office-gobmx/include/o3tl/temporary.hxx
Stephan Bergmann 649313625b New o3tl::temporary to simplify calls of std::modf
...that ignore the out-parameter integral part

Change-Id: I05f07c1a8909023232f8aecf75ea5541d4eb81ca
Reviewed-on: https://gerrit.libreoffice.org/54474
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>
Tested-by: Stephan Bergmann <sbergman@redhat.com>
2018-05-17 21:03:12 +02:00

22 lines
922 B
C++

/* -*- 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/.
*/
#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;
}
/* vim:set shiftwidth=4 softtabstop=4 expandtab cinoptions=b1,g0,N-s cinkeys+=0=break: */