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string streams
Why would a programmer want to use string streams, specifically objects of istrstream and ostrstream classes, for handling input to and output of a program?
To simplify formatting.
For example, there is a ragged table:
Each line has different number of values. Not known beforehand.
We can std::getline one line into std::string. Then read integers via istringstream. Repeat for each line.
Besides, not all I/O is with console or file. You are reading this post with a browser, don't you? The browser receives HTML string from network connection. Then it has to parse the "input". Not reading a file, not waiting for the user to type. Yet, a browser could open a local file. Therefore, the parsing code probably takes a generic istream and it is called with either ifstream or istringstream object.
For example, there is a ragged table:
1 3 7 4 6 2 2 9 8 |
Each line has different number of values. Not known beforehand.
We can std::getline one line into std::string. Then read integers via istringstream. Repeat for each line.
Besides, not all I/O is with console or file. You are reading this post with a browser, don't you? The browser receives HTML string from network connection. Then it has to parse the "input". Not reading a file, not waiting for the user to type. Yet, a browser could open a local file. Therefore, the parsing code probably takes a generic istream and it is called with either ifstream or istringstream object.
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| specifically objects of istrstream and ostrstream classes |
Actually, you should specifically not use these classes as they have been deprecated in favour of std::istringsteam and std::ostringstream.
Given they were deprecated over a decade and a half ago, your question is a bit dated!
Andy
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