LibreOffice Module o3tl (master)  1
temporary.hxx
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1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4; fill-column: 100 -*- */
2 /*
3  * This file is part of the LibreOffice project.
4  *
5  * This Source Code Form is subject to the terms of the Mozilla Public
6  * License, v. 2.0. If a copy of the MPL was not distributed with this
7  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
8  */
9 
10 #ifndef INCLUDED_O3TL_TEMPORARY_HXX
11 #define INCLUDED_O3TL_TEMPORARY_HXX
12 
13 #include <sal/config.h>
14 
15 namespace o3tl
16 {
17 // Cast an rvalue to an lvalue. Can be useful if a function parameter is a pointer/reference to T,
18 // and some call site doesn't need the value beyond the call itself (e.g., in a call like
19 // std::modf(x, &o3tl::temporary(double())) to obtain the fractional part of x, ignoring the
20 // integral part).
21 template <typename T> constexpr T& temporary(T&& x) { return x; }
22 template <typename T> constexpr T& temporary(T&) = delete;
23 }
24 
25 #endif /* INCLUDED_O3TL_TEMPORARY_HXX */
26 
27 /* vim:set shiftwidth=4 softtabstop=4 expandtab cinoptions=b1,g0,N-s cinkeys+=0=break: */
float x
constexpr T & temporary(T &&x)
Definition: temporary.hxx:21