cppdraft_translate/cppdraft/filebuf/cons.md

[filebuf.cons]

31 Input/output library [input.output]

31.10 File-based streams [file.streams]

31.10.3 Class template basic_filebuf [filebuf]

31.10.3.2 Constructors [filebuf.cons]

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basic_filebuf();

1

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Effects: Initializes the base class withbasic_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, andrhs 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 ofrhs 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: Callsclose().

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]).