UniqueId.h

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// SPDX-License-Identifier: LGPL-2.1-or-later
 
#ifndef TASKOLIB_UNIQUEID_H_
#define TASKOLIB_UNIQUEID_H_
 
#include <random>
#include <string>
 
#include <gul14/optional.h>
#include <gul14/string_view.h>
 
namespace task {
 
class UniqueId
{
public:
    using ValueType = std::uint64_t;
 
    UniqueId();
 
    explicit UniqueId(ValueType id);
 
    static gul14::optional<UniqueId> from_string(gul14::string_view str);
 
    friend bool operator==(UniqueId a, UniqueId b)
    {
        return a.id_ == b.id_;
    }
 
    friend bool operator!=(UniqueId a, UniqueId b)
    {
        return a.id_ != b.id_;
    }
 
    friend std::string to_string(UniqueId uid);
 
private:
    static thread_local std::mt19937_64 random_number_generator_;
 
    ValueType id_;
};
 
 
namespace literals {
 
inline ::task::UniqueId operator""_uid(unsigned long long id)
{
    return ::task::UniqueId{ id };
}
 
} // namespace literals
 
} // namespace task
 
#endif