mn_basic_allocator_stack.hpp

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/*
*This file is part of the Mini Thread Library (https://github.com/RoseLeBlood/MiniThread ).
*Copyright (c) 2018 Amber-Sophia Schroeck
*
*The Mini Thread Library is free software; you can redistribute it and/or modify
*it under the terms of the GNU Lesser General Public License as published by
*the Free Software Foundation, version 3, or (at your option) any later version.
 
*The Mini Thread Library is distributed in the hope that it will be useful, but
*WITHOUT ANY WARRANTY; without even the implied warranty of
*MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
*General Public License for more details.
*
*You should have received a copy of the GNU Lesser General Public
*License along with the Mini Thread  Library; if not, see
*<https://www.gnu.org/licenses/>.
*/
#ifndef __MINILIB_ALLOCATOR_STACK_H__
#define __MINILIB_ALLOCATOR_STACK_H__
 
#include "../mn_config.hpp"
 
#include "mn_basic_allocator.hpp"
#include "mn_allocator_typetraits.hpp"
 
namespace mn {
    namespace memory {
 
        template <int TBUFFERSIZE>
        class basic_allocator_stack_impl {
        public:
            using allocator_category = std_allocator_tag();
            using is_thread_safe = std::false_type  ;
 
            static void first() noexcept { }
 
            static void* allocate(size_t size, size_t alignment) noexcept {
                MN_UNUSED_VARIABLE(alignment);
 
                if(m_bufferTop < TBUFFERSIZE) {
                    if( (m_bufferTop+size) <= TBUFFERSIZE) {
                        char* ret = &m_aBuffer[0] + m_bufferTop;
                        m_bufferTop += size;
 
                        return (void*)ret;
                    }
                }
                return nullptr;
            }
 
            static void deallocate(void* ptr, size_t size, size_t alignment) noexcept {
                MN_UNUSED_VARIABLE(size);
                MN_UNUSED_VARIABLE(alignment);
                MN_UNUSED_VARIABLE(ptr);
            }
 
            static size_t max_node_size()  {
                return size_t(-1);
            }
            static size_t get_max_alocator_size()  {
                return __SIZE_MAX__;
            }
        private:
            static size_t          m_bufferTop;
            static char*           m_aBuffer[TBUFFERSIZE];
        };
 
        template <int TBUFFERSIZE>
        size_t basic_allocator_stack_impl<TBUFFERSIZE>::m_bufferTop = 0;
        template <int TBUFFERSIZE>
        char* basic_allocator_stack_impl<TBUFFERSIZE>::m_aBuffer[TBUFFERSIZE];
 
        template <int TBUFFERSIZE, class TFilter = basic_allocator_filter>
        using stack_allocator = basic_allocator<basic_allocator_stack_impl<TBUFFERSIZE>, TFilter>;
 
    }
}
 
 
 
#endif // __MINILIB_ALLOCATOR_STACK_H__