Struct RuntimePolicy 

pub struct RuntimePolicy { /* private fields */ }

Runtime choices used to create one immutable operation context.

The default policy is deterministic. System state is consulted only after callers explicitly select a system adapter, either individually or through RuntimePolicy::try_native.

Implementations

impl RuntimePolicy

pub const NATIVE_SYSTEM_ADAPTER_IDS: &'static [&'static str]

System adapters selected by Self::try_native.

This list is a policy contract, not a report of what Cargo compiled. Consumers that advertise a native policy should intersect it with compiled_system_adapter_ids.

pub fn deterministic() -> Self

Returns the deterministic, target-independent core policy.

pub fn try_native() -> Result<Self, RuntimePolicyError>

Selects the native clock, complete local-time rules, and random source.

Timing instrumentation remains opt-in through RuntimePolicy::try_with_system_timing because enabling it changes observable diagnostics and adds work to every operation.

pub fn from_operation_context(context: OperationContext) -> Self

Replays an already captured operation without consulting system state again.

pub fn with_fixed_unix_millis(self, unix_millis: i64) -> Self

pub fn try_with_system_clock(self) -> Result<Self, RuntimePolicyError>

pub fn with_fixed_today(self, today: Option<CivilDate>) -> Self

pub fn try_with_fixed_today_at_local_midnight( self, today: CivilDate, ) -> Result<Self, RuntimePolicyError>

Freezes both the local calendar day and the operation clock at that day’s local midnight.

Use this when a host accepts a date-only configuration value such as fixed_today. Resolving it through the selected time zone preserves target-date DST behavior and returns a typed error when the date cannot be represented instead of overflowing at an offset boundary.

pub fn try_with_fixed_local_offset_minutes( self, offset_minutes: i32, ) -> Result<Self, RuntimePolicyError>

Selects a fixed UTC offset without overloading a sentinel value to mean “system”.

pub fn with_local_time_zone(self, time_zone: LocalTimeZone) -> Self

pub fn try_with_system_time_zone(self) -> Result<Self, RuntimePolicyError>

pub fn with_fixed_seed(self, seed: u64) -> Self

pub fn try_with_system_random(self) -> Result<Self, RuntimePolicyError>

pub fn try_with_system_timing(self) -> Result<Self, RuntimePolicyError>

Enables the compiled system timing adapter.

pub fn fixed_local_offset_minutes(&self) -> Option<i32>

pub fn fixed_today(&self) -> Option<CivilDate>

pub fn local_time_zone(&self) -> &LocalTimeZone

pub fn begin_operation(&self) -> Result<OperationContext, RuntimePolicyError>

Freezes all selected adapters for one parse or render operation.

Trait Implementations

impl Clone for RuntimePolicy

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for RuntimePolicy

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

Formats the value using the given formatter.

impl Default for RuntimePolicy

fn default() -> Self

Returns the “default value” for a type.

impl Eq for RuntimePolicy

impl PartialEq for RuntimePolicy

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for RuntimePolicy