Variable.h

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/*****************************************************************/
#pragma once
#include <variant>
#include <stdint.h>
#include "OTCore/CoreAPIExport.h"
#include "OTCore/TypeNames.h"
#include <limits>
#include <algorithm>
#include <math.h>
#include "ComplexNumbers.h"
 
#pragma warning(disable:4251)
namespace ot
{
 
    class OT_CORE_API_EXPORT StringWrapper
    {
    public:
        StringWrapper(const std::string& val)
        {
            _ptr = new char[val.size() + 1] {};
            val.copy(_ptr, val.size());
        }
        StringWrapper(std::string&& val)
        {
            _ptr = new char[val.size() + 1] {};
            memmove_s(_ptr, val.size(), val.c_str(), val.size());
        }
 
        StringWrapper(const StringWrapper& other)
        {
            size_t length = strlen(other._ptr) + 1;
            _ptr = new char[length] {};
            memcpy(_ptr, other._ptr, length);
        }
        StringWrapper(StringWrapper&& other) noexcept
        {
            size_t length = strlen(other._ptr) + 1;
            _ptr = new char[length];
            memmove_s(_ptr, length, other._ptr, length);
            other._ptr = nullptr;
        }
        StringWrapper& operator=(const StringWrapper& other)
        {
            if (_ptr != nullptr)
            {
                delete[] _ptr;
                _ptr = nullptr;
            }
            size_t length = strlen(other._ptr) + 1;
            _ptr = new char[length] {};
            memcpy(_ptr, other._ptr, length);
            return *this;
        }
        StringWrapper& operator=(StringWrapper&& other) noexcept
        {
            if (_ptr != nullptr)
            {
                delete[] _ptr;
                _ptr = nullptr;
            }
            size_t length = strlen(other._ptr) + 1;
            _ptr = new char[length] {};
            memmove_s(_ptr, length, other._ptr, length);
            other._ptr = nullptr;
            return *this;
        }
 
        bool operator==(const StringWrapper& other)
        {
            const int t = strcmp(_ptr, other._ptr);
            return t == 0;
        }
        bool operator<(const StringWrapper& other)
        {
            const int t = strcmp(_ptr, other._ptr);
            return t < 0;
        }
        bool operator>(const StringWrapper& other)
        {
            const int t = strcmp(_ptr, other._ptr);
            return t > 0;
        }
 
        operator const char* () const { return _ptr; }
 
        ~StringWrapper()
        {
            if (_ptr != nullptr)
            {
                delete[] _ptr;
                _ptr = nullptr;
            }
        }
    private:
        char* _ptr = nullptr;
    };
 
 
    class OT_CORE_API_EXPORT Variable
    {
    public:
        Variable() {};
        Variable(float value);
        Variable(double value);
        Variable(int32_t value);
        Variable(int64_t value);
        Variable(bool value);
        Variable(const char* value);
        Variable(const std::string& value);
        Variable(std::string&& value) noexcept;
        Variable(const complex& value);
        Variable(complex&& value) noexcept;
        Variable(const Variable& other) = default;
        Variable(Variable&& other) = default;
        Variable& operator=(const Variable& other);
        Variable& operator=(Variable&& other) noexcept;
 
        void setValue(float value);
        void setValue(double value);
        void setValue(int32_t value);
        void setValue(int64_t value);
        void setValue(bool value);
        void setValue(const char* value);
        void setValue(const std::string& value);
        void setValue(std::string&& value);
        void setValue(const complex& _value);
        void setValue(complex&& _value);
 
        bool isFloat() const;
        bool isDouble() const;
        bool isInt32() const;
        bool isInt64() const;
        bool isBool() const;
        bool isConstCharPtr() const;
        bool isComplex() const;
 
        float getFloat() const;
        double getDouble() const;
        int32_t getInt32() const;
        int64_t getInt64() const;
        bool getBool() const;
        const char* getConstCharPtr() const;
        const complex getComplex() const;
 
        bool operator==(const Variable& other)const;
        bool operator>(const Variable& other)const;
        bool operator<(const Variable& other)const;
 
        std::string getTypeName()const;
 
    private:
        using variable_t = std::variant<int32_t, int64_t, bool, float, double ,StringWrapper, complex>;
        inline bool DoubleCompare(const double& a, const double& b) const
        {
            constexpr const double epsilon = 1.0e-12; //std::numeric_limits<double>::epsilon()
            //Adaptive eps. Source: https://embeddeduse.com/2019/08/26/qt-compare-two-floats/
            if (abs(a - b) <= epsilon)
            {
                return true;
            }
            return abs(a - b) <= epsilon * (std::max)(abs(a), abs(b));
        }
        
        inline const bool FloatCompare(const float& a, const float& b) const
        {
            constexpr const float epsilon = 1.0e-6f; //std::numeric_limits<float>::epsilon()
            //Adaptive eps. Source: https://embeddeduse.com/2019/08/26/qt-compare-two-floats/
            if (abs(a - b) <= epsilon)
            {
                return true;
            }
            return abs(a - b) <= epsilon * (std::max)(abs(a), abs(b));
        }
        variable_t _value;
    };
    
}