Best way to empty stringstream?

c++ stl stringstream
anon picture anon · May 7, 2009 · Viewed 39.2k times · Source

One of the possibilities is:

somestringstream.str("");

But is it most optimal? Is there any way to preserve stringstream internal buffer, so that following operator<<() calls would not require to reserve memory again?

Answer

Brian R. Bondy picture Brian R. Bondy · May 7, 2009

I've always done:

s.clear();//clear any bits set
s.str(std::string());

@litb gets into more detail about how to seekp to the start of the stream combined with std::ends you can keep your allocated size.

Related questions

How to construct a std::string from a std::vector<string>?

I'd like to build a std::string from a std::vector<std::string>. I could use std::stringsteam, but imagine there is a shorter way: std::string string_from_vector(const std::vector<std::string> &…

Read More
Writing stringstream contents into ofstream

I'm currently using std::ofstream as follows: std::ofstream outFile; outFile.open(output_file); Then I attempt to pass a std::stringstream object to outFile as follows: GetHolesResults(..., std::ofstream &outFile){ float x = 1234; std::stringstream ss; ss << …

Read More
Copy data from fstream to stringstream with no buffer?

Is there anyway I can transfer data from an fstream (a file) to a stringstream (a stream in the memory)? Currently, I'm using a buffer, but this requires double the memory, because you need to copy the data to a …

Read More