mirror of https://github.com/Qiskit/qiskit-aer.git
47 lines
1.3 KiB
Python
47 lines
1.3 KiB
Python
# This code is part of Qiskit.
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#
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# (C) Copyright IBM 2018, 2021.
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#
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# This code is licensed under the Apache License, Version 2.0. You may
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# obtain a copy of this license in the LICENSE.txt file in the root directory
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# of this source tree or at http://www.apache.org/licenses/LICENSE-2.0.
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#
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# Any modifications or derivative works of this code must retain this
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# copyright notice, and modified files need to carry a notice indicating
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# that they have been altered from the originals.
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"""
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Simulator instruction to set a program counter
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"""
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from qiskit.circuit import Instruction
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from qiskit.circuit.classical.expr import Expr
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class AerJump(Instruction):
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"""
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Jump instruction
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This instruction sets a program counter to specified mark instruction.
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"""
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_directive = True
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def __init__(self, jump_to, num_qubits, num_clbits=0):
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super().__init__("jump", num_qubits, num_clbits, [jump_to])
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self.condition_expr = None
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def set_conditional(self, cond):
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"""Set condition to perform this jump instruction.
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Args:
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cond (Expr or tuple): `Expr` to call `eval_bool` or tuple for `c_if`
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Returns:
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AerJump: jump instruction added specified condition
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"""
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if isinstance(cond, Expr):
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self.condition_expr = cond
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else:
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self.c_if(*cond)
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return self
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