hugr_core/builder/
dataflow.rs

1use itertools::Itertools;
2
3use super::build_traits::{HugrBuilder, SubContainer};
4use super::handle::BuildHandle;
5use super::{BuildError, Container, Dataflow, DfgID, FuncID};
6
7use std::marker::PhantomData;
8
9use crate::hugr::internal::HugrMutInternals;
10use crate::hugr::{HugrView, ValidationError};
11use crate::ops::{self, OpParent};
12use crate::ops::{DataflowParent, Input, Output};
13use crate::{Direction, IncomingPort, OutgoingPort, Wire};
14
15use crate::types::{PolyFuncType, Signature, Type};
16
17use crate::Node;
18use crate::{Hugr, hugr::HugrMut};
19
20/// Builder for a [`ops::DFG`] node.
21#[derive(Debug, Clone, PartialEq)]
22pub struct DFGBuilder<T> {
23    pub(crate) base: T,
24    pub(crate) dfg_node: Node,
25    pub(crate) num_in_wires: usize,
26    pub(crate) num_out_wires: usize,
27}
28
29impl<T: AsMut<Hugr> + AsRef<Hugr>> DFGBuilder<T> {
30    /// Returns a new `DFGBuilder` with the given base and parent node.
31    ///
32    /// Sets up the input and output nodes of the region. If `parent` already has
33    /// input and output nodes, use [`DFGBuilder::create`] instead.
34    pub(super) fn create_with_io(
35        mut base: T,
36        parent: Node,
37        signature: Signature,
38    ) -> Result<Self, BuildError> {
39        debug_assert_eq!(base.as_ref().children(parent).count(), 0);
40
41        let num_in_wires = signature.input_count();
42        let num_out_wires = signature.output_count();
43        let input = ops::Input {
44            types: signature.input().clone(),
45        };
46        let output = ops::Output {
47            types: signature.output().clone(),
48        };
49        base.as_mut().add_node_with_parent(parent, input);
50        base.as_mut().add_node_with_parent(parent, output);
51
52        Ok(Self {
53            base,
54            dfg_node: parent,
55            num_in_wires,
56            num_out_wires,
57        })
58    }
59
60    /// Returns a new `DFGBuilder` with the given base and parent node.
61    ///
62    /// The parent node may be any `DataflowParent` node.
63    ///
64    /// If `parent` doesn't have input and output nodes, use
65    /// [`DFGBuilder::create_with_io`] instead.
66    pub(super) fn create(base: T, parent: Node) -> Result<Self, BuildError> {
67        let sig = base
68            .as_ref()
69            .get_optype(parent)
70            .inner_function_type()
71            .expect("DFG parent must have an inner function signature.");
72        let num_in_wires = sig.input_count();
73        let num_out_wires = sig.output_count();
74
75        Ok(Self {
76            base,
77            dfg_node: parent,
78            num_in_wires,
79            num_out_wires,
80        })
81    }
82}
83
84impl DFGBuilder<Hugr> {
85    /// Begin building a new DFG-rooted HUGR given its inputs, outputs,
86    /// and extension delta.
87    ///
88    /// # Errors
89    ///
90    /// Error in adding DFG child nodes.
91    pub fn new(signature: Signature) -> Result<DFGBuilder<Hugr>, BuildError> {
92        let dfg_op = ops::DFG {
93            signature: signature.clone(),
94        };
95        let base = Hugr::new_with_entrypoint(dfg_op).expect("DFG entrypoint should be valid");
96        let root = base.entrypoint();
97        DFGBuilder::create_with_io(base, root, signature)
98    }
99}
100
101impl HugrBuilder for DFGBuilder<Hugr> {
102    fn finish_hugr(self) -> Result<Hugr, ValidationError<Node>> {
103        self.base.validate()?;
104        Ok(self.base)
105    }
106}
107
108impl<T: AsMut<Hugr> + AsRef<Hugr>> Container for DFGBuilder<T> {
109    #[inline]
110    fn container_node(&self) -> Node {
111        self.dfg_node
112    }
113
114    #[inline]
115    fn hugr_mut(&mut self) -> &mut Hugr {
116        self.base.as_mut()
117    }
118
119    #[inline]
120    fn hugr(&self) -> &Hugr {
121        self.base.as_ref()
122    }
123}
124
125impl<T: AsMut<Hugr> + AsRef<Hugr>> SubContainer for DFGBuilder<T> {
126    type ContainerHandle = BuildHandle<DfgID>;
127    #[inline]
128    fn finish_sub_container(self) -> Result<Self::ContainerHandle, BuildError> {
129        Ok((self.dfg_node, self.num_out_wires).into())
130    }
131}
132
133impl<T: AsMut<Hugr> + AsRef<Hugr>> Dataflow for DFGBuilder<T> {
134    #[inline]
135    fn num_inputs(&self) -> usize {
136        self.num_in_wires
137    }
138}
139
140/// Wrapper around [`DFGBuilder`] used to build other dataflow regions.
141// Stores option of DFGBuilder so it can be taken out without moving.
142#[derive(Debug, Clone, PartialEq)]
143pub struct DFGWrapper<B, T>(DFGBuilder<B>, PhantomData<T>);
144
145impl<B, T> DFGWrapper<B, T> {
146    pub(super) fn from_dfg_builder(db: DFGBuilder<B>) -> Self {
147        Self(db, PhantomData)
148    }
149}
150
151/// Builder for a [`ops::FuncDefn`] node
152pub type FunctionBuilder<B> = DFGWrapper<B, BuildHandle<FuncID<true>>>;
153
154impl FunctionBuilder<Hugr> {
155    /// Initialize a builder for a `FuncDefn` rooted HUGR
156    /// # Errors
157    ///
158    /// Error in adding DFG child nodes.
159    pub fn new(
160        name: impl Into<String>,
161        signature: impl Into<PolyFuncType>,
162    ) -> Result<Self, BuildError> {
163        let signature: PolyFuncType = signature.into();
164        let body = signature.body().clone();
165        let op = ops::FuncDefn::new(name, signature);
166
167        let base = Hugr::new_with_entrypoint(op).expect("FuncDefn entrypoint should be valid");
168        let root = base.entrypoint();
169
170        let db = DFGBuilder::create_with_io(base, root, body)?;
171        Ok(Self::from_dfg_builder(db))
172    }
173
174    /// Add a new input to the function being constructed.
175    ///
176    /// Returns the new wire from the input node.
177    pub fn add_input(&mut self, input_type: Type) -> Wire {
178        let [inp_node, _] = self.io();
179
180        // Update the parent's root type
181        let new_optype = self.update_fn_signature(|mut s| {
182            s.input.to_mut().push(input_type);
183            s
184        });
185
186        // Update the inner input node
187        let types = new_optype.signature().body().input.clone();
188        self.hugr_mut().replace_op(inp_node, Input { types });
189        let mut new_port = self.hugr_mut().add_ports(inp_node, Direction::Outgoing, 1);
190        let new_port = new_port.next().unwrap();
191
192        // The last port in an input/output node is an order edge port, so we must shift any connections to it.
193        let new_value_port: OutgoingPort = (new_port - 1).into();
194        let new_order_port: OutgoingPort = new_port.into();
195        let order_edge_targets = self
196            .hugr()
197            .linked_inputs(inp_node, new_value_port)
198            .collect_vec();
199        self.hugr_mut().disconnect(inp_node, new_value_port);
200        for (tgt_node, tgt_port) in order_edge_targets {
201            self.hugr_mut()
202                .connect(inp_node, new_order_port, tgt_node, tgt_port);
203        }
204
205        // Update the builder metadata
206        self.0.num_in_wires += 1;
207
208        self.input_wires().next_back().unwrap()
209    }
210
211    /// Add a new output to the function being constructed.
212    pub fn add_output(&mut self, output_type: Type) {
213        let [_, out_node] = self.io();
214
215        // Update the parent's root type
216        let new_optype = self.update_fn_signature(|mut s| {
217            s.output.to_mut().push(output_type);
218            s
219        });
220
221        // Update the inner input node
222        let types = new_optype.signature().body().output.clone();
223        self.hugr_mut().replace_op(out_node, Output { types });
224        let mut new_port = self.hugr_mut().add_ports(out_node, Direction::Incoming, 1);
225        let new_port = new_port.next().unwrap();
226
227        // The last port in an input/output node is an order edge port, so we must shift any connections to it.
228        let new_value_port: IncomingPort = (new_port - 1).into();
229        let new_order_port: IncomingPort = new_port.into();
230        let order_edge_sources = self
231            .hugr()
232            .linked_outputs(out_node, new_value_port)
233            .collect_vec();
234        self.hugr_mut().disconnect(out_node, new_value_port);
235        for (src_node, src_port) in order_edge_sources {
236            self.hugr_mut()
237                .connect(src_node, src_port, out_node, new_order_port);
238        }
239
240        // Update the builder metadata
241        self.0.num_out_wires += 1;
242    }
243
244    /// Update the function builder's parent signature.
245    ///
246    /// Internal function used in [`add_input`] and [`add_output`].
247    ///
248    /// Does not update the input and output nodes.
249    ///
250    /// Returns a reference to the new optype.
251    fn update_fn_signature(&mut self, f: impl FnOnce(Signature) -> Signature) -> &ops::FuncDefn {
252        let parent = self.container_node();
253
254        let ops::OpType::FuncDefn(fd) = self.hugr_mut().optype_mut(parent) else {
255            panic!("FunctionBuilder node must be a FuncDefn")
256        };
257        *fd.signature_mut() = f(fd.inner_signature().into_owned()).into();
258        &*fd
259    }
260}
261
262impl<B: AsMut<Hugr> + AsRef<Hugr>, T> Container for DFGWrapper<B, T> {
263    #[inline]
264    fn container_node(&self) -> Node {
265        self.0.container_node()
266    }
267
268    #[inline]
269    fn hugr_mut(&mut self) -> &mut Hugr {
270        self.0.hugr_mut()
271    }
272
273    #[inline]
274    fn hugr(&self) -> &Hugr {
275        self.0.hugr()
276    }
277}
278
279impl<B: AsMut<Hugr> + AsRef<Hugr>, T> Dataflow for DFGWrapper<B, T> {
280    #[inline]
281    fn num_inputs(&self) -> usize {
282        self.0.num_inputs()
283    }
284}
285
286impl<B: AsMut<Hugr> + AsRef<Hugr>, T: From<BuildHandle<DfgID>>> SubContainer for DFGWrapper<B, T> {
287    type ContainerHandle = T;
288
289    #[inline]
290    fn finish_sub_container(self) -> Result<Self::ContainerHandle, BuildError> {
291        self.0.finish_sub_container().map(Into::into)
292    }
293}
294
295impl<T> HugrBuilder for DFGWrapper<Hugr, T> {
296    fn finish_hugr(self) -> Result<Hugr, ValidationError<Node>> {
297        self.0.finish_hugr()
298    }
299}
300
301#[cfg(test)]
302pub(crate) mod test {
303    use cool_asserts::assert_matches;
304    use ops::OpParent;
305    use rstest::rstest;
306    use serde_json::json;
307
308    use crate::builder::build_traits::DataflowHugr;
309    use crate::builder::{
310        BuilderWiringError, DataflowSubContainer, ModuleBuilder, endo_sig, inout_sig,
311    };
312    use crate::extension::SignatureError;
313    use crate::extension::prelude::Noop;
314    use crate::extension::prelude::{bool_t, qb_t, usize_t};
315    use crate::hugr::validate::InterGraphEdgeError;
316    use crate::ops::{OpTag, handle::NodeHandle};
317    use crate::ops::{OpTrait, Value};
318
319    use crate::std_extensions::logic::test::and_op;
320    use crate::types::type_param::TypeParam;
321    use crate::types::{EdgeKind, FuncValueType, RowVariable, Signature, Type, TypeBound, TypeRV};
322    use crate::utils::test_quantum_extension::h_gate;
323    use crate::{Wire, builder::test::n_identity, type_row};
324
325    use super::super::test::simple_dfg_hugr;
326    use super::*;
327    #[test]
328    fn nested_identity() -> Result<(), BuildError> {
329        let build_result = {
330            let mut outer_builder = DFGBuilder::new(endo_sig(vec![usize_t(), qb_t()]))?;
331
332            let [int, qb] = outer_builder.input_wires_arr();
333
334            let q_out = outer_builder.add_dataflow_op(h_gate(), vec![qb])?;
335
336            let inner_builder = outer_builder.dfg_builder_endo([(usize_t(), int)])?;
337            let inner_id = n_identity(inner_builder)?;
338
339            outer_builder.finish_hugr_with_outputs(inner_id.outputs().chain(q_out.outputs()))
340        };
341
342        assert_eq!(build_result.err(), None);
343
344        Ok(())
345    }
346
347    // Scaffolding for copy insertion tests
348    fn copy_scaffold<F>(f: F, msg: &'static str) -> Result<(), BuildError>
349    where
350        F: FnOnce(&mut DFGBuilder<Hugr>) -> Result<(), BuildError>,
351    {
352        let build_result = {
353            let mut builder = DFGBuilder::new(inout_sig(bool_t(), vec![bool_t(), bool_t()]))?;
354
355            f(&mut builder)?;
356
357            builder.finish_hugr()
358        };
359        assert_matches!(build_result, Ok(_), "Failed on example: {}", msg);
360
361        Ok(())
362    }
363    #[test]
364    fn copy_insertion() -> Result<(), BuildError> {
365        copy_scaffold(
366            |f_build| {
367                let [b1] = f_build.input_wires_arr();
368                f_build.set_outputs([b1, b1])
369            },
370            "Copy input and output",
371        )?;
372
373        copy_scaffold(
374            |f_build| {
375                let [b1] = f_build.input_wires_arr();
376                let xor = f_build.add_dataflow_op(and_op(), [b1, b1])?;
377                f_build.set_outputs([xor.out_wire(0), b1])
378            },
379            "Copy input and use with binary function",
380        )?;
381
382        copy_scaffold(
383            |f_build| {
384                let [b1] = f_build.input_wires_arr();
385                let xor1 = f_build.add_dataflow_op(and_op(), [b1, b1])?;
386                let xor2 = f_build.add_dataflow_op(and_op(), [b1, xor1.out_wire(0)])?;
387                f_build.set_outputs([xor2.out_wire(0), b1])
388            },
389            "Copy multiple times",
390        )?;
391
392        Ok(())
393    }
394
395    #[test]
396    fn copy_insertion_qubit() {
397        let builder = || {
398            let mut module_builder = ModuleBuilder::new();
399
400            let f_build = module_builder
401                .define_function("main", Signature::new(vec![qb_t()], vec![qb_t(), qb_t()]))?;
402
403            let [q1] = f_build.input_wires_arr();
404            f_build.finish_with_outputs([q1, q1])?;
405
406            Ok(module_builder.finish_hugr()?)
407        };
408
409        assert_matches!(
410            builder(),
411            Err(BuildError::OutputWiring {
412                error: BuilderWiringError::NoCopyLinear { typ, .. },
413                ..
414            })
415            if typ == qb_t()
416        );
417    }
418
419    #[test]
420    fn simple_inter_graph_edge() {
421        let builder = || -> Result<Hugr, BuildError> {
422            let mut f_build =
423                FunctionBuilder::new("main", Signature::new(vec![bool_t()], vec![bool_t()]))?;
424
425            let [i1] = f_build.input_wires_arr();
426            let noop = f_build.add_dataflow_op(Noop(bool_t()), [i1])?;
427            let i1 = noop.out_wire(0);
428
429            let mut nested =
430                f_build.dfg_builder(Signature::new(type_row![], vec![bool_t()]), [])?;
431
432            let id = nested.add_dataflow_op(Noop(bool_t()), [i1])?;
433
434            let nested = nested.finish_with_outputs([id.out_wire(0)])?;
435
436            f_build.finish_hugr_with_outputs([nested.out_wire(0)])
437        };
438
439        assert_matches!(builder(), Ok(_));
440    }
441
442    #[test]
443    fn add_inputs_outputs() {
444        let builder = || -> Result<(Hugr, Node), BuildError> {
445            let mut f_build =
446                FunctionBuilder::new("main", Signature::new(vec![bool_t()], vec![bool_t()]))?;
447            let f_node = f_build.container_node();
448
449            let [i0] = f_build.input_wires_arr();
450            let noop0 = f_build.add_dataflow_op(Noop(bool_t()), [i0])?;
451
452            // Some some order edges
453            f_build.set_order(&f_build.io()[0], &noop0.node());
454            f_build.set_order(&noop0.node(), &f_build.io()[1]);
455
456            // Add a new input and output, and connect them with a noop in between
457            f_build.add_output(qb_t());
458            let i1 = f_build.add_input(qb_t());
459            let noop1 = f_build.add_dataflow_op(Noop(qb_t()), [i1])?;
460
461            let hugr = f_build.finish_hugr_with_outputs([noop0.out_wire(0), noop1.out_wire(0)])?;
462            Ok((hugr, f_node))
463        };
464
465        let (hugr, f_node) = builder().unwrap_or_else(|e| panic!("{e}"));
466
467        let func_sig = hugr.get_optype(f_node).inner_function_type().unwrap();
468        assert_eq!(
469            func_sig.io(),
470            (
471                &vec![bool_t(), qb_t()].into(),
472                &vec![bool_t(), qb_t()].into()
473            )
474        );
475    }
476
477    #[test]
478    fn error_on_linear_inter_graph_edge() -> Result<(), BuildError> {
479        let mut f_build = FunctionBuilder::new("main", Signature::new(vec![qb_t()], vec![qb_t()]))?;
480
481        let [i1] = f_build.input_wires_arr();
482        let noop = f_build.add_dataflow_op(Noop(qb_t()), [i1])?;
483        let i1 = noop.out_wire(0);
484
485        let mut nested = f_build.dfg_builder(Signature::new(type_row![], vec![qb_t()]), [])?;
486
487        let id_res = nested.add_dataflow_op(Noop(qb_t()), [i1]);
488
489        // The error would anyway be caught in validation when we finish the Hugr,
490        // but the builder catches it earlier
491        assert_matches!(
492            id_res.map(|bh| bh.handle().node()), // Transform into something that impl's Debug
493            Err(BuildError::OperationWiring {
494                error: BuilderWiringError::NonCopyableIntergraph { .. },
495                ..
496            })
497        );
498
499        Ok(())
500    }
501
502    #[rstest]
503    fn dfg_hugr(simple_dfg_hugr: Hugr) {
504        assert_eq!(simple_dfg_hugr.num_nodes(), 7);
505        assert_eq!(simple_dfg_hugr.entry_descendants().count(), 3);
506        assert_matches!(simple_dfg_hugr.entrypoint_optype().tag(), OpTag::Dfg);
507    }
508
509    #[test]
510    fn insert_hugr() -> Result<(), BuildError> {
511        // Create a simple DFG
512        let mut dfg_builder = DFGBuilder::new(Signature::new(vec![bool_t()], vec![bool_t()]))?;
513        let [i1] = dfg_builder.input_wires_arr();
514        dfg_builder.set_metadata("x", 42);
515        let dfg_hugr = dfg_builder.finish_hugr_with_outputs([i1])?;
516
517        // Create a module, and insert the DFG into it
518        let mut module_builder = ModuleBuilder::new();
519
520        let (dfg_node, f_node) = {
521            let mut f_build =
522                module_builder.define_function("main", Signature::new_endo(bool_t()))?;
523
524            let [i1] = f_build.input_wires_arr();
525            let dfg = f_build.add_hugr_with_wires(dfg_hugr, [i1])?;
526            let f = f_build.finish_with_outputs([dfg.out_wire(0)])?;
527            module_builder.set_child_metadata(f.node(), "x", "hi");
528            (dfg.node(), f.node())
529        };
530
531        let hugr = module_builder.finish_hugr()?;
532        assert_eq!(hugr.entry_descendants().count(), 7);
533
534        assert_eq!(hugr.get_metadata(hugr.entrypoint(), "x"), None);
535        assert_eq!(hugr.get_metadata(dfg_node, "x").cloned(), Some(json!(42)));
536        assert_eq!(hugr.get_metadata(f_node, "x").cloned(), Some(json!("hi")));
537
538        Ok(())
539    }
540
541    #[test]
542    fn barrier_node() -> Result<(), BuildError> {
543        let mut parent = DFGBuilder::new(endo_sig(bool_t()))?;
544
545        let [w] = parent.input_wires_arr();
546
547        let mut dfg_b = parent.dfg_builder(endo_sig(bool_t()), [w])?;
548        let [w] = dfg_b.input_wires_arr();
549
550        let barr0 = dfg_b.add_barrier([w])?;
551        let [w] = barr0.outputs_arr();
552
553        let barr1 = dfg_b.add_barrier([w])?;
554        let [w] = barr1.outputs_arr();
555
556        let dfg = dfg_b.finish_with_outputs([w])?;
557        let [w] = dfg.outputs_arr();
558
559        let mut dfg2_b = parent.dfg_builder(endo_sig(vec![bool_t(), bool_t()]), [w, w])?;
560        let [w1, w2] = dfg2_b.input_wires_arr();
561        let barr2 = dfg2_b.add_barrier([w1, w2])?;
562        let wires: Vec<Wire> = barr2.outputs().collect();
563
564        let dfg2 = dfg2_b.finish_with_outputs(wires)?;
565        let [w, _] = dfg2.outputs_arr();
566        parent.finish_hugr_with_outputs([w])?;
567
568        Ok(())
569    }
570
571    #[test]
572    fn non_cfg_ancestor() -> Result<(), BuildError> {
573        let unit_sig = Signature::new(type_row![Type::UNIT], type_row![Type::UNIT]);
574        let mut b = DFGBuilder::new(unit_sig.clone())?;
575        let b_child = b.dfg_builder(unit_sig.clone(), [b.input().out_wire(0)])?;
576        let b_child_in_wire = b_child.input().out_wire(0);
577        b_child.finish_with_outputs([])?;
578        let b_child_2 = b.dfg_builder(unit_sig.clone(), [])?;
579
580        // DFG block has edge coming a sibling block, which is only valid for
581        // CFGs
582        let b_child_2_handle = b_child_2.finish_with_outputs([b_child_in_wire])?;
583
584        let res = b.finish_hugr_with_outputs([b_child_2_handle.out_wire(0)]);
585
586        assert_matches!(
587            res,
588            Err(BuildError::InvalidHUGR(
589                ValidationError::InterGraphEdgeError(InterGraphEdgeError::NonCFGAncestor { .. })
590            ))
591        );
592        Ok(())
593    }
594
595    #[test]
596    fn no_relation_edge() -> Result<(), BuildError> {
597        let unit_sig = Signature::new(type_row![Type::UNIT], type_row![Type::UNIT]);
598        let mut b = DFGBuilder::new(unit_sig.clone())?;
599        let mut b_child = b.dfg_builder(unit_sig.clone(), [b.input().out_wire(0)])?;
600        let b_child_child = b_child.dfg_builder(unit_sig.clone(), [b_child.input().out_wire(0)])?;
601        let b_child_child_in_wire = b_child_child.input().out_wire(0);
602
603        b_child_child.finish_with_outputs([])?;
604        b_child.finish_with_outputs([])?;
605
606        let mut b_child_2 = b.dfg_builder(unit_sig.clone(), [])?;
607        let b_child_2_child =
608            b_child_2.dfg_builder(unit_sig.clone(), [b_child_2.input().out_wire(0)])?;
609
610        let res = b_child_2_child.finish_with_outputs([b_child_child_in_wire]);
611
612        assert_matches!(
613            res.map(|h| h.handle().node()), // map to something that implements Debug
614            Err(BuildError::OutputWiring {
615                error: BuilderWiringError::NoRelationIntergraph { .. },
616                ..
617            })
618        );
619        Ok(())
620    }
621
622    #[test]
623    fn no_outer_row_variables() -> Result<(), BuildError> {
624        let e = crate::hugr::validate::test::extension_with_eval_parallel();
625        let tv = TypeRV::new_row_var_use(0, TypeBound::Copyable);
626        // Can *declare* a function that takes a function-value of unknown #args
627        FunctionBuilder::new(
628            "bad_eval",
629            PolyFuncType::new(
630                [TypeParam::new_list(TypeBound::Copyable)],
631                Signature::new(
632                    Type::new_function(FuncValueType::new(usize_t(), tv.clone())),
633                    vec![],
634                ),
635            ),
636        )?;
637
638        // But cannot eval it...
639        let ev = e.instantiate_extension_op(
640            "eval",
641            [vec![usize_t().into()].into(), vec![tv.into()].into()],
642        );
643        assert_eq!(
644            ev,
645            Err(SignatureError::RowVarWhereTypeExpected {
646                var: RowVariable(0, TypeBound::Copyable)
647            })
648        );
649        Ok(())
650    }
651
652    #[test]
653    fn order_edges() {
654        let (mut hugr, load_constant, call) = {
655            let mut builder = ModuleBuilder::new();
656            let func = builder
657                .declare("func", Signature::new_endo(bool_t()).into())
658                .unwrap();
659            let (load_constant, call) = {
660                let mut builder = builder
661                    .define_function("main", Signature::new(Type::EMPTY_TYPEROW, bool_t()))
662                    .unwrap();
663                let load_constant = builder.add_load_value(Value::true_val());
664                let [r] = builder
665                    .call(&func, &[], [load_constant])
666                    .unwrap()
667                    .outputs_arr();
668                builder.finish_with_outputs([r]).unwrap();
669                (load_constant.node(), r.node())
670            };
671            (builder.finish_hugr().unwrap(), load_constant, call)
672        };
673
674        let lc_optype = hugr.get_optype(load_constant);
675        let call_optype = hugr.get_optype(call);
676        assert_eq!(EdgeKind::StateOrder, lc_optype.other_input().unwrap());
677        assert_eq!(EdgeKind::StateOrder, lc_optype.other_output().unwrap());
678        assert_eq!(EdgeKind::StateOrder, call_optype.other_input().unwrap());
679        assert_eq!(EdgeKind::StateOrder, call_optype.other_output().unwrap());
680
681        hugr.connect(
682            load_constant,
683            lc_optype.other_output_port().unwrap(),
684            call,
685            call_optype.other_input_port().unwrap(),
686        );
687
688        hugr.validate().unwrap();
689    }
690}
hugr_core/builder/dataflow.rs

hugr_core/builder/
dataflow.rs
