---
description: C++ coding standards and formatting for OpenSTA
globs: ["**/*.cc", "**/*.hh", "**/*.h"]
alwaysApply: false
---

# C++ Coding Standards

## Line Width

- **Keep lines under 90 characters** to match `.clang-format` (ColumnLimit: 90).
- Break long lines at logical points: after commas, before operators, after opening parens.

## Naming Conventions

- **Classes**: Upper camel case (`ClassName`)
- **Member functions**: Lower camel case (`memberFunction`)
- **Member variables**: Snake case with trailing underscore (`member_variable_`)
- **Functions**: Lower camel case (`functionName`)
- **Variables**: Snake case

## Code Style

- Use `#pragma once` for header guards.
- Return type on the line before the function name; arguments on separate lines when long.
- No braces for single-line if/for; use braces for multi-line bodies.
- Prefer `std::string` over `char*` for string members.
- Prefer pass-by-value and move for sink parameters (parameters that get stored).

## File Extensions

- C++ source: `.cc`
- C++ headers: `.hh`