What is the difference between ostringstream and std::stringstream

The differences are: 1. Different header files; 2. Different life cycle management; 3. Different error handling; 4. Different efficiency; 5. Different usage methods.

ostringstream and std::stringstream are both classes in the C standard library, used to handle string input/output operations. They have some similarities, but also some key differences.

Including different header files

ostringstream is part of the C standard library header file, while std::stringstream is the C standard library header Deprecated portion of the file.

Different life cycle management

std::stringstream automatically manages the life cycle of the string when it is created, which means that at the end of the life cycle of the stream, the relevant The string will also be destroyed. Ostringstream will copy the data to a new string by calling the str() method after writing the data to the stream, so that the life cycle of the string can be managed independently of the life cycle of the stream.

Error handling is different

When writing data to std::stringstream, it may throw an exception if an error occurs (such as out of memory). Ostringstream does not throw an exception, but sets an error status code to indicate that an error has occurred. You can use the ostringstream::rdstate() method to check the status of the stream.

Different efficiency

Because ostringstream needs to call the str() method to copy the data after writing the data, it is slightly slower than std::stringstream. However, for most applications this difference is acceptable.

Different usage methods

std::stringstream can use the operator << to insert data, and ostringstream also supports this operation. In addition, ostringstream also provides many other methods, such as write(), setf(), unsetf(), precision(), etc., which are more flexible in use.

ostringstream and std::stringstream both have their own advantages and applicable scenarios. When choosing which class to use, you need to make a decision based on your specific needs and circumstances.

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