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#pragma once
#include <iostream>
#include <exception>
template <typename T>
class Optional
{
T* data; //DYN MEM
void copyFrom(const Optional<T>& other);
void free();
public:
Optional();
Optional(const T& obj);
Optional(const Optional<T>& other);
Optional<T>& operator=(const Optional<T>& other);
bool containsData() const;
const T& getData() const;
void setData(const T& el);
void clear();
};
template <typename T>
Optional<T>::Optional() : data(nullptr)
{}
template <typename T>
Optional<T>::Optional(const T& obj) : data(nullptr)
{
setData(obj);
}
template <typename T>
bool Optional<T>::containsData() const
{
return data != nullptr;
}
template <typename T>
const T& Optional<T>::getData() const
{
if (!containsData())
throw std::logic_error("No data in optional");
return *data;
}
template <typename T>
void Optional<T>::setData(const T& el)
{
delete data;
data = new T(el);// copy const;
}
template <typename T>
void Optional<T>::copyFrom(const Optional<T>& other)
{
if (other.containsData())
data = new T(*other.data);
else
data = nullptr;
}
template <typename T>
void Optional<T>::free()
{
delete data;
}
template <typename T>
void Optional<T>::clear()
{
free();
data = nullptr;
}
template <typename T>
Optional<T>::Optional(const Optional<T>& other)
{
copyFrom(other);
}
template <typename T>
Optional<T>& Optional<T>::operator=(const Optional<T>& other)
{
if (this != &other)
{
free();
copyFrom(other);
}
return *this;
}
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