# Autofix Namespace

> Fixes 'not a member of namespace' errors by adding namespace qualifiers or using declarations.

- Skill: `hyz0906/autofix-namespace` (Agent Skill)
- Install (CLI): `npx skillmds@latest add hyz0906/autofix-namespace`
- Raw SKILL.md: https://api.skillmd.com/api/skills/hyz0906/autofix-namespace/raw
- Safety review: pending (external: skill-scanner PASS, skillspector PASS)
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: hyz0906 (https://skillmd.com/u/hyz0906)
- Updated: 2026-09-10
- Page: https://skillmd.com/skills/hyz0906/autofix-namespace

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# Namespace Skill

Fixes C++ namespace-related compilation errors.

## Detection Patterns
- `'X' is not a member of 'std'`
- `'X' is not a member of 'namespace'`
- `'X' was not declared in this scope` (when namespace issue)

## Strategy

1. **Identify Symbol**: Extract the symbol and expected namespace.
2. **Add Qualifier**: Prefix the symbol with namespace, or add `using`.

## Instructions

### Step 1: Parse Error
From: `'cout' is not a member of 'std'`
Symbol: `cout`, Namespace: `std`

### Step 2: Common Fixes

**Add namespace prefix:**
```cpp
// Before
cout << "Hello";  // ERROR
// After
std::cout << "Hello";
```

**Add using declaration:**
```cpp
// At top of file or function
using std::cout;
// Or
using namespace std;  // Less recommended
```

### Common std:: Symbols
| Symbol | Namespace |
|--------|-----------|
| `cout`, `cin`, `endl` | `std::` |
| `vector`, `map`, `set` | `std::` |
| `string` | `std::` |
| `unique_ptr`, `shared_ptr` | `std::` |
| `chrono::*` | `std::chrono::` |