Struct KeyedEmitter 

pub struct KeyedEmitter<'a, B: JsonBackend> { /* private fields */ }

Single-use handle returned by JsonEmitter::key.

Consumed by KeyedEmitter::object, KeyedEmitter::array, KeyedEmitter::value, KeyedEmitter::open_object, or KeyedEmitter::open_array.

Implementations

impl<B: JsonBackend> KeyedEmitter<'_, B>

pub fn array<F>(self, f: F) -> Result<()>

where F: FnOnce(&mut JsonEmitter<B>) -> Result<()>,

Consume the key and write an array value via closure.

Best-effort scope guard: if the closure returns Err, the array close is still attempted; the closure’s error takes precedence.

Errors

Returns Err if a key is not allowed here, or if the closure or backend errors.

pub fn object<F>(self, f: F) -> Result<()>

where F: FnOnce(&mut JsonEmitter<B>) -> Result<()>,

Consume the key and write an object value via closure.

Best-effort scope guard: if the closure returns Err, the object close is still attempted; the closure’s error takes precedence.

Errors

Returns Err if a key is not allowed here, or if the closure or backend errors.

pub fn open_array(self) -> Result<()>

Consume the key and open an array. Caller must later call JsonEmitter::close_array on the underlying emitter.

Errors

Returns Err if a key is not allowed here, or if the backend errors.

pub fn open_object(self) -> Result<()>

Consume the key and open an object. Caller must later call JsonEmitter::close_object on the underlying emitter.

Errors

Returns Err if a key is not allowed here, or if the backend errors.

pub fn value<V: WriteVal>(self, v: V) -> Result<()>

Consume the key and write a scalar value.

Errors

Returns Err if a key is not allowed here, or if the backend errors.