From faf8cc885e367cf964862f2651bf22debc9e7c1f Mon Sep 17 00:00:00 2001
From: Sumner Hearth <sumnernh@gmail.com>
Date: Tue, 19 Oct 2021 23:18:32 -0400
Subject: [PATCH] Small cleanup

---
 src/builders.rs            | 4 +---
 src/feynman_state/state.rs | 1 -
 src/sparse_state/state.rs  | 3 ---
 3 files changed, 1 insertion(+), 7 deletions(-)

diff --git a/src/builders.rs b/src/builders.rs
index 979c8a5..8f6300e 100644
--- a/src/builders.rs
+++ b/src/builders.rs
@@ -1122,9 +1122,7 @@ impl<'a> UnitaryBuilder for ConditionalContextBuilder<'a> {
         let (cr, r) = self.split_absolute(r, &cindices_clone).unwrap();
         self.set_conditional_register(cr);
         let (rs, remaining) = self.split_absolute_many(r.unwrap(), &index_groups).unwrap();
-        if remaining.is_some() {
-            panic!("There should be no qubits remaining.");
-        }
+        assert!(!remaining.is_some(), "There should be no qubits remaining.");
         rs
     }
 
diff --git a/src/feynman_state/state.rs b/src/feynman_state/state.rs
index 01ba112..f5d3961 100644
--- a/src/feynman_state/state.rs
+++ b/src/feynman_state/state.rs
@@ -103,7 +103,6 @@ impl<P: Precision> FeynmanState<P> {
             let memory_depth = pops.len() / 2;
             let sub_ops = &pops[..memory_depth];
             let mut mem = FeynmanMemory::<P>::new(self.memory_size, sub_ops);
-            // TODO consider doing this recursively to cut down total runtime.
             mem.iter_mut().for_each(|(i, c)| {
                 *c = self.substate.rec_calculate_amplitude(
                     i as u64,
diff --git a/src/sparse_state/state.rs b/src/sparse_state/state.rs
index ed37f22..bff5716 100644
--- a/src/sparse_state/state.rs
+++ b/src/sparse_state/state.rs
@@ -19,7 +19,6 @@ use std::cmp::max;
 pub struct SparseQuantumState<P: Precision> {
     n: u64,
     state: Option<Vec<(u64, Complex<P>)>>,
-    multithread: bool,
 }
 
 impl<P: Precision> SparseQuantumState<P> {
@@ -55,7 +54,6 @@ impl<P: Precision> QuantumState<P> for SparseQuantumState<P> {
         Self {
             n,
             state: Some(vec![(0, Complex::one())]),
-            multithread: true,
         }
     }
 
@@ -101,7 +99,6 @@ impl<P: Precision> QuantumState<P> for SparseQuantumState<P> {
         Self {
             n,
             state: Some(cvec),
-            multithread: true,
         }
     }