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# Coding style
## Use these tools to find and fix issues.
- Use `clang-format` to format the code.
- Use `clang-tidy` to check the code for other potential issues.
## Follow these guidelines while writing code.
- **Indentation** : 2 spaces, no tabulation
- **Opening brace** at the end of the line
- **Naming** : Choose self-describing variable name
- **class** : PascalCase
- **namespace** : PascalCase
- **variable** : camelCase, **no** prefix/suffix (`_`, `m_`,...) for class members
- **Include guard** : `#pragma once` (no `#ifdef __MODULE__ / #define __MODULE__ / #endif`)
- **Includes** :
- files from the project : `#include "relative/path/to/the/file.h"`
- external files and std : `#include <file.h>`
- use includes relative to included directories like `src`, not relative to the current file. Don't do: `#include "../file.h"`
- Only use [primary spellings for operators and tokens](https://en.cppreference.com/w/cpp/language/operator_alternative)
- Use `auto` sparingly. Don't use `auto` for [fundamental/built-in types](https://en.cppreference.com/w/cpp/language/types) and [fixed width integer types](https://en.cppreference.com/w/cpp/types/integer), except when initializing with a cast to avoid duplicating the type name.
```c++
// Examples:
auto* app = static_cast<DisplayApp*>(instance);
auto number = static_cast<uint8_t>(variable);
uint8_t returnValue = MyFunction();
```
- Use `nullptr` instead of `NULL`
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