# TICKET-PMAT-7013: C++ Mutation Testing

**Ticket ID:** PMAT-7013
**Sprint:** 109
**Status:** ACTIVE
**Priority:** HIGH
**Created:** 2025-10-09
**Assignee:** EXTREME TDD Implementation
**Related Tickets:** PMAT-7010 (TypeScript), PMAT-7011 (Python), PMAT-7012 (Go)

---

## 📋 TICKET SUMMARY

Implement production-ready **C++ mutation testing** using tree-sitter AST parsing and EXTREME TDD methodology (RED → GREEN → REFACTOR). This is the **4th language** in the multi-language mutation testing initiative.

**Target:** 80%+ mutation score achievable on well-tested C++ codebases.

---

## 🎯 ACCEPTANCE CRITERIA

### RED Phase (Failing Tests)
- [ ] Create C++ test fixtures (`fixtures/cpp/calculator.cpp`, `calculator.hpp`, `test_calculator.cpp`)
- [ ] Create stub implementations with `#[ignore]` tests
  - [ ] `cpp_tree_sitter_mutations.rs` - 7 stub operators
  - [ ] `cpp_mutation_generator.rs` - stub generator
- [ ] Update type system for C++ operators (pointer, member access)
- [ ] Verify compilation with `cargo build --features cpp-ast`

### GREEN Phase (Minimal Implementation)
- [ ] Implement 7 C++ mutation operators:
  1. **Binary Operator Replacement (AOR)** - `+, -, *, /, %`
  2. **Relational Operator Replacement (ROR)** - `<, >, <=, >=, ==, !=`
  3. **Logical Operator Replacement (LOR)** - `&&, ||`
  4. **Bitwise Operator Replacement (BOR)** - `&, |, ^, <<, >>, ~`
  5. **Unary Operator Replacement (UOR)** - `!, -, +, ++, --`
  6. **Pointer Operator Replacement (POR)** - `*, &, ->` (NEW)
  7. **Member Access Replacement (MAR)** - `., ::` (NEW)
- [ ] Implement `CppMutationGenerator` AST visitor
- [ ] Remove all `#[ignore]` markers
- [ ] Verify all tests pass

### REFACTOR Phase (Production Polish)
- [ ] Create workflow example (`examples/cpp_mutation_workflow.rs`)
- [ ] Write comprehensive documentation (`docs/features/CPP-MUTATION-TESTING.md`)
- [ ] Update project documentation (README.md, roadmap.md)
- [ ] Commit all changes with proper message

---

## 🏗️ TECHNICAL DESIGN

### Architecture

```
┌─────────────────────────────────────────────────────────────┐
│                  C++ Mutation Testing                        │
├─────────────────────────────────────────────────────────────┤
│                                                              │
│  ┌──────────────────────────────────────────────────────┐  │
│  │         CppMutationGenerator                         │  │
│  │  - parse_cpp() → tree-sitter AST                     │  │
│  │  - visit_node() → recursive traversal                │  │
│  │  - generate_mutants() → Vec<Mutant>                  │  │
│  └──────────────────────────────────────────────────────┘  │
│                          ▼                                   │
│  ┌──────────────────────────────────────────────────────┐  │
│  │      TreeSitterMutationOperator Trait                │  │
│  │  - can_mutate(node) → bool                           │  │
│  │  - mutate(node) → Vec<MutatedSource>                 │  │
│  │  - name() → &str                                     │  │
│  └──────────────────────────────────────────────────────┘  │
│                          ▼                                   │
│  ┌──────────────────────────────────────────────────────┐  │
│  │           7 C++ Mutation Operators                   │  │
│  ├──────────────────────────────────────────────────────┤  │
│  │  1. CppBinaryOpMutation      (+, -, *, /, %)        │  │
│  │  2. CppRelationalOpMutation  (<, >, <=, >=, ==, !=) │  │
│  │  3. CppLogicalOpMutation     (&&, ||)               │  │
│  │  4. CppBitwiseOpMutation     (&, |, ^, <<, >>, ~)   │  │
│  │  5. CppUnaryOpMutation       (!, -, +, ++, --)      │  │
│  │  6. CppPointerOpMutation     (*, &, ->)  ⭐ NEW     │  │
│  │  7. CppMemberAccessMutation  (., ::)     ⭐ NEW     │  │
│  └──────────────────────────────────────────────────────┘  │
│                          ▼                                   │
│  ┌──────────────────────────────────────────────────────┐  │
│  │              Test Execution                          │  │
│  │  - cmake --build build                               │  │
│  │  - ctest --test-dir build                            │  │
│  │  - Mutation score calculation                        │  │
│  └──────────────────────────────────────────────────────┘  │
│                                                              │
└─────────────────────────────────────────────────────────────┘
```

### Dependencies

**Cargo.toml additions:**
```toml
[dependencies]
tree-sitter = "0.23"
tree-sitter-cpp = "0.23"

[features]
cpp-ast = ["tree-sitter-cpp"]
```

### C++-Specific Considerations

1. **Pointer Operations**: C++ has unique pointer semantics
   - Dereference: `*ptr`
   - Address-of: `&var`
   - Arrow: `ptr->member`

2. **Member Access**: Multiple member access operators
   - Dot: `obj.member`
   - Scope resolution: `Class::static_member`

3. **Pre/Post Increment**: `++i` vs `i++`
   - Different semantics, both need mutation

4. **Build System**: CMake-based testing
   - Requires CMakeLists.txt
   - Uses CTest for test execution

5. **Header Files**: Need to handle `.hpp`/`.h` separation
   - Mutate implementation files only
   - Keep header files unchanged

---

## 📁 FILE STRUCTURE

### New Files (RED Phase)

```
fixtures/cpp/
├── calculator.hpp                  # Header with function declarations
├── calculator.cpp                  # Implementation with 22 functions
├── test_calculator.cpp             # Google Test tests
└── CMakeLists.txt                  # Build configuration

server/src/services/mutation/
├── cpp_tree_sitter_mutations.rs    # 7 mutation operators (~850 LOC)
└── cpp_mutation_generator.rs       # AST visitor (~180 LOC)

server/examples/
└── cpp_mutation_workflow.rs        # End-to-end workflow (~250 LOC)

docs/features/
└── CPP-MUTATION-TESTING.md         # User guide (~900 LOC)
```

---

## 🧪 TEST FIXTURES

### fixtures/cpp/calculator.hpp

```cpp
// calculator.hpp
#ifndef CALCULATOR_HPP
#define CALCULATOR_HPP

class Calculator {
public:
    // Arithmetic operators (AOR)
    static int Add(int a, int b);
    static int Subtract(int a, int b);
    static int Multiply(int a, int b);
    static int Divide(int a, int b);
    static int Modulo(int a, int b);

    // Relational operators (ROR)
    static bool GreaterThan(int a, int b);
    static bool LessThan(int a, int b);
    static bool GreaterOrEqual(int a, int b);
    static bool LessOrEqual(int a, int b);
    static bool Equal(int a, int b);
    static bool NotEqual(int a, int b);

    // Logical operators (LOR)
    static bool And(bool a, bool b);
    static bool Or(bool a, bool b);

    // Bitwise operators (BOR)
    static int BitwiseAnd(int a, int b);
    static int BitwiseOr(int a, int b);
    static int BitwiseXor(int a, int b);
    static int LeftShift(int a, int shift);
    static int RightShift(int a, int shift);
    static int BitwiseNot(int a);

    // Unary operators (UOR)
    static bool Not(bool value);
    static int Negate(int value);
    static int UnaryPlus(int value);

    // Pointer operators (POR) - NEW
    static int Dereference(int* ptr);
    static int* AddressOf(int& value);
    static int AccessMember(Calculator* calc, int (Calculator::*func)());

    // Member access (MAR) - NEW
    int instanceValue;
    static int staticValue;
    int GetValue();
    static int GetStaticValue();
};

#endif // CALCULATOR_HPP
```

### fixtures/cpp/calculator.cpp

```cpp
// calculator.cpp
#include "calculator.hpp"

// Static member initialization
int Calculator::staticValue = 42;

// Arithmetic operators
int Calculator::Add(int a, int b) {
    return a + b;
}

int Calculator::Subtract(int a, int b) {
    return a - b;
}

int Calculator::Multiply(int a, int b) {
    return a * b;
}

int Calculator::Divide(int a, int b) {
    if (b == 0) return 0;
    return a / b;
}

int Calculator::Modulo(int a, int b) {
    if (b == 0) return 0;
    return a % b;
}

// Relational operators
bool Calculator::GreaterThan(int a, int b) {
    return a > b;
}

bool Calculator::LessThan(int a, int b) {
    return a < b;
}

bool Calculator::GreaterOrEqual(int a, int b) {
    return a >= b;
}

bool Calculator::LessOrEqual(int a, int b) {
    return a <= b;
}

bool Calculator::Equal(int a, int b) {
    return a == b;
}

bool Calculator::NotEqual(int a, int b) {
    return a != b;
}

// Logical operators
bool Calculator::And(bool a, bool b) {
    return a && b;
}

bool Calculator::Or(bool a, bool b) {
    return a || b;
}

// Bitwise operators
int Calculator::BitwiseAnd(int a, int b) {
    return a & b;
}

int Calculator::BitwiseOr(int a, int b) {
    return a | b;
}

int Calculator::BitwiseXor(int a, int b) {
    return a ^ b;
}

int Calculator::LeftShift(int a, int shift) {
    return a << shift;
}

int Calculator::RightShift(int a, int shift) {
    return a >> shift;
}

int Calculator::BitwiseNot(int a) {
    return ~a;
}

// Unary operators
bool Calculator::Not(bool value) {
    return !value;
}

int Calculator::Negate(int value) {
    return -value;
}

int Calculator::UnaryPlus(int value) {
    return +value;
}

// Pointer operators
int Calculator::Dereference(int* ptr) {
    return *ptr;
}

int* Calculator::AddressOf(int& value) {
    return &value;
}

int Calculator::AccessMember(Calculator* calc, int (Calculator::*func)()) {
    return (calc->*func)();
}

// Member access
int Calculator::GetValue() {
    return this->instanceValue;
}

int Calculator::GetStaticValue() {
    return Calculator::staticValue;
}
```

### fixtures/cpp/test_calculator.cpp

```cpp
// test_calculator.cpp
#include <gtest/gtest.h>
#include "calculator.hpp"

// Arithmetic operator tests
TEST(CalculatorTest, Add) {
    EXPECT_EQ(Calculator::Add(2, 3), 5);
    EXPECT_EQ(Calculator::Add(-1, -1), -2);
    EXPECT_EQ(Calculator::Add(0, 5), 5);
    EXPECT_EQ(Calculator::Add(-3, 5), 2);
}

TEST(CalculatorTest, Subtract) {
    EXPECT_EQ(Calculator::Subtract(5, 3), 2);
    EXPECT_EQ(Calculator::Subtract(-1, -1), 0);
    EXPECT_EQ(Calculator::Subtract(0, 5), -5);
    EXPECT_EQ(Calculator::Subtract(-3, 5), -8);
}

TEST(CalculatorTest, Multiply) {
    EXPECT_EQ(Calculator::Multiply(2, 3), 6);
    EXPECT_EQ(Calculator::Multiply(-2, 3), -6);
    EXPECT_EQ(Calculator::Multiply(0, 5), 0);
    EXPECT_EQ(Calculator::Multiply(-2, -3), 6);
}

TEST(CalculatorTest, Divide) {
    EXPECT_EQ(Calculator::Divide(6, 3), 2);
    EXPECT_EQ(Calculator::Divide(-6, 3), -2);
    EXPECT_EQ(Calculator::Divide(5, 2), 2);
    EXPECT_EQ(Calculator::Divide(5, 0), 0); // Division by zero handling
}

TEST(CalculatorTest, Modulo) {
    EXPECT_EQ(Calculator::Modulo(7, 3), 1);
    EXPECT_EQ(Calculator::Modulo(10, 5), 0);
    EXPECT_EQ(Calculator::Modulo(5, 2), 1);
    EXPECT_EQ(Calculator::Modulo(5, 0), 0); // Modulo by zero handling
}

// Relational operator tests
TEST(CalculatorTest, GreaterThan) {
    EXPECT_TRUE(Calculator::GreaterThan(5, 3));
    EXPECT_FALSE(Calculator::GreaterThan(3, 5));
    EXPECT_FALSE(Calculator::GreaterThan(3, 3));
}

TEST(CalculatorTest, LessThan) {
    EXPECT_TRUE(Calculator::LessThan(3, 5));
    EXPECT_FALSE(Calculator::LessThan(5, 3));
    EXPECT_FALSE(Calculator::LessThan(3, 3));
}

TEST(CalculatorTest, GreaterOrEqual) {
    EXPECT_TRUE(Calculator::GreaterOrEqual(5, 3));
    EXPECT_TRUE(Calculator::GreaterOrEqual(3, 3));
    EXPECT_FALSE(Calculator::GreaterOrEqual(3, 5));
}

TEST(CalculatorTest, LessOrEqual) {
    EXPECT_TRUE(Calculator::LessOrEqual(3, 5));
    EXPECT_TRUE(Calculator::LessOrEqual(3, 3));
    EXPECT_FALSE(Calculator::LessOrEqual(5, 3));
}

TEST(CalculatorTest, Equal) {
    EXPECT_TRUE(Calculator::Equal(3, 3));
    EXPECT_FALSE(Calculator::Equal(3, 5));
}

TEST(CalculatorTest, NotEqual) {
    EXPECT_TRUE(Calculator::NotEqual(3, 5));
    EXPECT_FALSE(Calculator::NotEqual(3, 3));
}

// Logical operator tests
TEST(CalculatorTest, And) {
    EXPECT_TRUE(Calculator::And(true, true));
    EXPECT_FALSE(Calculator::And(true, false));
    EXPECT_FALSE(Calculator::And(false, true));
    EXPECT_FALSE(Calculator::And(false, false));
}

TEST(CalculatorTest, Or) {
    EXPECT_TRUE(Calculator::Or(true, true));
    EXPECT_TRUE(Calculator::Or(true, false));
    EXPECT_TRUE(Calculator::Or(false, true));
    EXPECT_FALSE(Calculator::Or(false, false));
}

// Bitwise operator tests
TEST(CalculatorTest, BitwiseAnd) {
    EXPECT_EQ(Calculator::BitwiseAnd(5, 3), 1);  // 101 & 011 = 001
    EXPECT_EQ(Calculator::BitwiseAnd(12, 10), 8); // 1100 & 1010 = 1000
}

TEST(CalculatorTest, BitwiseOr) {
    EXPECT_EQ(Calculator::BitwiseOr(5, 3), 7);   // 101 | 011 = 111
    EXPECT_EQ(Calculator::BitwiseOr(12, 10), 14); // 1100 | 1010 = 1110
}

TEST(CalculatorTest, BitwiseXor) {
    EXPECT_EQ(Calculator::BitwiseXor(5, 3), 6);   // 101 ^ 011 = 110
    EXPECT_EQ(Calculator::BitwiseXor(12, 10), 6); // 1100 ^ 1010 = 0110
}

TEST(CalculatorTest, LeftShift) {
    EXPECT_EQ(Calculator::LeftShift(5, 1), 10);  // 101 << 1 = 1010
    EXPECT_EQ(Calculator::LeftShift(3, 2), 12);  // 011 << 2 = 1100
}

TEST(CalculatorTest, RightShift) {
    EXPECT_EQ(Calculator::RightShift(10, 1), 5); // 1010 >> 1 = 101
    EXPECT_EQ(Calculator::RightShift(12, 2), 3); // 1100 >> 2 = 011
}

TEST(CalculatorTest, BitwiseNot) {
    EXPECT_EQ(Calculator::BitwiseNot(5), ~5);
    EXPECT_EQ(Calculator::BitwiseNot(0), -1);
}

// Unary operator tests
TEST(CalculatorTest, Not) {
    EXPECT_FALSE(Calculator::Not(true));
    EXPECT_TRUE(Calculator::Not(false));
}

TEST(CalculatorTest, Negate) {
    EXPECT_EQ(Calculator::Negate(5), -5);
    EXPECT_EQ(Calculator::Negate(-5), 5);
    EXPECT_EQ(Calculator::Negate(0), 0);
}

TEST(CalculatorTest, UnaryPlus) {
    EXPECT_EQ(Calculator::UnaryPlus(5), 5);
    EXPECT_EQ(Calculator::UnaryPlus(-5), -5);
}

// Pointer operator tests
TEST(CalculatorTest, Dereference) {
    int value = 42;
    int* ptr = &value;
    EXPECT_EQ(Calculator::Dereference(ptr), 42);
}

TEST(CalculatorTest, AddressOf) {
    int value = 42;
    int* ptr = Calculator::AddressOf(value);
    EXPECT_EQ(*ptr, 42);
}

// Member access tests
TEST(CalculatorTest, GetValue) {
    Calculator calc;
    calc.instanceValue = 100;
    EXPECT_EQ(calc.GetValue(), 100);
}

TEST(CalculatorTest, GetStaticValue) {
    EXPECT_EQ(Calculator::GetStaticValue(), 42);
}

int main(int argc, char **argv) {
    ::testing::InitGoogleTest(&argc, argv);
    return RUN_ALL_TESTS();
}
```

### fixtures/cpp/CMakeLists.txt

```cmake
cmake_minimum_required(VERSION 3.14)
project(CalculatorTests)

# C++17 standard
set(CMAKE_CXX_STANDARD 17)
set(CMAKE_CXX_STANDARD_REQUIRED ON)

# Enable testing
enable_testing()

# Fetch Google Test
include(FetchContent)
FetchContent_Declare(
  googletest
  URL https://github.com/google/googletest/archive/refs/tags/release-1.12.1.zip
)
FetchContent_MakeAvailable(googletest)

# Add calculator library
add_library(calculator calculator.cpp)

# Add test executable
add_executable(test_calculator test_calculator.cpp)
target_link_libraries(test_calculator calculator gtest_main)

# Register tests
include(GoogleTest)
gtest_discover_tests(test_calculator)
```

---

## 🔧 MUTATION OPERATORS

### 1. Binary Operator Replacement (AOR)

**AST Node:** `binary_expression`
**Operators:** `+, -, *, /, %`

**Example:**
```cpp
// Original
int result = a + b;

// Mutants
int result = a - b;  // + → -
int result = a * b;  // + → *
int result = a / b;  // + → /
int result = a % b;  // + → %
```

### 2. Relational Operator Replacement (ROR)

**AST Node:** `binary_expression`
**Operators:** `<, >, <=, >=, ==, !=`

**Example:**
```cpp
// Original
if (x > y) { ... }

// Mutants
if (x < y) { ... }   // > → <
if (x >= y) { ... }  // > → >=
if (x <= y) { ... }  // > → <=
if (x == y) { ... }  // > → ==
if (x != y) { ... }  // > → !=
```

### 3. Logical Operator Replacement (LOR)

**AST Node:** `binary_expression`
**Operators:** `&&, ||`

**Example:**
```cpp
// Original
if (a && b) { ... }

// Mutant
if (a || b) { ... }  // && → ||
```

### 4. Bitwise Operator Replacement (BOR)

**AST Node:** `binary_expression`, `unary_expression`
**Operators:** `&, |, ^, <<, >>, ~`

**Example:**
```cpp
// Original
int flags = a & b;

// Mutants
int flags = a | b;   // & → |
int flags = a ^ b;   // & → ^
```

### 5. Unary Operator Replacement (UOR)

**AST Node:** `unary_expression`, `update_expression`
**Operators:** `!, -, +, ++, --`

**Example:**
```cpp
// Original
bool result = !flag;

// Mutants
bool result = flag;    // Remove !
int value = -x;        // + → -
int value = ++i;       // i++ → ++i
```

### 6. Pointer Operator Replacement (POR) ⭐ NEW

**AST Node:** `pointer_expression`, `subscript_expression`
**Operators:** `*, &, ->`

**Example:**
```cpp
// Original
int value = *ptr;

// Mutant
int value = ptr;       // Remove *

// Original
ptr->method();

// Mutant
(*ptr).method();       // -> → .
```

### 7. Member Access Replacement (MAR) ⭐ NEW

**AST Node:** `field_expression`, `qualified_identifier`
**Operators:** `.`, `::`

**Example:**
```cpp
// Original
obj.member = 10;

// Mutant (context-dependent)
// Cannot mutate . → :: without semantic analysis

// Original
Class::staticMethod();

// Potential mutations require type information
```

---

## 📊 EXPECTED METRICS

Based on previous implementations:

| Metric | Target | Rationale |
|--------|--------|-----------|
| Mutants Generated | ~75-85 | More operators than Go (7 vs 6) |
| Generation Time | <5ms | C++ AST slightly more complex than Go |
| Test Execution Time | ~8-10ms/mutant | CMake build overhead |
| Mutation Score | 80%+ | With comprehensive Google Test suite |
| Code Coverage | 100% | All operators exercised |

**Performance Comparison:**
- TypeScript: 67 mutants in 14ms
- Python: 56 mutants in 5.2ms
- Go: 62 mutants in <3ms (FASTEST)
- **C++: Expected ~75 mutants in <5ms** (2nd fastest)

---

## 🚧 IMPLEMENTATION CHALLENGES

### 1. Pointer Semantics
**Challenge:** Pointer operations require context awareness.
- `*ptr` - Could be multiplication or dereference
- `&var` - Could be bitwise AND or address-of

**Solution:** Use AST node types to disambiguate:
- `pointer_expression` vs `binary_expression`
- `reference_declarator` vs `binary_expression`

### 2. Member Access Mutations
**Challenge:** `.` and `::` have different semantics.
- `.` - Instance member access
- `::` - Scope resolution for static/namespace members

**Solution:**
- May skip MAR operator if semantic analysis too complex
- Focus on pointer and arithmetic operators first

### 3. Build System Integration
**Challenge:** CMake-based testing is slower than `go test` or `pytest`.

**Solution:**
- Cache build artifacts between mutant tests
- Only rebuild changed source file
- Use `cmake --build build --target test_calculator`

### 4. Header/Implementation Separation
**Challenge:** Mutating headers can break compilation.

**Solution:**
- Only mutate `.cpp` files
- Skip `.hpp`/`.h` files
- Generator checks file extension

---

## 📝 DOCUMENTATION OUTLINE

### docs/features/CPP-MUTATION-TESTING.md

```markdown
# C++ Mutation Testing

Production-ready AST-based mutation testing for C++17+.

## Quick Start

## Mutation Operators (7 operators)
1. Binary Operator Replacement (AOR)
2. Relational Operator Replacement (ROR)
3. Logical Operator Replacement (LOR)
4. Bitwise Operator Replacement (BOR)
5. Unary Operator Replacement (UOR)
6. Pointer Operator Replacement (POR) - NEW
7. Member Access Replacement (MAR) - NEW

## C++-Specific Features
- Pointer mutation support
- Pre/post increment handling
- CMake/CTest integration
- Google Test compatibility

## Troubleshooting
- CMake not found
- Google Test setup issues
- Build system errors

## Best Practices
- Header-only testing
- Comprehensive Google Test suites
- Pointer safety testing

## Performance
- Generation: <5ms for ~75 mutants
- Comparison with other tools

## Comparison with mull and mutate_cpp
```

---

## 🔄 EXTREME TDD WORKFLOW

### RED Phase Checklist
```bash
# 1. Create test fixtures
mkdir -p fixtures/cpp
# Create calculator.hpp, calculator.cpp, test_calculator.cpp, CMakeLists.txt

# 2. Create stub operators
touch server/src/services/mutation/cpp_tree_sitter_mutations.rs
touch server/src/services/mutation/cpp_mutation_generator.rs

# 3. Update type system
# Edit server/src/services/mutation/types.rs
# Add: PointerReplacement, MemberAccessReplacement

# 4. Update ML predictor
# Edit server/src/services/mutation/ml_predictor.rs
# Add numeric mappings

# 5. Update module exports
# Edit server/src/services/mutation/mod.rs

# 6. Verify compilation
cargo build --features cpp-ast
```

### GREEN Phase Checklist
```bash
# 1. Implement all 7 operators in cpp_tree_sitter_mutations.rs
# 2. Implement generator in cpp_mutation_generator.rs
# 3. Remove all #[ignore] markers
# 4. Run tests
cargo test --features cpp-ast cpp_

# 5. Verify mutant generation
cargo run --example cpp_mutation_workflow --features cpp-ast
```

### REFACTOR Phase Checklist
```bash
# 1. Create workflow example
touch server/examples/cpp_mutation_workflow.rs

# 2. Write documentation
touch docs/features/CPP-MUTATION-TESTING.md

# 3. Update README.md
# 4. Update roadmap.md (Sprint 109)

# 5. Commit
git add .
git commit -m "feat: C++ Mutation Testing (PMAT-7013)"
```

---

## 🎯 SUCCESS CRITERIA

- [ ] All 7 mutation operators implemented
- [ ] 75+ mutants generated from calculator.cpp
- [ ] <5ms generation time achieved
- [ ] All unit tests passing (14/14)
- [ ] Workflow example functional
- [ ] Documentation complete (900+ LOC)
- [ ] 80%+ mutation score on test fixtures
- [ ] Zero compilation errors
- [ ] v2.154.0 ready for release

---

## 📈 MULTI-LANGUAGE PROGRESS

- ✅ TypeScript/JavaScript (PMAT-7010) - v2.144.0
- ✅ Python (PMAT-7011) - v2.152.0
- ✅ Go (PMAT-7012) - v2.153.0
- 🔄 **C++ (PMAT-7013)** - **v2.154.0** ⚡ (CURRENT)
- ⏳ Rust (PMAT-7014) - Planned

**Progress: 4/5 (80%)**

---

## 🔗 REFERENCES

- [tree-sitter-cpp](https://github.com/tree-sitter/tree-sitter-cpp)
- [Google Test](https://github.com/google/googletest)
- [mull mutation testing](https://github.com/mull-project/mull)
- [mutate_cpp](https://github.com/nlohmann/mutate_cpp)
- PMAT-7010: TypeScript Mutation Testing
- PMAT-7011: Python Mutation Testing
- PMAT-7012: Go Mutation Testing

---

**END OF TICKET SPECIFICATION**

*Next Steps: Execute RED phase by creating C++ fixtures and stub implementations.*
