Struct RowVisitor 

pub struct RowVisitor<T, F: FnMut(T)> { /* private fields */ }

Visitor for processing PLY rows one at a time.

Provides a callback-based interface for processing PLY elements without collecting them into intermediate collections. Useful for streaming processing or when memory usage is a concern.

Example

use serde::{Deserialize, de::DeserializeSeed};
use serde_ply::{PlyChunkedReader, RowVisitor};

#[derive(Deserialize)]
struct Vertex { x: f32, y: f32, z: f32 }

let mut file = PlyChunkedReader::new();
file.buffer_mut().extend_from_slice(
    b"ply\nformat ascii 1.0\nelement vertex 1\nproperty float x\nproperty float y\nproperty float z\nend_header\n1.0 2.0 3.0\n"
);

let mut count = 0;
RowVisitor::new(|_vertex: Vertex| {
    count += 1;
}).deserialize(&mut file)?;
assert_eq!(count, 1);

Implementations

impl<T, F: FnMut(T)> RowVisitor<T, F>

pub fn new(row_callback: F) -> Self

Create a new row visitor with the given callback.

The callback is invoked for each successfully parsed row. Call serde::de::DeserializeSeed::deserialize to start processing.

Trait Implementations

impl<'de, T: Deserialize<'de>, F: FnMut(T)> DeserializeSeed<'de> for &mut RowVisitor<T, F>

type Value = ()

The type produced by using this seed.

fn deserialize<D: Deserializer<'de>>( self, deserializer: D, ) -> Result<(), D::Error>

Equivalent to the more common Deserialize::deserialize method, except with some initial piece of data (the seed) passed in.

impl<'de, T: Deserialize<'de>, F: FnMut(T)> Visitor<'de> for &mut RowVisitor<T, F>

type Value = ()

The value produced by this visitor.

fn expecting(&self, formatter: &mut Formatter<'_>) -> Result

Format a message stating what data this Visitor expects to receive.

fn visit_seq<A: SeqAccess<'de>>(self, seq: A) -> Result<(), A::Error>

The input contains a sequence of elements.

fn visit_bool<E>(self, v: bool) -> Result<Self::Value, E>

where E: Error,

The input contains a boolean.

fn visit_i8<E>(self, v: i8) -> Result<Self::Value, E>

where E: Error,

The input contains an i8.

fn visit_i16<E>(self, v: i16) -> Result<Self::Value, E>

where E: Error,

The input contains an i16.

fn visit_i32<E>(self, v: i32) -> Result<Self::Value, E>

where E: Error,

The input contains an i32.

fn visit_i64<E>(self, v: i64) -> Result<Self::Value, E>

where E: Error,

The input contains an i64.

fn visit_i128<E>(self, v: i128) -> Result<Self::Value, E>

where E: Error,

The input contains a i128.

fn visit_u8<E>(self, v: u8) -> Result<Self::Value, E>

where E: Error,

The input contains a u8.

fn visit_u16<E>(self, v: u16) -> Result<Self::Value, E>

where E: Error,

The input contains a u16.

fn visit_u32<E>(self, v: u32) -> Result<Self::Value, E>

where E: Error,

The input contains a u32.

fn visit_u64<E>(self, v: u64) -> Result<Self::Value, E>

where E: Error,

The input contains a u64.

fn visit_u128<E>(self, v: u128) -> Result<Self::Value, E>

where E: Error,

The input contains a u128.

fn visit_f32<E>(self, v: f32) -> Result<Self::Value, E>

where E: Error,

The input contains an f32.

fn visit_f64<E>(self, v: f64) -> Result<Self::Value, E>

where E: Error,

The input contains an f64.

fn visit_char<E>(self, v: char) -> Result<Self::Value, E>

where E: Error,

The input contains a char.

fn visit_str<E>(self, v: &str) -> Result<Self::Value, E>

where E: Error,

The input contains a string. The lifetime of the string is ephemeral and it may be destroyed after this method returns.

fn visit_borrowed_str<E>(self, v: &'de str) -> Result<Self::Value, E>

where E: Error,

The input contains a string that lives at least as long as the Deserializer.

fn visit_string<E>(self, v: String) -> Result<Self::Value, E>

where E: Error,

The input contains a string and ownership of the string is being given to the Visitor.

fn visit_bytes<E>(self, v: &[u8]) -> Result<Self::Value, E>

where E: Error,

The input contains a byte array. The lifetime of the byte array is ephemeral and it may be destroyed after this method returns.

fn visit_borrowed_bytes<E>(self, v: &'de [u8]) -> Result<Self::Value, E>

where E: Error,

The input contains a byte array that lives at least as long as the Deserializer.

fn visit_byte_buf<E>(self, v: Vec<u8>) -> Result<Self::Value, E>

where E: Error,

The input contains a byte array and ownership of the byte array is being given to the Visitor.

fn visit_none<E>(self) -> Result<Self::Value, E>

where E: Error,

The input contains an optional that is absent.

fn visit_some<D>( self, deserializer: D, ) -> Result<Self::Value, <D as Deserializer<'de>>::Error>

where D: Deserializer<'de>,

The input contains an optional that is present.

fn visit_unit<E>(self) -> Result<Self::Value, E>

where E: Error,

The input contains a unit ().

fn visit_newtype_struct<D>( self, deserializer: D, ) -> Result<Self::Value, <D as Deserializer<'de>>::Error>

where D: Deserializer<'de>,

The input contains a newtype struct.

fn visit_map<A>( self, map: A, ) -> Result<Self::Value, <A as MapAccess<'de>>::Error>

where A: MapAccess<'de>,

The input contains a key-value map.

fn visit_enum<A>( self, data: A, ) -> Result<Self::Value, <A as EnumAccess<'de>>::Error>

where A: EnumAccess<'de>,

The input contains an enum.