token group: init interface

Cargo.toml

@@ -41,6 +41,7 @@ members = [
   "stake-pool/cli",
   "stake-pool/program",
   "stateless-asks/program",
+  "token-group/interface",
   "token-lending/cli",
   "token-lending/program",
   "token-metadata/example",

token-group/interface/Cargo.toml

@@ -0,0 +1,24 @@
+[package]
+name = "spl-token-group-interface"
+version = "0.1.0"
+description = "Solana Program Library Token Group Interface"
+authors = ["Solana Labs Maintainers <[email protected]>"]
+repository = "https://github.com/solana-labs/solana-program-library"
+license = "Apache-2.0"
+edition = "2021"
+
+[dependencies]
+bytemuck = "1.14.0"
+solana-program = "1.16.3"
+spl-discriminator = { version = "0.1.0" , path = "../../libraries/discriminator" }
+spl-pod = { version = "0.1.0" , path = "../../libraries/pod", features = ["borsh"] }
+spl-program-error = { version = "0.3.0" , path = "../../libraries/program-error" }
+
+[dev-dependencies]
+spl-type-length-value = { version = "0.3.0", path = "../../libraries/type-length-value", features = ["derive"] }
+
+[lib]
+crate-type = ["cdylib", "lib"]
+
+[package.metadata.docs.rs]
+targets = ["x86_64-unknown-linux-gnu"]

token-group/interface/src/error.rs

@@ -0,0 +1,14 @@
+//! Interface error types
+
+use spl_program_error::*;
+
+/// Errors that may be returned by the interface.
+#[spl_program_error]
+pub enum TokenGroupError {
+    /// Size is greater than proposed max size
+    #[error("Size is greater than proposed max size")]
+    SizeExceedsNewMaxSize,
+    /// Size is greater than max size
+    #[error("Size is greater than max size")]
+    SizeExceedsMaxSize,
+}