From 30c3bba23add31914db2d180872b7496d9074292 Mon Sep 17 00:00:00 2001
From: MatteoRobbiati <robbiati.matteo@gmail.com>
Date: Mon, 10 Feb 2025 11:18:09 +0100
Subject: [PATCH] fix: change the order or the inheritance to impose the
 correct __mro__

---
 src/qibotn/backends/abstract.py    | 6 ++++++
 src/qibotn/backends/cutensornet.py | 2 +-
 src/qibotn/backends/qmatchatea.py  | 8 +++-----
 src/qibotn/backends/quimb.py       | 2 +-
 4 files changed, 11 insertions(+), 7 deletions(-)

diff --git a/src/qibotn/backends/abstract.py b/src/qibotn/backends/abstract.py
index 8747313..24e87f6 100644
--- a/src/qibotn/backends/abstract.py
+++ b/src/qibotn/backends/abstract.py
@@ -20,10 +20,16 @@ class QibotnBackend(ABC):
     def set_precision(self, precision):
         if precision != self.precision:
             super().set_precision(precision)
+        self._setup_backend_specifics()
 
     def set_device(self, device):
         self.device = device
+        self._setup_backend_specifics()
 
     def configure_tn_simulation(self, **config):
         """Configure the TN simulation that will be performed."""
         pass
+
+    def _setup_backend_specifics(self):
+        """Configure the backend specific according to the used package."""
+        pass
diff --git a/src/qibotn/backends/cutensornet.py b/src/qibotn/backends/cutensornet.py
index 83c6b46..553fc51 100644
--- a/src/qibotn/backends/cutensornet.py
+++ b/src/qibotn/backends/cutensornet.py
@@ -8,7 +8,7 @@ from qibotn.backends.abstract import QibotnBackend
 CUDA_TYPES = {}
 
 
-class CuTensorNet(NumpyBackend, QibotnBackend):  # pragma: no cover
+class CuTensorNet(QibotnBackend, NumpyBackend):  # pragma: no cover
     # CI does not test for GPU
     """Creates CuQuantum backend for QiboTN."""
 
diff --git a/src/qibotn/backends/qmatchatea.py b/src/qibotn/backends/qmatchatea.py
index 00a5124..42559fb 100644
--- a/src/qibotn/backends/qmatchatea.py
+++ b/src/qibotn/backends/qmatchatea.py
@@ -15,7 +15,7 @@ from qibotn.result import TensorNetworkResult
 
 
 @dataclass
-class QMatchaTeaBackend(NumpyBackend, QibotnBackend):
+class QMatchaTeaBackend(QibotnBackend, NumpyBackend):
 
     def __init__(self):
         super().__init__()
@@ -25,9 +25,7 @@ class QMatchaTeaBackend(NumpyBackend, QibotnBackend):
 
         # Set default configurations
         self.configure_tn_simulation()
-        # TODO: update this function whenever ``set_device`` and ``set_precision``
-        # are set (?)
-        self._setup_qmatchatea_backend()
+        self._setup_backend_specifics()
 
     def configure_tn_simulation(
         self,
@@ -52,7 +50,7 @@ class QMatchaTeaBackend(NumpyBackend, QibotnBackend):
         )
         self.ansatz = ansatz
 
-    def _setup_qmatchatea_backend(self):
+    def _setup_backend_specifics(self):
         """Configure qmatchatea QCBackend object."""
 
         qmatchatea_device = (
diff --git a/src/qibotn/backends/quimb.py b/src/qibotn/backends/quimb.py
index 951bec1..13a8cf1 100644
--- a/src/qibotn/backends/quimb.py
+++ b/src/qibotn/backends/quimb.py
@@ -5,7 +5,7 @@ from qibo.result import QuantumState
 from qibotn.backends.abstract import QibotnBackend
 
 
-class QuimbBackend(NumpyBackend, QibotnBackend):
+class QuimbBackend(QibotnBackend, NumpyBackend):
 
     def __init__(self, runcard):
         super().__init__()