Python multiple inheritance or decorators for composable behaviours
I recently discovered (or rather realised how to use) Python’s multiple inheritance, and am afraid I’m now using it in cases where it’s not a good fit. I want to have some starting data source (NewsCacheDB,TwitterStream) that gets transformed in various ways (Vectorize,SelectKBest,SelectPercentile).
Does a Mixin By Definition Allow Storing Data in Mixin-Level Instance Variables?
Several implementations of mixins (e.g. Ruby mixin, Scala trait) include support for storing data (e.g. variables, properties) between method calls in instance variables. There was a bit of debate in this question about whether or not a Java virtual extension method qualified as a mixin because they cannot store data in this way; all variables are inputted and outputted within the scope of the method call and cannot be stored in an instance variable. Essentially, there was debate about what a “mixin” by definition is and whether or not implementations in Ruby and whatnot go beyond the commonly recognized definition of the programming concept.
Does a Mixin By Definition Allow Storing Data in Mixin-Level Instance Variables?
Several implementations of mixins (e.g. Ruby mixin, Scala trait) include support for storing data (e.g. variables, properties) between method calls in instance variables. There was a bit of debate in this question about whether or not a Java virtual extension method qualified as a mixin because they cannot store data in this way; all variables are inputted and outputted within the scope of the method call and cannot be stored in an instance variable. Essentially, there was debate about what a “mixin” by definition is and whether or not implementations in Ruby and whatnot go beyond the commonly recognized definition of the programming concept.
Does a Mixin By Definition Allow Storing Data in Mixin-Level Instance Variables?
Several implementations of mixins (e.g. Ruby mixin, Scala trait) include support for storing data (e.g. variables, properties) between method calls in instance variables. There was a bit of debate in this question about whether or not a Java virtual extension method qualified as a mixin because they cannot store data in this way; all variables are inputted and outputted within the scope of the method call and cannot be stored in an instance variable. Essentially, there was debate about what a “mixin” by definition is and whether or not implementations in Ruby and whatnot go beyond the commonly recognized definition of the programming concept.
How are mixins or traits better than plain multiple inheritance?
C++ has plain multiple inheritance, many language designs forbid it as dangerous. But some languages like Ruby and PHP use strange syntax to do the same thing and call it mixins or traits. I heard many times that mixins/traits are harder to abuse than plain multiple inheritance.
How are mixins or traits better than plain multiple inheritance?
C++ has plain multiple inheritance, many language designs forbid it as dangerous. But some languages like Ruby and PHP use strange syntax to do the same thing and call it mixins or traits. I heard many times that mixins/traits are harder to abuse than plain multiple inheritance.