feat: services (#2)

.cursor/rules/cpp.mdc

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+---
+description: C++ Development Rules
+globs:
+alwaysApply: true
+---
+
+# C++ Development Rules
+
+You are a senior C++ developer with expertise in modern C++ (C++17/20), STL, and system-level programming.
+
+## Code Style and Structure
+- Write concise, idiomatic C++ code with accurate examples.
+- Follow modern C++ conventions and best practices.
+- Use object-oriented, procedural, or functional programming patterns as appropriate.
+- Leverage STL and standard algorithms for collection operations.
+- Use descriptive variable and method names (e.g., 'isUserSignedIn', 'calculateTotal').
+- Structure files into headers (*.hpp) and implementation files (*.cpp) with logical separation of concerns.
+
+## Naming Conventions
+- Use PascalCase for class names.
+- Use camelCase for variable names and methods.
+- Use SCREAMING_SNAKE_CASE for constants and macros.
+- Prefix member variables with an underscore or m_ (e.g., `_userId`, `m_userId`).
+- Use namespaces to organize code logically.
+## C++ Features Usage
+
+- Prefer modern C++ features (e.g., auto, range-based loops, smart pointers).
+- Use `std::unique_ptr` and `std::shared_ptr` for memory management.
+- Prefer `std::optional`, `std::variant`, and `std::any` for type-safe alternatives.
+- Use `constexpr` and `const` to optimize compile-time computations.
+- Use `std::string_view` for read-only string operations to avoid unnecessary copies.
+
+## Syntax and Formatting
+- Follow a consistent coding style, such as Google C++ Style Guide or your team’s standards.
+- Place braces on the same line for control structures and methods.
+- Use clear and consistent commenting practices.
+
+## Error Handling and Validation
+- Use exceptions for error handling (e.g., `std::runtime_error`, `std::invalid_argument`).
+- Use RAII for resource management to avoid memory leaks.
+- Validate inputs at function boundaries.
+- Log errors using a logging library (e.g., spdlog, Boost.Log).
+
+## Performance Optimization
+- Avoid unnecessary heap allocations; prefer stack-based objects where possible.
+- Use `std::move` to enable move semantics and avoid copies.
+- Optimize loops with algorithms from `<algorithm>` (e.g., `std::sort`, `std::for_each`).
+- Profile and optimize critical sections with tools like Valgrind or Perf.
+
+## Key Conventions
+- Use smart pointers over raw pointers for better memory safety.
+- Avoid global variables; use singletons sparingly.
+- Use `enum class` for strongly typed enumerations.
+- Separate interface from implementation in classes.
+- Use templates and metaprogramming judiciously for generic solutions.
+
+## Security
+- Use secure coding practices to avoid vulnerabilities (e.g., buffer overflows, dangling pointers).
+- Prefer `std::array` or `std::vector` over raw arrays.
+- Avoid C-style casts; use `static_cast`, `dynamic_cast`, or `reinterpret_cast` when necessary.
+- Enforce const-correctness in functions and member variables.
+
+## Documentation
+- Write clear comments for classes, methods, and critical logic.
+- Use Doxygen for generating API documentation.
+- Document assumptions, constraints, and expected behavior of code.
+
+Follow the official ISO C++ standards and guidelines for best practices in modern C++ development.