spl_token_2022/extension/
mint_close_authority.rs

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#[cfg(feature = "serde-traits")]
use serde::{Deserialize, Serialize};
use {
    crate::extension::{Extension, ExtensionType},
    bytemuck::{Pod, Zeroable},
    spl_pod::optional_keys::OptionalNonZeroPubkey,
};

/// Close authority extension data for mints.
#[repr(C)]
#[cfg_attr(feature = "serde-traits", derive(Serialize, Deserialize))]
#[cfg_attr(feature = "serde-traits", serde(rename_all = "camelCase"))]
#[derive(Clone, Copy, Debug, Default, PartialEq, Pod, Zeroable)]
pub struct MintCloseAuthority {
    /// Optional authority to close the mint
    pub close_authority: OptionalNonZeroPubkey,
}
impl Extension for MintCloseAuthority {
    const TYPE: ExtensionType = ExtensionType::MintCloseAuthority;
}