AuROXTL/Include/auROXTL/Objects/SOO.hpp

/***
    Copyright (C) 2023 J Reece Wilson (a/k/a "Reece"). All rights reserved.

    File: SOO.hpp
    Date: 2023-1-18
    Author: Reece

    Note: ~~removed~~ 
    Recovered and fixed up: 2023-3-21
***/
#pragma once

#if defined(_AUROXTL_INTERFACE_SOO_FORCE_NO_STRING)
#define _AUROXTL_INTERFACE_SOO_TYPE2NAME(Type) ""
#else
#define _AUROXTL_INTERFACE_SOO_TYPE2NAME(Type) #Type
#endif

#define _AUROXTL_INTERRFACE_SOO_THIS(FullType) (reinterpret_cast<FullType *>(this))

#define _AUROXTL_INTERRFACE_SOO_EMITTER_0(a) AU_EMIT_FIRST a AU_EMIT_SECOND a
#define _AUROXTL_INTERRFACE_SOO_EMITTER_1(a) , AU_EMIT_FIRST a AU_EMIT_SECOND a
#define _AUROXTL_INTERRFACE_SOO_EMITTER_2(a) AU_EMIT_SECOND a
#define _AUROXTL_INTERRFACE_SOO_EMITTER_3(a) , AU_EMIT_SECOND a

#if !defined(_ZAUFE_FE_1_FIRST)
#define _ZAUFE_FE_1_FIRST(...)
#endif

#define AUROXTL_INTERFACE_SOO_HDR_(vis, type, maxSize, ...)              \
        protected:                                                       \
            char padding[maxSize] {};                                    \
            inline type(std::nullptr_t)                                  \
            {}                                                           \
        public:                                                          \
            static const AuUInt kSSOPaddedSize = maxSize;                \
            static const AuUInt kSSORealSize;                            \
            vis type(AU_FOR_EACH_FIRST(_AUROXTL_INTERRFACE_SOO_EMITTER_0, _AUROXTL_INTERRFACE_SOO_EMITTER_1, ## __VA_ARGS__, (AuUInt32, uSOOSize = kSSOPaddedSize)));\
            vis ~type();

#define AUROXTL_INTERFACE_SOO_HDR_EX(vis, Type, extends, targetSize, ...)           \
struct Type ## SOO                                                                  \
{                                                                                   \
    AUROXTL_INTERFACE_SOO_HDR_(vis, Type ## SOO, targetSize, ## __VA_ARGS__)        \
    inline auto operator ->()                                                       \
    {                                                                               \
        if constexpr (std::is_const_v<typename AuRemovePointer_t<decltype(this)>>)  \
        {                                                                           \
            return (const extends *)this->padding;                                  \
                                                                                    \
        }                                                                           \
        else                                                                        \
        {                                                                           \
            return ( extends *)this->padding;                                       \
        }                                                                           \
    }                                                                               \
                                                                                    \
    inline auto AsPointer()                                                         \
    {                                                                               \
        if constexpr (std::is_const_v<typename AuRemovePointer_t<decltype(this)>>)  \
        {                                                                           \
            return (const extends *)this->padding;                                  \
        }                                                                           \
        else                                                                        \
        {                                                                           \
            return (extends *)this->padding;                                        \
        }                                                                           \
    }                                                                               \
    inline operator extends&()                                                      \
    {                                                                               \
        return *(extends *)this->padding;                                           \
    }                                                                               \
    inline operator extends*()                                                      \
    {                                                                               \
        return (extends *)this->padding;                                            \
    }                                                                               \
    inline operator const extends&() const                                          \
    {                                                                               \
        return *(const extends *)this->padding;                                     \
    }                                                                               \
    inline operator const extends*() const                                          \
    {                                                                               \
        return (const extends *)this->padding;                                      \
    }                                                                               \
};                                                                                  \
                                                                                    \
using Type ## SOO_t = Type ## SOO;                                                  \
using Type = Type ## SOO;

#define AUROXTL_INTERFACE_SOO_HDR(Type, extends, targetSize, ...)        \
    AUROXTL_INTERFACE_SOO_HDR_EX(, Type, extends, targetSize, ## __VA_ARGS__)

#define AUROXTL_INTERFACE_SOO_SRC_EX(vis, Type, FullType, ...)           \
vis Type ## SOO::Type ## SOO(AU_FOR_EACH_FIRST(_AUROXTL_INTERRFACE_SOO_EMITTER_0, _AUROXTL_INTERRFACE_SOO_EMITTER_1, ## __VA_ARGS__, (AuUInt32, uSize))) \
{                                                                        \
    if (kSSORealSize > uSize)                                            \
    {                                                                    \
        AuMemoryPanic("SOO out of overhead: "                            \
                      _AUROXTL_INTERFACE_SOO_TYPE2NAME(Type));           \
    }                                                                    \
                                                                         \
    {                                                                    \
        new (_AUROXTL_INTERRFACE_SOO_THIS(FullType)) FullType(AU_FOR_EACH_FIRST(_AUROXTL_INTERRFACE_SOO_EMITTER_2, _AUROXTL_INTERRFACE_SOO_EMITTER_3, ## __VA_ARGS__)); \
    }                                                                    \
}                                                                        \
                                                                         \
vis Type ## SOO::~ Type ## SOO()                                         \
{                                                                        \
    _AUROXTL_INTERRFACE_SOO_THIS(FullType)->~FullType();                 \
}                                                                        \
const AuUInt Type ## SOO::kSSORealSize = sizeof(FullType);



#define AUROXTL_INTERFACE_SOO_SRC(Type, FullType, ...)             \
    AUROXTL_INTERFACE_SOO_SRC_EX(, Type, FullType, ##__VA_ARGS__)

#if !defined(AU_SHARED_API_SOO)
#define AU_SHARED_API_SOO(name, size, type, ...)  \
        AU_SHARED_API_EX(, name, type, ##__VA_ARGS__) \
        AUROXTL_INTERFACE_SOO_HDR(name, type, size)
#endif

#if !defined(AU_SHARED_API_SOO_2)
#define AU_SHARED_API_SOO_2(name, size, type, ctr, ...)  \
        AU_SHARED_API_EX(, name, type, ##__VA_ARGS__) \
        AUROXTL_INTERFACE_SOO_HDR(name, type, size, AU_WHAT ctr)
#endif