IDAllocator.hpp

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#ifndef ECHOMAP_IDALLOCATOR_HPP
#define ECHOMAP_IDALLOCATOR_HPP
 
#include <atomic>
#include <cassert>
#include <cstdint>
#include <limits>
 
namespace echomap
{
 
using id_type = std::uint64_t;

template<typename>
class IDAllocator
{
public:
    static constexpr id_type invalid_id = std::numeric_limits<id_type>::max();

    [[nodiscard]] static id_type allocate() noexcept
    {
        const auto allocated = next_id.fetch_add(1, std::memory_order_relaxed);
        assert(allocated != invalid_id);
        return allocated;
    }
 
private:
    inline static std::atomic<id_type> next_id = 0;
};
 
} // namespace echomap
 
#endif // ECHOMAP_IDALLOCATOR_HPP