Memory.h

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//
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// in the Agreement.
//
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#pragma once

#include <cstddef>

#include <OnixS/CME/MDH/Integral.h>

ONIXS_CMEMDH_NAMESPACE_BEGIN

/// Alias for Byte. 
typedef UInt8 Byte;

/// Alias for Word. 
typedef UInt16 Word;

/// Alias for Double Word. 
typedef UInt32 DWord;

/// Alias for Quad Word. 
typedef UInt64 QWord;

//

/// Casts data of source type to the data 
/// of target type using C casting rules. 
template
<
    typename Target,
    typename Source
>
inline Target c_cast(Source src)
{
    return (Target)src;
}

/// Makes pointer as opaque one. 
template
<
    typename Type
>
inline 
void* 
toOpaquePtr(Type* ptr)
{
    return static_cast<void*>(ptr);
}

/// Makes pointer as opaque one. 
template
<
    typename Type
>
inline 
const void* 
toOpaquePtr(
    const Type* ptr)
{
    return static_cast<const void*>(ptr);
}

/// Reinterprets pointer to one 
/// referencing to byte block. 
template
<
    typename Type
>
inline 
Byte* 
toByteBlock(
    Type* ptr)
{
    return 
        static_cast
        <Byte*>
        (toOpaquePtr(ptr));
}

/// Reinterprets pointer to one 
/// referencing to byte block. 
template
<
    typename Type
>
inline 
const Byte* 
toByteBlock(
    const Type* ptr)
{
    return 
        static_cast
        <const Byte*>
        (toOpaquePtr(ptr));
}

/// Advances given pointer to a given offset (distance) in bytes. 
template
<
    typename Type
>
inline 
Type*
advanceByBytes(
    Type* pointer, 
    ptrdiff_t distance)
{
    return 
        reinterpret_cast<Type*>
        (
            toByteBlock(pointer) + distance
        );
}

/// Returns pointer which is lower than 
/// given one to a given number of bytes. 
template
<
    typename Type
>
inline 
Type*
advanceBackByBytes(
    Type* pointer, 
    ptrdiff_t distance)
{
    return 
        reinterpret_cast<Type*>
        (
            toByteBlock(pointer) - distance
        );
}

/// Returns distance in bytes between two pointers. 
template
<
    typename Left,
    typename Right
>
inline 
ptrdiff_t 
byteDistance(
    Left* left, 
    Right* right)
{
    return (
        toByteBlock(left) - 
        toByteBlock(right)
    );
}

ONIXS_CMEMDH_NAMESPACE_END