Working with String Tokenizer

為何寫 StringTokenizer class in C++?

1. C++ STL 沒有現成的 StringTokenizer。

2. Standard C 中雖然有 strtok() 函式，可惜設計不良。理由：Give one entity one cohesive responsibility. strtok() 擁有太多責任了：(1) Tests if there are more tokens available from this tokenizer's string. (2) Returns the next token from this string tokenizer.

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怎麼寫 StringTokenizer class?

1. 介面可以參考 Java StringTokenizer utility class. 說穿了，StringTokenizer 就是一種 Iterator. The intent of iterator: Provide a way tto access the elements of an aggregate object sequentially without exposing its underlying representation. [GOF]

2. Unit testing 可以參考 Google
chrome / trunk / src / base / string_tokenizer_unittest.cc.

3. 實做可以參考 Google
chrome / trunk / src / base / string_tokenizer.h.

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Good artists copy, great artists steal. 哈哈，別再自己造輪子了。