Struct Memo 

pub struct Memo<'a, 'b, 'c> {
    pub signers: &'a [&'a AccountView],
    pub memo: &'b [u8],
    pub program_id: Option<&'c Address>,
}

SPL Memo CPI builder.

signers are the accounts the memo program will assert signed the surrounding transaction; pass an empty slice for unauthenticated memos (the program then only logs the bytes). memo is the raw payload - UTF-8 framing is the caller’s responsibility.

program_id selects the target program. Default (None) uses MEMO_PROGRAM_ID (Memo v2). Pass Some(&v1::MEMO_V1_PROGRAM_ID) for the legacy program.

The struct holds borrowed references only; nothing is allocated on the heap.

Fields

signers: &'a [&'a AccountView]

Signing accounts the Memo program will validate.

memo: &'b [u8]

Raw memo payload.

program_id: Option<&'c Address>

Target program. None = Memo v2 (default).

Implementations

impl Memo<'_, '_, '_>

pub fn invoke(&self) -> Result<(), ProgramError>

Invoke the Memo program with no PDA signer seeds.

pub fn invoke_signed( &self, signers_seeds: &[Signer<'_, '_>], ) -> Result<(), ProgramError>

Invoke the Memo program, supplying PDA signer seeds.

Any signer in self.signers whose address is a PDA must have its derivation seeds in signers_seeds; the runtime will sign the inner CPI on its behalf.