Declared in <primitives/transaction_identifier.h>
template<
size_t _Ip,
class... _Args,
class _Tp = variant_alternative_t<_Ip, variant<transaction_identifier<false>, transaction_identifier<true>>>>
requires (_Ip < sizeof...(_Types)) && is_constructible_v<_Tp, _Args...>
[[__exclude_from_explicit_instantiation__, __abi_tag__]]
constexpr
_Tp&
emplace(_Args&&... __args);