Struct PartStart 

pub struct PartStart {
    pub index: usize,
    pub part: Option<MessagePart>,
}

The start of a new part within the response.

Emitted once per part, before any IndexedDelta events. The part field may be None for text parts (where the type is inferred from deltas) or Some for tool-call parts where the id and name are known upfront.

Example

use loopctl::stream::PartStart;
use loopctl::message::MessagePart;
use serde_json::Value;

// Text part start — type is implicit
let text_start = PartStart { index: 0, part: None };

// Tool-call part start — id and name are provided
let tool_start = PartStart {
    index: 1,
    part: Some(MessagePart::tool_call("tool_1", "read_file", Value::Null)),
};

Fields

index: usize

Zero-based index of this part within the message.

Sequentially assigned by the API. Used to correlate IndexedDelta events with the correct part. Indices are monotonically increasing within a single stream.

part: Option<MessagePart>

The part, if known at start time.

Some for tool-call parts (so the id and name are available immediately). None for text parts, where the type is inferred from subsequent DeltaPart::Text deltas. The StreamAccumulator uses this to seed the tool ID and name before deltas arrive.

Trait Implementations

impl Clone for PartStart

fn clone(&self) -> PartStart

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for PartStart

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for PartStart

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Serialize for PartStart

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.