Add claim_list

aptos-move/move-examples/claim/Move.toml

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+[package]
+name = "claim"
+version = "0.0.0"
+
+[addresses]
+claim = "_"
+
+[dependencies]
+AptosStdlib = { local = "../../framework/aptos-stdlib" }

aptos-move/move-examples/claim/sources/claim.move

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+/// Module to allow efficiently check and claim spots in a limited claim list.
+/// Developers can include this module in their application and just need to:
+/// 1. Change the package name to their own package name.
+/// 2. Add friend declarations for modules that need to depend on the claim_list module.
+/// 3. Call is_claimed and claim functions in their own code.
+module claim::claim_list {
+    use aptos_std::smart_table::{Self, SmartTable};
+
+    // Add friend declarations for modules that need to depend on claim_list.
+
+    struct ClaimList has key {
+        // Key can also be replaced with address if the claim_list is tracked by user addresses.
+        codes_claimed: SmartTable<u64, bool>,
+    }
+
+    fun init_module(claim_list_signer: &signer) {
+        move_to<ClaimList>(claim_list_signer, ClaimList {
+            codes_claimed: smart_table::new(),
+        });
+    }
+
+    public fun is_claimed(invite_code: u64): bool acquires ClaimList {
+        let codes_claimed = &borrow_global<ClaimList>(@claim).codes_claimed;
+        smart_table::contains(codes_claimed, invite_code)
+    }
+
+    public(friend) fun claim(invite_code: u64) acquires ClaimList {
+        let codes_claimed = &mut borrow_global_mut<ClaimList>(@claim).codes_claimed;
+        smart_table::add(codes_claimed, invite_code, true);
+    }
+
+    #[test_only]
+    friend claim::test_claim;
+
+    #[test_only]
+    public fun init_for_test(claim: &signer) {
+        init_module(claim);
+    }
+}

aptos-move/move-examples/claim/sources/tests/test_claim.move

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+#[test_only]
+module claim::test_claim {
+    use claim::claim_list;
+
+    #[test(claim = @0xcafe)]
+    fun test_claim(claim: &signer) {
+        claim_list::init_for_test(claim);
+        assert!(!claim_list::is_claimed(1), 0);
+        claim_list::claim(1);
+        assert!(claim_list::is_claimed(1), 1);
+    }
+}