27 Input/output library [input.output]

27.8 String-based streams [string.streams]

27.8.5 Class template basic_­stringstream [stringstream]

27.8.5.1 basic_­stringstream constructors [stringstream.cons]

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explicit basic_stringstream(ios_base::openmode which);
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Effects: Constructs an object of class basic_­stringstream<charT, traits>, initializing the base class with basic_­iostream<charT, traits>(&sb) ([iostream.cons]) and initializing sb with basic_­stringbuf<charT, traits, Allocator>(which).
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explicit basic_stringstream( const basic_string<charT, traits, Allocator>& str, ios_base::openmode which = ios_base::out | ios_base::in);
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Effects: Constructs an object of class basic_­stringstream<charT, traits>, initializing the base class with basic_­iostream<charT, traits>(&sb) ([iostream.cons]) and initializing sb with basic_­stringbuf<charT, traits, Allocator>(str, which).
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basic_stringstream(basic_stringstream&& rhs);
3
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Effects: Move constructs from the rvalue rhs.
This is accomplished by move constructing the base class, and the contained basic_­stringbuf.
Next basic_­istream<charT, traits>​::​set_­rdbuf(&sb) is called to install the contained basic_­stringbuf.