40 lines
2 KiB
Markdown
40 lines
2 KiB
Markdown
# Coding convention
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## Language
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The language of this project is **C++**, and all new code must be written in C++. (Modern) C++ provides a lot of useful tools and functionalities that are beneficial for embedded software development like `constexpr`, `template` and anything that provides zero-cost abstraction.
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C code is accepted if it comes from another library like FreeRTOS, NimBLE, LVGL or the NRF-SDK.
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## Coding style
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The most important rule to follow is to try to keep the code as easy to read and maintain as possible.
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Using an autoformatter is highly recommended, but make sure it's configured properly.
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There are preconfigured autoformatter rules for:
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* CLion (IntelliJ) in [.idea/codeStyles/Project.xml](/.idea/codeStyles/Project.xml)
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* `clang-format`
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Also use `clang-tidy` to check the code for other issues.
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If there are no preconfigured rules for your IDE, you can use one of the existing ones to configure your IDE.
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- **Indentation** : 2 spaces, no tabulation
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- **Opening brace** at the end of the line
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- **Naming** : Choose self-describing variable name
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- **class** : PascalCase
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- **namespace** : PascalCase
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- **variable** : camelCase, **no** prefix/suffix ('_', 'm_',...) for class members
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- **Include guard** : `#pragma once` (no `#ifdef __MODULE__ / #define __MODULE__ / #endif`)
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- **Includes** :
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- files from the project : `#include "relative/path/to/the/file.h"`
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- external files and std : `#include <file.h>`
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- Only use [primary spellings for operators and tokens](https://en.cppreference.com/w/cpp/language/operator_alternative)
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- 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.
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- Examples:
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- `auto* app = static_cast<DisplayApp*>(instance);`
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- `auto number = static_cast<uint8_t>(variable);`
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- `uint8_t returnValue = MyFunction();`
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- Use nullptr instead of NULL
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