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Diffstat (limited to 'include/o3tl/temporary.hxx')
| -rw-r--r-- | include/o3tl/temporary.hxx | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/include/o3tl/temporary.hxx b/include/o3tl/temporary.hxx new file mode 100644 index 000000000..7b6c9a1f9 --- /dev/null +++ b/include/o3tl/temporary.hxx @@ -0,0 +1,27 @@ +/* -*- 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_TEMPORARY_HXX +#define INCLUDED_O3TL_TEMPORARY_HXX + +#include <sal/config.h> + +namespace o3tl +{ +// Cast an rvalue to an lvalue. Can be useful if a function parameter is a pointer/reference to T, +// and some call site doesn't need the value beyond the call itself (e.g., in a call like +// std::modf(x, &o3tl::temporary(double())) to obtain the fractional part of x, ignoring the +// integral part). +template <typename T> constexpr T& temporary(T&& x) { return x; } +template <typename T> constexpr T& temporary(T&) = delete; +} + +#endif /* INCLUDED_O3TL_TEMPORARY_HXX */ + +/* vim:set shiftwidth=4 softtabstop=4 expandtab cinoptions=b1,g0,N-s cinkeys+=0=break: */ |