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#pragma once
#include <mutex>
template <typename T> class Group;
template <typename T> class Accessor
{
private:
std::lock_guard<std::mutex> lock;
public:
Accessor(Group<T>& parent)
: lock{parent.mutex}
, data(parent.data)
{
}
T& data;
};
template <typename T> class Group
{
private:
friend class Accessor<T>;
mutable std::mutex mutex;
T data;
public:
Group()
: mutex{}
, data{}
{
}
Group(Group<T> const& other)
: mutex{}
, data{}
{
std::lock_guard<std::mutex> lock{other.mutex};
data = other.data;
}
Group(Group<T>&& other)
: mutex{}
, data{}
{
std::lock_guard<std::mutex> lock{other.mutex};
std::swap(data, other.data);
}
Group<T>& operator=(const Group<T>& other)
{
if (*this != &other)
{
std::lock_guard<std::mutex> lock{mutex};
std::lock_guard<std::mutex> lock2{other.mutex};
data = other.data;
}
return *this;
}
Group<T>& operator=(Group<T>&& other)
{
if (*this != &other)
{
std::lock_guard<std::mutex> lock{mutex};
std::lock_guard<std::mutex> lock2{other.mutex};
std::swap(data, other.data);
}
return *this;
}
operator T() const
{
std::lock_guard<std::mutex> lock{mutex};
return data;
}
};
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