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Declaring the const-ness of a parameter is just another form of type safety. It is almost as if a const std::string, for example, is a different class than an ordinary std::string, since the const variant is missing the various mutative operations in the non-const variant (e.g., you can imagine that a const std::string simply doesn’t have an assignment operator).

If you find ordinary type safety helps you get systems correct (it does; especially in large systems), you’ll find const correctness helps also.

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Related Blog Items

• How can inline functions help with the tradeoff of safety vs. speed?
• const correctness
• What's the difference between "const X* p", "X* const p" and "const X* const p"?
• Differences between new, malloc; delete, free
• Constant and Volatile

This entry was written by ponnada and posted on December 8, 2006 at 3:34 pm and filed under Types, Declarations & Expressions. Bookmark the permalink. Follow any comments here with the RSS feed for this post. Post a comment or leave a trackback: Trackback URL.