What does “abstractions should not depend on details” actually mean?

softwareengineering.stackexchange https://softwareengineering.stackexchange.com/questions/64932

  •  31-10-2019
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문제

Most readers will be familiar with Bob Martin's famous dependency inversion principle, which states -

  1. High-level modules should not depend on low-level modules. Both should depend on abstractions

  2. Abstractions should not depend upon details. Details should depend upon abstractions

I believe I understand it all pretty well, except for the first sentence in the second line - "Abstractions should not depend upon details". What does this mean exactly? What would be a simple example of an abstraction being dependent upon a detail?

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