From the daily archives: Thursday, March 13, 2008
如果掌握一个库函数所需要的努力接近于编写应用程序的精力，程序员很可能为了方便而重新实现他们所需要的那部分库函数。
程序库的设计和实现是很困难的，设计者必须小心处理通用性，简单性，和有效性的问题。如果一个程序库例程和数据结构太通用了，就有可能导致使用困难。或者难以达到想要的目的。如果太简单了，可能不满足应用程序的需求。如果他们太容易混淆，编程者也不会使用。C语言库本身有一些容易混淆的例子，比如realloc函数。
David R. Hanson大师如是说。
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