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Expert C++ - Second Edition
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Design patterns are powerful solutions that can be used to solve common software problems. Given the amount of study that has gone into them, they can produce scalable, maintainable, and flexible code. Despite this, they must be applied appropriately for the patterns to be useful. The following are some considerations to make sure that patterns are applied appropriately.
When applying a design pattern, it is essential to consider the problem at hand and all the requirements involved. Once understood, they must be contrasted with the patterns being considered and the problem they are designed to resolve. Patterns are general solutions, so they may or may not match the precise requirements of the problem at hand.
Each pattern has a series of positive effects and also some drawbacks. When applying a pattern, it is important to consider the trade-offs related to code complexity and potential performance issues.