Promote CONTROL_FLOW_OP_NAMES to public API

qiskit/circuit/__init__.py

@@ -686,6 +686,13 @@
 
     ControlFlowOp
 
+For convenience, there is a :class:`frozenset` instance containing the :attr:`.Instruction.name`
+attributes of each of the control-flow operations.
+
+.. data:: CONTROL_FLOW_OP_NAMES
+
+    Set of the instruction names of Qiskit's known control-flow operations.
+
 These control-flow operations (:class:`IfElseOp`, :class:`WhileLoopOp`,
 :class:`SwitchCaseOp` and :class:`ForLoopOp`) all have specific state that defines the branching
 conditions and strategies, but contain all the different subcircuit blocks that might be entered in
@@ -1257,6 +1264,7 @@ def __array__(self, dtype=None, copy=None):
     CASE_DEFAULT,
     BreakLoopOp,
     ContinueLoopOp,
+    CONTROL_FLOW_OP_NAMES,
 )
 
 from .annotated_operation import AnnotatedOperation, InverseModifier, ControlModifier, PowerModifier

qiskit/circuit/controlflow/__init__.py

@@ -25,3 +25,4 @@
 
 
 CONTROL_FLOW_OP_NAMES = frozenset(("for_loop", "while_loop", "if_else", "switch_case"))
+"""Set of the instruction names of Qiskit's known control-flow operations."""

releasenotes/notes/control-flow-op-names-c66f38f8a0e15ce7.yaml

@@ -0,0 +1,5 @@
+---
+features_circuits:
+  - |
+    A new data attribute, :data:`qiskit.circuit.CONTROL_FLOW_OP_NAMES`, is available to easily find
+    and check whether a given :class:`~.circuit.Instruction` is a control-flow operation by name.