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Too many class implementations can increase costs

Count the number of distinct classes involved in the scope of implemented methods. ex : MyNamespace::MyClasse1::MyMethods () {...} MyClasse2::MyMethods () {...}

Why you should care

Business Impacts

It is recommended to avoid these in order to ensure the code is more readable and cost effective.

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CAST recommendations

References

About CAST and Highlight’s Code Insights

Over the last 25 years, CAST has leveraged unique knowledge on software quality measurement by analyzing thousands of applications and billions of lines of code. Based on this experience and community standards on programming best practices, Highlight implements hundreds of code insights across 15+ technologies to calculate health factors of a software.

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For reference only. For the complete details please refer the original article
https://doc.casthighlight.com/alt_classimplementations-avoid-too-many-class-implemented-in-same-file/