add conditional parameter to gate counting

pytket/binders/circuit/Circuit/main.cpp

@@ -472,15 +472,18 @@ void def_circuit(py::class_<Circuit, std::shared_ptr<Circuit>> &pyCircuit) {
           "\n\n:return: the circuit depth")
       .def(
           "n_gates_of_type",
-          [](const Circuit &circ, const OpType &_type) {
-            return circ.count_gates(_type);
+          [](const Circuit &circ, const OpType &_type,
+             const bool include_conditional) {
+            return circ.count_gates(_type, include_conditional);
           },
           "Returns the number of vertices in the dag of a given "
           "operation type.\n\n>>> c.CX(0,1)\n>>> c.H(0)\n>>> "
           "c.CX(0,1)\n>>> c.n_gates_of_type(OpType.CX)\n2\n\n:param "
-          "type: The operation type to search for\n:return: the "
-          "number of operations matching `type`",
-          py::arg("type"))
+          "type: The operation type to search for\n\n:param "
+          "include_conditional: if set to true, conditional gates will "
+          "be counted, too\n\n:return: the number of operations "
+          "matching `type`",
+          py::arg("type"), py::arg("include_conditional") = false)
       .def(
           "n_1qb_gates",
           [](const Circuit &circ) { return circ.count_n_qubit_gates(1); },

pytket/conanfile.py

@@ -38,7 +38,7 @@ def requirements(self):
         self.requires("pybind11_json/0.2.14")
         self.requires("symengine/0.12.0")
         self.requires("tkassert/0.3.4@tket/stable")
-        self.requires("tket/1.3.39@tket/stable")
+        self.requires("tket/1.3.40@tket/stable")
         self.requires("tklog/0.3.3@tket/stable")
         self.requires("tkrng/0.3.3@tket/stable")
         self.requires("tktokenswap/0.3.9@tket/stable")

pytket/docs/changelog.rst

@@ -21,6 +21,8 @@ Fixes:
 * Fix `maxwidth` parameter of `circuit_from_qasm_str`
 * Add `scratch_reg_resize_pass` to `circuit_from_qasm_str`
 * Reject incompete classical registers in pytket to qasm conversion
+* Add parameter `include_conditional` to `n_gates_of_type` to include
+  conditional gates in the count
 
 1.34.0 (October 2024)
 ---------------------

pytket/pytket/_tket/circuit.pyi

@@ -2235,7 +2235,7 @@ class Circuit:
         """
         Returns the number of vertices in the dag with two quantum edges.Ignores Input, Create, Output, Discard, Reset, Measure and Barrier vertices.
         """
-    def n_gates_of_type(self, type: OpType) -> int:
+    def n_gates_of_type(self, type: OpType, include_conditional: bool = False) -> int:
         """
         Returns the number of vertices in the dag of a given operation type.
 
@@ -2246,6 +2246,9 @@ class Circuit:
         2
 
         :param type: The operation type to search for
+
+        :param include_conditional: if set to true, conditional gates will be counted, too
+
         :return: the number of operations matching `type`
         """
     def n_nqb_gates(self, size: int) -> int:

pytket/tests/circuit_test.py

@@ -1265,6 +1265,22 @@ def test_counting_n_qubit_gates() -> None:
     assert c.n_nqb_gates(5) == 1
 
 
+def test_counting_conditional_gates() -> None:
+    c = Circuit(5, 2).X(0).H(1).Y(2).Z(3).S(4).CX(0, 1).CX(1, 2).CX(2, 3).CX(3, 4)
+    c.add_gate(OpType.H, [Qubit(0)], condition=Bit(0))
+    c.add_gate(OpType.H, [Qubit(1)], condition=(Bit(0) & Bit(1)))
+    c.add_gate(OpType.CX, [Qubit(0), Qubit(1)], condition=Bit(1))
+    assert c.n_gates_of_type(OpType.H, include_conditional=True) == 3
+    assert c.n_gates_of_type(OpType.H, include_conditional=False) == 1
+    assert c.n_gates_of_type(OpType.H) == 1
+    assert c.n_gates_of_type(OpType.X, include_conditional=True) == 1
+    assert c.n_gates_of_type(OpType.X, include_conditional=False) == 1
+    assert c.n_gates_of_type(OpType.X) == 1
+    assert c.n_gates_of_type(OpType.CX, include_conditional=True) == 5
+    assert c.n_gates_of_type(OpType.CX, include_conditional=False) == 4
+    assert c.n_gates_of_type(OpType.CX) == 4
+
+
 def test_qcontrol_box_constructors() -> None:
     # only one argument
     qcbox1 = QControlBox(Op.create(OpType.S))

tket/conanfile.py

@@ -23,7 +23,7 @@
 
 class TketConan(ConanFile):
     name = "tket"
-    version = "1.3.39"
+    version = "1.3.40"
     package_type = "library"
     license = "Apache 2"
     homepage = "https://github.com/CQCL/tket"

tket/include/tket/Circuit/Circuit.hpp

@@ -1118,7 +1118,8 @@ class Circuit {
    */
   std::map<OpType, unsigned> op_counts() const;
 
-  unsigned count_gates(const OpType &op_type) const;
+  unsigned count_gates(
+      const OpType &op_type, const bool include_conditional = false) const;
   VertexSet get_gates_of_type(const OpType &op_type) const;
 
   /**

tket/src/Circuit/macro_circ_info.cpp

@@ -51,11 +51,19 @@ std::map<OpType, unsigned> Circuit::op_counts() const {
   return counts;
 }
 
-unsigned Circuit::count_gates(const OpType& op_type) const {
+unsigned Circuit::count_gates(
+    const OpType& op_type, const bool include_conditional) const {
   unsigned counter = 0;
   BGL_FORALL_VERTICES(v, dag, DAG) {
     if (get_OpType_from_Vertex(v) == op_type) {
       ++counter;
+    } else if (
+        include_conditional &&
+        (get_OpType_from_Vertex(v) == OpType::Conditional) &&
+        (static_cast<const Conditional&>(*get_Op_ptr_from_Vertex(v))
+             .get_op()
+             ->get_type() == op_type)) {
+      ++counter;
     }
   }
   return counter;

tket/test/src/Circuit/test_Circ.cpp

@@ -176,6 +176,25 @@ SCENARIO(
   }
 }
 
+SCENARIO("test conditional count") {
+  GIVEN("conditional circ") {
+    Circuit circ;
+    register_t qreg = circ.add_q_register("qb", 2);
+    register_t creg = circ.add_c_register("b", 2);
+    circ.add_conditional_gate<UnitID>(OpType::H, {}, {qreg[1]}, {creg[0]}, 1);
+    circ.add_conditional_gate<UnitID>(OpType::H, {}, {qreg[1]}, {creg[0]}, 1);
+    circ.add_conditional_gate<UnitID>(OpType::H, {}, {qreg[1]}, {creg[0]}, 1);
+    circ.add_op<Qubit>(OpType::H, {Qubit(qreg[0])});
+    circ.add_op<Qubit>(OpType::H, {Qubit(qreg[0])});
+    REQUIRE(circ.n_qubits() == 2);
+    REQUIRE(circ.n_bits() == 2);
+    REQUIRE(circ.count_gates(OpType::CX, false) == 0);
+    REQUIRE(circ.count_gates(OpType::H, false) == 2);
+    REQUIRE(circ.count_gates(OpType::CX, true) == 0);
+    REQUIRE(circ.count_gates(OpType::H, true) == 5);
+  }
+}
+
 SCENARIO("Creating gates via Qubits and Registers") {
   GIVEN("A purely quantum circuit") {
     Circuit circ;