---
title: "Discussion on \"I Ran a Coupling Analyzer on nlohmann/json and fmt. It Found a Class Doing 55 Jobs\" | Hashnode"
description: "Discussion on \"I Ran a Coupling Analyzer on nlohmann/json and fmt. It Found a Class Doing 55 Jobs\". Measuring architecture with Ca, Ce, Instability, and LCOM4 — and the gate that keeps instability from crying wolf"
url: "https://hashnode.com/posts/cpp-coupling-metrics-nlohmann-json-fmt/6a7ff182d238f7aea14a7a75"
---

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# [I Ran a Coupling Analyzer on nlohmann/json and fmt. It Found a Class Doing 55 Jobs](https://amankarki.hashnode.dev/cpp-coupling-metrics-nlohmann-json-fmt?utm_source=hashnode&utm_medium=feed)

Measuring architecture with Ca, Ce, Instability, and LCOM4 — and the gate that keeps instability from crying wolf

Aug 15 · 7 min read · amankarki.hashnode.dev  
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## Written by

[Aman Karki](https://hashnode.com/@amankarki)

@amankarki · India

  
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C++/CUDA Engineer · LLM Inference & Systems

C++/CUDA engineer building LLM inference and GPU code from scratch: verbum.cpp, Lattice, RAAG. 2 CUDA PRs merged into llama.cpp. I write about inference, GPU performance, and measuring things honestly.

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