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m09-domain

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Atualizado25 de janeiro de 2026 às 07:37

Mastering C++ Domain Modeling (DDD). Triggers: Entity, Value Object, Aggregate, Repository, Pimpl, Class Design, Invariant.

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13eholder

13eholder/Modern-Cpp-Skills

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Desenvolvedores de softwareInformática e Matemática·SOC 15-1252

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SKILL.md

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name	m09-domain
description	Mastering C++ Domain Modeling (DDD). Triggers: Entity, Value Object, Aggregate, Repository, Pimpl, Class Design, Invariant.

C++ Domain Modeling

Core Question

Identity or Value?

Value Object: Defined by attributes (Color, Money). Equality via comparison. Copyable.
Entity: Defined by Identity (User, Socket). Equality via ID. Non-copyable (usually).

Error → Design Question

Issue	Design Question
Data Inconsistency	Are public fields allowing invalid states?
Object Slicing	Are you passing polymorphic Entities by Value?
Header Hell	Are you leaking implementation details? (Use Pimpl).

Thinking Prompt

Is it copyable?
- Yes? → Value Type (Rule of Zero, defaults).
- No? → Entity (Delete copy ctor, enable move).
Does it have invariants?
- Yes? → class with private data + public methods.
- No? → struct (POD).
Does it own others?
- Aggregate Root? → Owns children via std::vector / unique_ptr.

Trace Up / Down

Trace Down:
- Intent: "User has a Name and an Address."
- Code: class User (Entity) holds Name (Value) and Address (Value).

Quick Reference

Pattern	C++ Implementation
Value Object	`struct` + `operator<=>`.
Entity	`class` + Deleted Copy + ID field.
Repository	Pure Virtual Interface (`virtual ... = 0`).
Aggregate	Parent class owning children.

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name	m09-domain
description	Mastering C++ Domain Modeling (DDD). Triggers: Entity, Value Object, Aggregate, Repository, Pimpl, Class Design, Invariant.

C++ Domain Modeling

Core Question

Identity or Value?

Value Object: Defined by attributes (Color, Money). Equality via comparison. Copyable.
Entity: Defined by Identity (User, Socket). Equality via ID. Non-copyable (usually).

Error → Design Question

Issue	Design Question
Data Inconsistency	Are public fields allowing invalid states?
Object Slicing	Are you passing polymorphic Entities by Value?
Header Hell	Are you leaking implementation details? (Use Pimpl).

Thinking Prompt

Is it copyable?
- Yes? → Value Type (Rule of Zero, defaults).
- No? → Entity (Delete copy ctor, enable move).
Does it have invariants?
- Yes? → class with private data + public methods.
- No? → struct (POD).
Does it own others?
- Aggregate Root? → Owns children via std::vector / unique_ptr.

Trace Up / Down

Trace Down:
- Intent: "User has a Name and an Address."
- Code: class User (Entity) holds Name (Value) and Address (Value).

Quick Reference

Pattern	C++ Implementation
Value Object	`struct` + `operator<=>`.
Entity	`class` + Deleted Copy + ID field.
Repository	Pure Virtual Interface (`virtual ... = 0`).
Aggregate	Parent class owning children.