Postcondition
A postcondition is a property or condition that must hold after an operation completes successfully.
Software Design for Python Programmers
A postcondition is a state or Boolean condition that must be true when a function or operation returns.
- How it is used
- Uses postconditions to specify and verify what functions and use cases guarantee after successful completion.
- How deep it goes
- Defines Boolean return conditions, applies them to circular-buffer methods, and notes exceptions as an alternative failure contract.
- Examples
- Uses a catalogue-search use case and circular-buffer add() and remove() operations as concrete postcondition examples.
- What you can do after
- Diagnose/debug with it by checking promised states at function return and choosing failure behavior when those states cannot be established.
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Object-Oriented Software Design in C++
A state that is expected to hold when a use case or function finishes or returns.
- How it is used
- Defines successful completion for functions and use cases, letting callers rely on the promised resulting state.
- How deep it goes
- Explains Boolean conditions, checked CircularBuffer invariants, exceptions, and subclass compatibility; it stops short of general verification techniques.
- Examples
- Uses CircularBuffer operations, Shipment subclasses, shipping-day ranges, and a catalogue-search use case.
- What you can do after
- Evaluate whether functions and use cases leave their promised state, and diagnose incompatible subclass contracts.
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Related concepts
- check blockcontrasts with · A Terraform configuration block that evaluates infrastructure assertions and reports failures without stopping Terraform execution.
- preconditioncontrasts with · A precondition is a condition or requirement that must be satisfied before an operation, process, or action can proceed correctly.
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