TSdlReal.h

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#pragma once
 
#include "SDL/Introspect/TSdlValue.h"
#include "SDL/Introspect/TSdlOptionalValue.h"
#include "SDL/sdl_helpers.h"
 
#include <Common/assertion.h>
#include <Common/primitive_type.h>
 
#include <type_traits>
#include <string>
#include <utility>
 
namespace ph
{
 
template<typename Owner, typename FloatType = real, typename SdlValueType = TSdlValue<FloatType, Owner>>
class TSdlReal : public SdlValueType
{
    static_assert(std::is_base_of_v<TSdlAbstractValue<FloatType, Owner>, SdlValueType>,
        "SdlValueType should be a subclass of TSdlAbstractValue.");
 
public:
    template<typename ValueType>
    inline TSdlReal(std::string valueName, ValueType Owner::* const valuePtr) :
        SdlValueType("real", std::move(valueName), valuePtr)
    {}
 
    inline std::string valueAsString(const FloatType& value) const override
    {
        return std::to_string(value);
    }
 
    inline SdlNativeData ownedNativeData(Owner& owner) const override
    {
        FloatType* const realPtr = this->getValue(owner);
        if constexpr(std::is_base_of_v<TSdlOptionalValue<FloatType, Owner>, SdlValueType>)
        {
            auto data = SdlNativeData(
                [&optReal = this->valueRef(owner)](std::size_t /* elementIdx */) -> SdlGetterVariant
                {
                    return optReal
                        ? SdlNativeData::permissiveElementGetter(&(*optReal))
                        : std::monostate{};
                },
                [&optReal = this->valueRef(owner)](std::size_t /* elementIdx */, SdlSetterVariant input) -> bool
                {
                    if(input.isEmpty())
                    {
                        optReal = std::nullopt;
                        return true;
                    }
                    else
                    {
                        optReal = FloatType{};
                        return SdlNativeData::permissiveElementSetter(input, &(*optReal));
                    }
                },
                AnyNonConstPtr(realPtr));
 
            data.numElements = realPtr ? 1 : 0;
            data.elementContainer = ESdlDataFormat::Single;
            data.elementType = sdl::float_type_of<FloatType>();
            data.isNullClearable = true;
            return data;
        }
        else
        {
            return SdlNativeData::fromSingleElement(
                realPtr, ESdlDataFormat::Single, sdl::float_type_of<FloatType>(), true, true);
        }
    }
 
protected:
    inline void loadFromSdl(
        Owner&                 owner,
        const SdlInputClause&  clause,
        const SdlInputContext& ctx) const override
    {
        this->setValue(owner, sdl::load_float<FloatType>(clause.value));
    }
 
    inline void saveToSdl(
        const Owner&            owner,
        SdlOutputClause&        out_clause,
        const SdlOutputContext& ctx) const override
    {
        if(const FloatType* value = this->getConstValue(owner); value)
        {
            sdl::save_float(*value, out_clause.value);
        }
        else
        {
            out_clause.isEmpty = true;
        }
    }
};
 
template<typename Owner, typename FloatType = real>
using TSdlOptionalReal = TSdlReal<Owner, FloatType, TSdlOptionalValue<FloatType, Owner>>;
 
template<typename Owner>
using TSdlFloat = TSdlReal<Owner, float>;
 
template<typename Owner>
using TSdlDouble = TSdlReal<Owner, double>;
 
template<typename Owner>
using TSdlFloat32 = TSdlReal<Owner, float32>;
 
template<typename Owner>
using TSdlFloat64 = TSdlReal<Owner, float64>;
 
template<typename Owner>
using TSdlOptionalFloat = TSdlOptionalReal<Owner, float>;
 
template<typename Owner>
using TSdlOptionalDouble = TSdlOptionalReal<Owner, double>;
 
template<typename Owner>
using TSdlOptionalFloat32 = TSdlOptionalReal<Owner, float32>;
 
template<typename Owner>
using TSdlOptionalFloat64 = TSdlOptionalReal<Owner, float64>;
 
}// end namespace ph