allocator.hh

// SPDX-FileCopyrightText: Copyright (C) DUNE Project contributors, see file LICENSE.md in module root
// SPDX-License-Identifier: LicenseRef-GPL-2.0-only-with-DUNE-exception
#ifndef DUNE_ISTL_ALLOCATOR_HH
#define DUNE_ISTL_ALLOCATOR_HH
 
#include <memory>
#include <type_traits>
 
#include <dune/common/typetraits.hh>
 
namespace Dune {
 
    template<typename T>
    struct exists{
        static const bool value = true;
    };
 
    template<typename T, typename = void>
    struct DefaultAllocatorTraits
    {
        using type = std::allocator<T>;
    };
 
    template<typename T>
    struct DefaultAllocatorTraits<T, std::void_t<typename T::allocator_type> >
    {
        using type = typename T::allocator_type;
    };
 
    template<typename T>
    struct AllocatorTraits : public DefaultAllocatorTraits<T> {};
 
    template<typename T>
    using AllocatorType = typename AllocatorTraits<T>::type;
 
    template<typename T, typename X>
    using ReboundAllocatorType = typename std::allocator_traits<typename AllocatorTraits<T>::type>::template rebind_alloc<X>;
 
} // end namespace Dune
 
#endif // DUNE_ISTL_ALLOCATOR_HH