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# kate: tab-width 2; replace-tabs off; indent-width 2;
#
# ==============================================================================
# Authors: Patrick Lehmann
#
# Auxillary Classes: Auxillary classes to implement call by reference.
#
# License:
# ==============================================================================
# Copyright 2017-2018 Patrick Lehmann - Bötzingen, Germany
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
# ==============================================================================
#
# load dependencies
__api__ = [
'CallByRefParam',
'CallByRefBoolParam',
'CallByRefIntParam'
]
__all__ = __api__
[docs]class CallByRefParam:
"""Implements a "call by reference" parameter.
.. seealso::
:py:class:`CallByRefBoolParam`
A special "call by reference" implementation for boolean reference types.
:py:class:`CallByRefIntParam`
A special "call by reference" implementation for integer reference types.
"""
def __init__(self, value=None):
self.value = value
def __ilshift__(self, other):
self.value = other
return self
def __eq__(self, other): return self.value == other
def __ne__(self, other): return self.value != other
def __repr__(self): return repr(self.value)
def __str__(self): return str(self.value)
[docs]class CallByRefBoolParam(CallByRefParam):
"""A special "call by reference" implementation for boolean reference types."""
# unary operators
def __neg__(self): return not self.value
# binary operators - logical
def __and__(self, other): return self.value and other
def __or__(self, other): return self.value or other
# binary inplace operators
def __iand__(self, other):
self.value = self.value and other
return self
def __ior__(self, other):
self.value = self.value or other
return self
# type conversion operators
def __bool__(self): return self.value
def __int__(self): return int(self.value)
[docs]class CallByRefIntParam(CallByRefParam):
"""A special "call by reference" implementation for integer reference types."""
# unary operators
def __neg__(self): return not self.value
# binary operators - arithmetic
def __add__(self, other): return self.value + other
def __sub__(self, other): return self.value - other
def __truediv__(self, other): return self.value / other
def __mul__(self, other): return self.value * other
def __mod__(self, other): return self.value % other
def __pow__(self, other): return self.value ** other
# binary operators - comparison
def __eq__(self, other): return self.value == other
def __ne__(self, other): return self.value != other
def __lt__(self, other): return self.value < other
def __le__(self, other): return self.value <= other
def __gt__(self, other): return self.value > other
def __ge__(self, other): return self.value >= other
# type conversion operators
def __bool__(self): return bool(self.value)
def __int__(self): return self.value