Use frozensets for key protocols#5560
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pavoljuhas
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LGTM with fixing a few cosmetic issues.
95-martin-orion
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FrozenSet being a subclass of AbstractSet works in the case of (1) old external code calling internal magic, but may cause trouble when (2) internal code calls old external magic. Does Cirq at any point rely on the frozen-ness of these sets (e.g. for hashing)?
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LGTM modulo protocol type fixes.
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Fixes quantumlib#5557, using frozenset in key protocol dunder methods, thus allowing the top-level protocol method to avoid defensive copies. Provide a temporary warning until v0.16 for third-party dunders to do the same. This speeds up tight loops about 15% in my testing. @95-martin-orion Note this is not breaking, as FrozenSet is a subclass of AbstractSet. (AbstractSet is a readonly interface of a set, and is superclass of both FrozenSet and plain Set). Changed the return types to FrozenSet to be more explicit and make chaining easier.
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Fixes quantumlib#5557, using frozenset in key protocol dunder methods, thus allowing the top-level protocol method to avoid defensive copies. Provide a temporary warning until v0.16 for third-party dunders to do the same. This speeds up tight loops about 15% in my testing. @95-martin-orion Note this is not breaking, as FrozenSet is a subclass of AbstractSet. (AbstractSet is a readonly interface of a set, and is superclass of both FrozenSet and plain Set). Changed the return types to FrozenSet to be more explicit and make chaining easier.
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Fixes #5557, using frozenset in key protocol dunder methods, thus allowing the top-level protocol method to avoid defensive copies. Provide a temporary warning until v0.16 for third-party dunders to do the same. This speeds up tight loops about 15% in my testing. @95-martin-orion
Note this is not breaking, as FrozenSet is a subclass of AbstractSet. (AbstractSet is a readonly interface of a set, and is superclass of both FrozenSet and plain Set). Changed the return types to FrozenSet to be more explicit and make chaining easier.