Swap.H

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    Copyright (C) 2017 OpenCFD Ltd.
-------------------------------------------------------------------------------
License
    This file is part of OpenFOAM.
 
    OpenFOAM is free software: you can redistribute it and/or modify it
    under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.
 
    OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
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    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
    for more details.
 
    You should have received a copy of the GNU General Public License
    along with OpenFOAM.  If not, see <http://www.gnu.org/licenses/>.
 
InNamespace
    Foam
 
Description
    Swap arguments as per std::swap, but in Foam namespace.
 
\*---------------------------------------------------------------------------*/
 
#ifndef Swap_H
#define Swap_H
 
#include <type_traits>
#include <utility>
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
namespace Foam
{
 
//- Swap non-array types as per std::swap example, but in Foam namespace.
//  \sa http://www.cplusplus.com/reference/utility/swap/
template<class T>
void Swap(T& a, T& b)
{
    // compile-time resolution with std::enable_if not yet working
    if (std::is_fundamental<T>::value || std::is_pointer<T>::value)
    {
        // Use copy/assign for simple types
        const T tmp = a;
        a = b;
        b = tmp;
    }
    else
    {
        // Use move/assignment
        T tmp(std::move(a));
        a = std::move(b);
        b = std::move(tmp);
    }
}
 
 
//- Swap array types as per std::swap example, but in Foam namespace.
//  \sa http://www.cplusplus.com/reference/utility/swap/
template<class T, size_t N>
void Swap(T (&a)[N], T (&b)[N])
{
    for (size_t i = 0; i < N; ++i)
    {
        Foam::Swap(a[i], b[i]);
    }
}
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace Foam
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#endif
 
// ************************************************************************* //