carbon_token_program_decoder/instructions/
approve.rs

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use carbon_core::borsh;
use carbon_core::deserialize::{ArrangeAccounts, CarbonDeserialize};
use carbon_proc_macros::CarbonDeserialize;

#[derive(
    CarbonDeserialize, Debug, serde::Serialize, serde::Deserialize, PartialEq, Eq, Clone, Hash,
)]
#[carbon(discriminator = "0x04")]
pub struct Approve {
    pub amount: u64,
}

pub struct ApproveAccounts {
    pub source: solana_sdk::pubkey::Pubkey,
    pub delegate: solana_sdk::pubkey::Pubkey,
    pub owner: solana_sdk::pubkey::Pubkey,
    pub remaining_accounts: Vec<solana_sdk::instruction::AccountMeta>,
}

impl ArrangeAccounts for Approve {
    type ArrangedAccounts = ApproveAccounts;

    fn arrange_accounts(
        &self,
        accounts: Vec<solana_sdk::instruction::AccountMeta>,
    ) -> Option<Self::ArrangedAccounts> {
        let source = accounts.get(0)?;
        let delegate = accounts.get(1)?;
        let owner = accounts.get(2)?;

        Some(ApproveAccounts {
            source: source.pubkey,
            delegate: delegate.pubkey,
            owner: owner.pubkey,
            remaining_accounts: accounts.get(3..).unwrap_or_default().to_vec(),
        })
    }
}