Struct yottadb::TpToken

pub struct TpToken(/* private fields */);

A transaction processing token, used by yottadb to ensure ACID properties.

The only valid values for a TpToken are the default (TpToken::default()) or a token passed in from Context::tp.

TpTokens can be converted to u64, but not vice-versa.

Trait Implementations

impl Clone for TpToken

fn clone(&self) -> TpToken

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for TpToken

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for TpToken

fn default() -> Self

Returns the “default value” for a type.

impl From<TpToken> for u64

fn from(tptoken: TpToken) -> u64

This is useful for calling C functions that have not yet been wrapped in the simple_api from inside a transaction.

Example

use yottadb::*;
use yottadb::craw::ydb_buffer_t;
Context::new().tp(|ctx| {
  let tptoken_raw = u64::from(ctx.tptoken());
  let mut errstr = ydb_buffer_t {
    buf_addr: std::ptr::null_mut(),
    len_alloc: 0,
    len_used: 0,
  };
  unsafe { craw::ydb_stdout_stderr_adjust_t(tptoken_raw, &mut errstr) };
  Ok(TransactionStatus::Ok)
}, "BATCH", &[]);

impl Hash for TpToken

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl PartialEq for TpToken

fn eq(&self, other: &TpToken) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Copy for TpToken

impl Eq for TpToken

impl StructuralPartialEq for TpToken