Memory.h

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// Copyright Onix Solutions Limited [OnixS]. All rights reserved.
//
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// protected by copyright law and international copyright treaties.
//
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// agreements granting a non-assignable, non-transferable and non-exclusive license 
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// in the Agreement.
//
// Except as otherwise granted within the terms of the Agreement, copying or 
// reproduction of any part of this source code or associated reference material 
// to any other location for further reproduction or redistribution, and any 
// amendments to this copyright notice, are expressly prohibited.
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//
 
#pragma once
 
#include <cstddef>
 
#include <OnixS/eSpeed/MarketData/Itch/Integral.h>
 
ONIXS_ESPEED_ITCH_NAMESPACE_BEGIN

typedef UInt8 Byte;

template
    <
    typename Type
    >
    inline
    void*
    toOpaquePtr(Type* ptr)
{
    return static_cast<void*>(ptr);
}

template
    <
    typename Type
    >
    inline
    const void*
    toOpaquePtr(
        const Type* ptr)
{
    return static_cast<const void*>(ptr);
}

template
    <
    typename Type
    >
    inline
    Byte*
    toByteBlock(
        Type* ptr)
{
    return
        static_cast
        <Byte*>
        (toOpaquePtr(ptr));
}

template
    <
    typename Type
    >
    inline
    const Byte*
    toByteBlock(
        const Type* ptr)
{
    return
        static_cast
        <const Byte*>
        (toOpaquePtr(ptr));
}

template
    <
    typename Type
    >
    inline
    Type*
    advanceByBytes(
        Type* pointer,
        ptrdiff_t distance)
{
    return
        reinterpret_cast<Type*>
        (
            toByteBlock(pointer) + distance
            );
}

template
    <
    typename Type
    >
    inline
    Type*
    advanceBackByBytes(
        Type* pointer,
        ptrdiff_t distance)
{
    return
        reinterpret_cast<Type*>
        (
            toByteBlock(pointer) - distance
            );
}

template
    <
    typename Left,
    typename Right
    >
    inline
    ptrdiff_t
    byteDistance(
        Left* left,
        Right* right)
{
    return (
        toByteBlock(left) -
        toByteBlock(right)
        );
}
 
ONIXS_ESPEED_ITCH_NAMESPACE_END