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Don't optimize prematurely Summary Discussion Examples Exceptions References Summary Spur not a willing horse (Latin proverb): Premature optimization is as addictive as it is unproductive. The first rule of optimization is: Don't do it. The second rule of optimization (for experts only) is: Don't do it yet. Measure twice, optimize once. Discussion As [Stroustrup00 Examples Example: An inline irony. Here is a simple demonstration of the hidden cost of a premature micro-optimization: Profilers are excellent at telling you, by function hit count, what functions you should have marked inline but didn't; profilers are terrible at telling you what functions you did mark inline but shouldn't have.

Here is a simple demonstration of the hidden cost of a premature micro-optimization: Profilers are excellent at telling you, by function hit count, what functions you should have marked inline but didn't; profilers are terrible at telling you what functions you did mark inline but shouldn't have. Too many programmers "inline by default" in the name of optimization, nearly always trading higher coupling for at best dubious benefit. (This assumes that writing inline even matters on your compiler.

An entity with several disparate purposes is generally disproportionately harder to use, because it carries more than the sum of the intellectual overhead, complexity, and bugs of its parts. Such an entity is larger (often without good reason) and harder to use and reuse. Also, such an entity often offers crippled interfaces for any of its specific purposes because the partial overlap among various areas of functionality blurs the vision needed for crisply implementing each. Entities with disparate responsibilities are typically hard to design and implement.

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C++ Coding Standards 101 Rules Guidelines by AndreiAlexandrescu


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