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#pragma once
#include <type_traits>
#include <atomic>
#include <mutex>
template <typename T, typename = void>
class Atomic;
template <typename T>
class Atomic<T, typename std::enable_if<std::is_pod<T>::value>::type>
: public std::atomic<T> {
public:
using std::atomic<T>::atomic;
using std::atomic<T>::operator=;
};
template <typename T>
class Atomic<T, typename std::enable_if<!std::is_pod<T>::value>::type> {
public:
using self_type = Atomic<T, typename std::enable_if<!std::is_pod<T>::value>::type>;
Atomic()
: data{}
, mutex{} {
}
Atomic(T data)
: data{std::move(data)}
, mutex{} {
}
Atomic(self_type const & other)
: data{}
, mutex{} {
std::lock_guard<std::mutex> lock{other.mutex};
data = other.data;
}
Atomic(self_type&& other)
: data{}
, mutex{} {
std::lock_guard<std::mutex> lock{other.mutex};
std::swap(data, other.data);
}
T operator=(T data) {
std::lock_guard<std::mutex> lock{mutex};
this->data = std::move(data);
return this->data;
}
operator T() const {
return load();
}
bool is_lock_free() const {
return false;
}
void store(T data) {
std::lock_guard<std::mutex> lock{mutex};
this->data = std::move(data);
}
T load() const {
std::lock_guard<std::mutex> lock{mutex};
return data;
}
T exchange(T data){
std::lock_guard<std::mutex> lock{mutex};
std::swap(data, this->data);
return data;
}
private:
T data;
mutable std::mutex mutex;
};
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