anchor

Counter (Anchor)

Note

This is the Anchor v2 copy of this example. Every anchor command on this page needs the v2 CLI: cargo install anchor-cli --version 2.0.0-rc.1 --locked (avm has no prebuilt binary for this pre-release). The Anchor v1 version of this example is in ../anchor-v1.

Increment a global counter stored in a PDA. Anchor adds an explicit initialize_counter handler that the native variant handles differently.

See also: the repository catalog.

Major concepts

• PDA seeds for global state
• init vs mut account constraints
• Instruction handlers: initialize and increment

Setup

From basics/counter/anchor/:

anchor build

Testing

anchor test

LiteSVM integration tests in programs/counter_anchor/tests/ call handlers and assert the stored count.

Usage

Inspect programs/counter_anchor/src/ for seeds and handler definitions.