v0.2.13-pre.003

crates/ksp-interface-lib/src/program_account_meta.rs

@@ -0,0 +1,52 @@
+// file: crates/ksp-interface-lib/src/program_account_meta.rs
+// version: 1
+
+/// Maximum number of account metas admitted by one passive Program instruction contract.
+pub const MAX_PROGRAM_INSTRUCTION_ACCOUNTS: usize = 255;
+
+/// Passive account metadata attached to one Program instruction.
+///
+/// Account metas preserve the caller-provided Solana account identity and the
+/// signer/writable flags without applying Program-specific semantics.
+#[derive(Clone, Copy, Debug, Eq, PartialEq)]
+pub struct ProgramAccountMeta {
+    pubkey: crate::Pubkey,
+    is_signer: bool,
+    is_writable: bool,
+}
+
+impl ProgramAccountMeta {
+    /// Creates one read-only account meta.
+    #[must_use]
+    pub const fn readonly(pubkey: crate::Pubkey, is_signer: bool) -> Self {
+        return Self { pubkey, is_signer, is_writable: false };
+    }
+
+    /// Creates one writable account meta.
+    #[must_use]
+    pub const fn writable(pubkey: crate::Pubkey, is_signer: bool) -> Self {
+        return Self { pubkey, is_signer, is_writable: true };
+    }
+
+    /// Returns whether this account must sign the containing instruction.
+    #[must_use]
+    pub const fn is_signer(&self) -> bool {
+        return self.is_signer;
+    }
+
+    /// Returns whether this account may be written by the containing instruction.
+    #[must_use]
+    pub const fn is_writable(&self) -> bool {
+        return self.is_writable;
+    }
+
+    /// Returns the canonical account address.
+    #[must_use]
+    pub const fn pubkey(&self) -> &crate::Pubkey {
+        return &self.pubkey;
+    }
+}
+
+#[cfg(test)]
+#[path = "../unit_tests/program_account_meta.rs"]
+mod tests;