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#pragma once
#include "fwd.h"
#include <util/str_stl.h>
/**
* UUID generation
*
* NOTE: It is not a real GUID (RFC 4122), as described in
* https://en.wikipedia.org/wiki/Universally_unique_identifier
* https://en.wikipedia.org/wiki/Globally_unique_identifier
*
* See https://clubs.at.yandex-team.ru/stackoverflow/10238/10240
* and https://st.yandex-team.ru/IGNIETFERRO-768 for details.
*/
struct TGUID {
ui32 dw[4] = {};
constexpr bool IsEmpty() const noexcept {
return (dw[0] | dw[1] | dw[2] | dw[3]) == 0;
}
constexpr explicit operator bool() const noexcept {
return !IsEmpty();
}
// xxxx-xxxx-xxxx-xxxx
TString AsGuidString() const;
/**
* RFC4122 GUID, which described in
* https://en.wikipedia.org/wiki/Universally_unique_identifier
* xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx
**/
TString AsUuidString() const;
static TGUID Create();
/**
* Generate time based UUID version 1 RFC4122 GUID
* https://datatracker.ietf.org/doc/html/rfc4122#section-4.1
**/
static TGUID CreateTimebased();
};
constexpr bool operator==(const TGUID& a, const TGUID& b) noexcept {
return a.dw[0] == b.dw[0] && a.dw[1] == b.dw[1] && a.dw[2] == b.dw[2] && a.dw[3] == b.dw[3];
}
constexpr bool operator!=(const TGUID& a, const TGUID& b) noexcept {
return !(a == b);
}
struct TGUIDHash {
constexpr int operator()(const TGUID& a) const noexcept {
return a.dw[0] + a.dw[1] + a.dw[2] + a.dw[3];
}
};
template <>
struct THash<TGUID> {
constexpr size_t operator()(const TGUID& g) const noexcept {
return (unsigned int)TGUIDHash()(g);
}
};
void CreateGuid(TGUID* res);
TString GetGuidAsString(const TGUID& g);
TString CreateGuidAsString();
TGUID GetGuid(TStringBuf s);
bool GetGuid(TStringBuf s, TGUID& result);
/**
* Functions for correct parsing RFC4122 GUID, which described in
* https://en.wikipedia.org/wiki/Universally_unique_identifier
**/
TGUID GetUuid(TStringBuf s);
bool GetUuid(TStringBuf s, TGUID& result);
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