Implement Commutative Scalar Multiplication In C

What the source does

• FilesystemNone observedNo reads or writes in the source
• NetworkNone observedNo outbound calls in the source
• ShellNone observedNo commands run in the source
• DependenciesPinnedNothing floats
• SecretsNone foundNo keys in source

Five audit layers

Gates applied: no behavioural pass.

Audit 0.4.1 · source sha 04e912cff54b · 14 Oct 2026Report an issue or request a re-scan

• PublisherECNU-ICALK GitHub organizationOwner of the repository this skill is read from
• Source folderECNU-ICALK/AutoSkill/SkillBank/ConvSkill/english_gpt4_8_GLM4.7/implement-commutative-scalar-multiplication-in-cThe exact folder we audited
• LicenceNot declaredAs the repository states it
• Commit pinned for this verdict04e912cff54bA new audit runs when the source changes
• Repository statusNot archivedLast push 157 days ago
• Sandboxed runNot runSkills are read, not executed; layer L4 is skipped

Its description: Implements scalar multiplication for a custom C++ class to support both `Object * Scalar` and `Scalar * Object` syntax by defining a member function and a non-member friend function.

---
id: "12826ea8-4e23-4662-a19f-d9df1b2dc148"
name: "Implement Commutative Scalar Multiplication in C++"
description: "Implements scalar multiplication for a custom C++ class to support both `Object * Scalar` and `Scalar * Object` syntax by defining a member function and a non-member friend function."
version: "0.1.0"
tags:
  - "c++"
  - "operator-overloading"
  - "scalar-multiplication"
  - "commutativity"
triggers:
  - "implement universal operator*"
  - "commutative scalar multiplication"
  - "make operator* work both ways"
  - "scalar * object syntax"
---

# Implement Commutative Scalar Multiplication in C++

Implements scalar multiplication for a custom C++ class to support both `Object * Scalar` and `Scalar * Object` syntax by defining a member function and a non-member friend function.

## Prompt

# Role & Objective
You are a C++ developer. Your task is to implement commutative scalar multiplication for a custom class. This means the multiplication operation should work regardless of whether the class instance or the scalar value is on the left-hand side of the operator.

# Operational Rules & Constraints
1. **Member Function**: Implement a member function `operator*(ScalarType)` within the class definition. This handles the case `Object * Scalar`.
2. **Non-Member Function**: Implement a non-member function `operator*(ScalarType, const Class&)` outside the class definition (usually in the same header file). This handles the case `Scalar * Object`.
3. **Delegation**: The non-member function should typically delegate to the member function (e.g., `return arr * num;`) to ensure consistent behavior and avoid code duplication, assuming the operation is commutative.
4. **Scope**: Ensure the non-member function is declared in the same scope as the class to allow Argument-Dependent Lookup (ADL).
5. **Const Correctness**: Ensure the member function is marked `const` if it does not modify the object.

# Anti-Patterns
- Do not rely on implicit conversions that might cause ambiguity.
- Do not implement the non-member function as a friend unless necessary for access to private members (though delegation to public member operator is preferred).

## Triggers

- implement universal operator*
- commutative scalar multiplication
- make operator* work both ways
- scalar * object syntax

Excerpt, first 2,315 characters of SKILL.md, verbatim from the audited commit. It is text from someone else’s repository, quoted so you can judge it before your agent reads it.

git clone https://github.com/ECNU-ICALK/AutoSkill
git -C AutoSkill checkout 04e912cff54b

Works in

1. 2026-10-14
   ✓SAFE B 89 / 100

   first audit · source 04e912cff54b

Questions about Implement Commutative Scalar Multiplication In C

• github.com/ECNU-ICALK/AutoSkill/tree/main/SkillBank/ConvSkill/en — the audited source at commit 04e912cff54b and every finding aboveObserved · 14 Oct 2026

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