mirror of https://github.com/Qiskit/qiskit.git
23 lines
894 B
YAML
23 lines
894 B
YAML
---
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features_circuits:
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- |
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The classical realtime-expressions module :mod:`qiskit.circuit.classical` can now represent
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constant expressions. The :class:`~.expr.Expr` class now has a bool
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:attr:`~.expr.Expr.const` attribute which indicates the expression's const-ness. This allows
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us to enforce that expressions in certain contexts must be possible to evaluate at compile time.
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All :class:`~.expr.Var` expressions are considered to be non-const, while all :class:`~.expr.Value`
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expressions are const.
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An expression comprised only of other const expressions is also const::
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from qiskit.circuit.classical import expr
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assert expr.bit_and(5, 6).const
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An expression that contains any non-const expression is non-const::
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from qiskit.circuit.classical import expr, types
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assert not expr.bit_and(5, expr.Var.new("a", types.Uint(5)).const
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