Struct TransitionRulePack 

pub struct TransitionRulePack<const N: usize> { /* private fields */ }

Associates validation rules with specific instruction tags.

Each instruction in your program can have its own set of checks, looked up by the dispatch tag. This avoids running irrelevant checks for instructions that don’t need them.

let mut tr = TransitionRulePack::<16>::new();
tr.add(0, validate_init_accounts)?;   // Init
tr.add(1, validate_deposit_accounts)?; // Deposit
tr.add(2, validate_withdraw_accounts)?; // Withdraw

// In handler: run only rules for this instruction
tr.run_for(instruction_tag, &ctx)?;

Implementations

impl<const N: usize> TransitionRulePack<N>

pub const fn new() -> Self

Create an empty rule pack.

pub fn add( &mut self, tag: InstructionTag, rule: ValidateFn, ) -> Result<(), ProgramError>

Register a rule for a specific instruction tag.

pub fn run_for( &self, tag: InstructionTag, ctx: &ValidationContext<'_>, ) -> ProgramResult

Run all rules matching the given instruction tag. Fail-fast.

pub fn len(&self) -> usize

Number of entries.

pub fn is_empty(&self) -> bool

Whether the rule pack has no entries.

Trait Implementations

impl<const N: usize> Default for TransitionRulePack<N>

fn default() -> Self

Returns the “default value” for a type.