31 Input/output library [input.output]

31.10 File-based streams [file.streams]

31.10.2 Class template basic_filebuf [filebuf]

31.10.2.2 Constructors [filebuf.cons]

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basic_filebuf();
1
#
Effects: Initializes the base class with basic_streambuf<charT, traits>() ([streambuf.cons]).
2
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Postconditions: is_open() == false.
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basic_filebuf(basic_filebuf&& rhs);
3
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Effects: It is implementation-defined whether the sequence pointers in *this (eback(), gptr(), egptr(), pbase(), pptr(), epptr()) obtain the values which rhs had.
Whether they do or not, *this and rhs reference separate buffers (if any at all) after the construction.
Additionally *this references the file which rhs did before the construction, and rhs references no file after the construction.
The openmode, locale and any other state of rhs is also copied.
4
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Postconditions: Let rhs_p refer to the state of rhs just prior to this construction and let rhs_a refer to the state of rhs just after this construction.
  • (4.1)
    is_open() == rhs_p.is_open()
  • (4.2)
    rhs_a.is_open() == false
  • (4.3)
    gptr() - eback() == rhs_p.gptr() - rhs_p.eback()
  • (4.4)
    egptr() - eback() == rhs_p.egptr() - rhs_p.eback()
  • (4.5)
    pptr() - pbase() == rhs_p.pptr() - rhs_p.pbase()
  • (4.6)
    epptr() - pbase() == rhs_p.epptr() - rhs_p.pbase()
  • (4.7)
    if (eback()) eback() != rhs_a.eback()
  • (4.8)
    if (gptr()) gptr() != rhs_a.gptr()
  • (4.9)
    if (egptr()) egptr() != rhs_a.egptr()
  • (4.10)
    if (pbase()) pbase() != rhs_a.pbase()
  • (4.11)
    if (pptr()) pptr() != rhs_a.pptr()
  • (4.12)
    if (epptr()) epptr() != rhs_a.epptr()
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virtual ~basic_filebuf();
5
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Effects: Calls close().
If an exception occurs during the destruction of the object, including the call to close(), the exception is caught but not rethrown (see [res.on.exception.handling]).