +std::enable_if_t< + (std::is_pointer_v< + DerivedPtr> && std::is_pointer_v && std::is_base_of_v, std::remove_pointer_t>), + DerivedPtr> +unsafe_downcast(BasePtr p) +{ + assert(p == nullptr || dynamic_cast(p) != nullptr); + return static_cast(p); +} +} + +#endif + +/* vim:set shiftwidth=4 softtabstop=4 expandtab cinoptions=b1,g0,N-s cinkeys+=0=break: */ -- cgit v1.2.3