| Language
support |
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| | We
have lots of language support for information |
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| hiding
modules |
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| | C++
classes, Ada packages, etc. |
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| | We
have essentially no language support for |
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| layering |
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| | Operating
systems provide support, primarily for |
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| reasons
of protection, not abstraction |
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| | Big
performance cost to pay for just abstraction |
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