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use super::{
OperatorCategory, OperatorConstraints, IDENTITY_WRITE_FN, RANGE_0, RANGE_1,
};
/// > 1 input stream of type T, 1 output stream of type T
///
/// For each item passed in, pass it out without any change.
///
/// ```dfir
/// source_iter(vec!["hello", "world"])
/// -> identity()
/// -> assert_eq(["hello", "world"]);
/// ```
///
/// You can also supply a type parameter `identity::<MyType>()` to specify what items flow through the
/// the pipeline. This can be useful for helping the compiler infer types.
///
/// ```dfir
/// // Use type parameter to ensure items are `i32`s.
/// source_iter(0..10)
/// -> identity::<i32>()
/// -> assert_eq([0, 1, 2, 3, 4, 5, 6, 7, 8, 9]);
/// ```
pub const IDENTITY: OperatorConstraints = OperatorConstraints {
name: "identity",
categories: &[OperatorCategory::Map],
hard_range_inn: RANGE_1,
soft_range_inn: RANGE_1,
hard_range_out: RANGE_1,
soft_range_out: RANGE_1,
num_args: 0,
persistence_args: RANGE_0,
type_args: &(0..=1),
is_external_input: false,
has_singleton_output: false,
flo_type: None,
ports_inn: None,
ports_out: None,
input_delaytype_fn: |_| None,
write_fn: IDENTITY_WRITE_FN,
};