LinearAllocator.h

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/*
    Author : Tobias Stein
    Date   : 22nd October, 2016
    File   : LinearAllocator.h
 
    Linear allocator.
 
    All Rights Reserved. (c) Copyright 2016.
*/
 
#pragma once
#ifndef ECS__LINEAR_ALLOC_H__
#define ECS__LINEAR_ALLOC_H__
 
#include "Memory/Allocator/IAllocator.h"
 
namespace ECS { namespace Memory { namespace Allocator {
 
    /*
        Allocates memory in a linear way. 
 
              first          2   3   4
            allocatation     alloaction
                v            v   v   v
        |=================|=====|==|======| .... |
        ^                                        ^
        Initialial                               Last possible
        memory                                   memory address
        address                                  (mem + memSize)
        (mem)
 
 
        memory only can be freed by clearing all allocations
    */
    class ECS_API LinearAllocator : public IAllocator
    {
    public:
 
        LinearAllocator(size_t memSize, const void* mem);
 
        virtual ~LinearAllocator();
 
        virtual void* allocate(size_t size, u8 alignment) override;
        virtual void free(void* p) override;
        virtual void clear() override;
 
    }; // class LineaerAllocator
 
} } } // namespace ECS::Memory::Allocator
 
#endif // ECS__LINEAR_ALLOC_H__