To manage strings, the class uses the standard C++(www.cppentry.com) string and vector classes rather than C-style strings. There is no non-existent state for a string: “empty” means only that the length is zero, and there is no equivalent of NULL, so we can’t use that as an end of file signal. Thus Csv::getline returns the input line through an argument by reference, reserving the function value itself for end of file and error reports.

The += operator is overloaded to append a character to a string.

Minor changes are needed in endofline. Again, we have to read the input a character at a time, since none of the standard input routines can handle the variety of inputs.

 

【责任编辑：王苑 TEL：（010）68476606】