hyz0906 Undeclared Identifier Skill
Fixes errors where a symbol is used but not declared in the current scope.
Detection Patterns
use of undeclared identifier 'X''X' was not declared in this scopeerror: 'X' undeclared
Strategy
- Extract Identifier: Get the undeclared symbol name.
- Classify Symbol: Is it a standard library symbol, project symbol, or macro?
- Find Definition: Search the codebase for where this symbol is defined.
- Add Include/Import: Add the necessary #include or using statement.
Instructions
Step 1: Identify the Symbol
Parse the error message to extract the undeclared identifier.
Step 2: Check Standard Library
Common C++ standard library symbols:
| Symbol | Header | Namespace |
|---|---|---|
vector |
<vector> |
std:: |
string |
<string> |
std:: |
cout, cin, endl |
<iostream> |
std:: |
map, unordered_map |
<map>, <unordered_map> |
std:: |
unique_ptr, shared_ptr |
<memory> |
std:: |
thread, mutex |
<thread>, <mutex> |
std:: |
LOG, ALOG* |
<android/log.h> |
- |
Step 3: Search Project for Definition
If not a standard symbol, search the codebase:
grep -r "class X" --include="*.h"
grep -r "struct X" --include="*.h"
grep -r "#define X" --include="*.h"
Step 4: Apply Fix
Add the appropriate #include at the top of the file:
#include <vector> // For std::vector
#include "project/MyClass.h" // For project symbols
Or add namespace qualifier:
std::vector<int> items; // Instead of: vector<int> items;