Macro xpc 

macro_rules! xpc {
    ($($xpc:tt)+) => { ... };
}

Construct an XPCObject from a JSON-like literal.

The xpc! macro allows you to construct XPCObject values with a syntax similar to JSON. It supports signed and unsigned integers, which is a key feature of XPC.

let value = xpc!({
    "message": "hello",
    "is_reply": true,
    "signed_value": -42,
    "unsigned_value": 42u64,
    "payload": {
        "items": [1, 2, 3],
        "metadata": null // Becomes an empty string
    }
});

Interpolation

You can interpolate variables and expressions directly into the macro. Any interpolated value must implement the XpcConvertible trait.

let user_id = 1001u64;
let is_admin = false;

let request = xpc!({
    "user_id": user_id,
    "is_admin": is_admin,
    "permissions": ["read", "write"],
});

Optional Fields and Merging

The macro supports optional fields using ? and dictionary merging using :< for cleaner construction of complex objects.

let maybe_tag: Option<&str> = Some("important");
let base_config = xpc!({ "timeout": 5000u64 });

let message = xpc!({
    "message_id": "msg-123",
    "tag":? maybe_tag,
    :< base_config,
});