A tool like CheckStyle assists in finding violations to coding standards that may affect maintainability such as large classes, long methods, and unused variables, to name a few. 像CheckStyle这样的工具可以协助寻找那些可影响到可维护性、与编码标准相冲突的地方,比方说,过大的类、太长的方法和未使用的变量等等。
Syntax-case solves this problem by replacing c with a unique, unused variable name when the macro expands. syntax-case解决这个问题的办法是在宏展开时将c替换为一个惟一的未使用的变量名。
// Loop until an unused name is found by appending a number to the root //通过向根追加数字不断循环,直到找到未使用的名称