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Ran 19 Oct 2023 12:06AM UTC

Files 1261

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Committed 18 Oct 2023 11:29PM UTC coverage: 86.963% (+0.03%) from 86.938%

Job # 6567751841.1

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push

github

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web-flow

Commit Message

Add singleton lookup-key logic (#11040)

* Add singleton lookup-key logic

This adds overridable logic for singleton classes to define a "key"
function, which takes the same arguments as its `__init__` and returns a
lookup key that is used as a comparison for returning singletons.  This
lets the standard singleton gates easily return the singleton instance
even when `label` is explicitly set to the default, such as happens
using the idiomatic `QuantumCircuit` methods like `x`.

This keying logic has a simple logical extension to allow more than one
singleton to exist for a single base class.  This functionality is not
yet used by the Qiskit standard library, but can easily be used to
make both closed- and open-controlled versions of gates singletons, or
to allow specific hard-coded parameters for (e.g.) `RZGate` singletons.

The decision on which gates to extend this to can be done in follow-up
commits later.

* Fix unnecessary statement

* :us:

Co-authored-by: Matthew Treinish <mtreinish@kortar.org>

* Update documentation comments

---------

Co-authored-by: Matthew Treinish <mtreinish@kortar.org>

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