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b6595974c2
- agents: cpp-build-resolver, cpp-reviewer - commands: cpp-build, cpp-review, cpp-test - rules: cpp/ (coding-style, hooks, patterns, security, testing) - tests: 9 new hook test files with comprehensive coverage Cherry-picked from PR #436.
52 lines
1.3 KiB
Markdown
52 lines
1.3 KiB
Markdown
---
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paths:
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- "**/*.cpp"
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- "**/*.hpp"
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- "**/*.cc"
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- "**/*.hh"
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- "**/*.cxx"
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- "**/*.h"
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- "**/CMakeLists.txt"
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---
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# C++ Patterns
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> This file extends [common/patterns.md](../common/patterns.md) with C++ specific content.
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## RAII (Resource Acquisition Is Initialization)
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Tie resource lifetime to object lifetime:
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```cpp
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class FileHandle {
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public:
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explicit FileHandle(const std::string& path) : file_(std::fopen(path.c_str(), "r")) {}
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~FileHandle() { if (file_) std::fclose(file_); }
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FileHandle(const FileHandle&) = delete;
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FileHandle& operator=(const FileHandle&) = delete;
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private:
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std::FILE* file_;
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};
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```
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## Rule of Five/Zero
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- **Rule of Zero**: Prefer classes that need no custom destructor, copy/move constructors, or assignments
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- **Rule of Five**: If you define any of destructor/copy-ctor/copy-assign/move-ctor/move-assign, define all five
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## Value Semantics
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- Pass small/trivial types by value
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- Pass large types by `const&`
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- Return by value (rely on RVO/NRVO)
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- Use move semantics for sink parameters
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## Error Handling
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- Use exceptions for exceptional conditions
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- Use `std::optional` for values that may not exist
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- Use `std::expected` (C++23) or result types for expected failures
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## Reference
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See skill: `cpp-coding-standards` for comprehensive C++ patterns and anti-patterns.
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