116 lines
2.9 KiB
Markdown
116 lines
2.9 KiB
Markdown
[filebuf.cons]
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# 31 Input/output library [[input.output]](./#input.output)
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## 31.10 File-based streams [[file.streams]](file.streams#filebuf.cons)
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### 31.10.3 Class template basic_filebuf [[filebuf]](filebuf#cons)
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#### 31.10.3.2 Constructors [filebuf.cons]
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[ð](#lib:basic_filebuf,constructor)
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`basic_filebuf();
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`
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[1](#1)
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[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iostreams.tex#L11093)
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*Effects*: Initializes the base class withbasic_streambuf<charT, traits>() ([[streambuf.cons]](streambuf.cons "31.6.3.2 Constructors"))[.](#1.sentence-1)
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[2](#2)
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[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iostreams.tex#L11098)
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*Postconditions*: is_open() == false[.](#2.sentence-1)
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[ð](#lib:basic_filebuf,constructor_)
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`basic_filebuf(basic_filebuf&& rhs);
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`
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[3](#3)
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[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iostreams.tex#L11109)
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*Effects*: It is implementation-defined whether the sequence pointers in *this (eback(), gptr(), egptr(),pbase(), pptr(), epptr()) obtain
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the values which rhs had[.](#3.sentence-1)
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Whether they do or not, *this and rhs reference separate buffers (if any at all) after the
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construction[.](#3.sentence-2)
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Additionally *this references the file
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which rhs did before the construction, andrhs references no file after the construction[.](#3.sentence-3)
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The
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openmode, locale and any other state of rhs is also
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copied[.](#3.sentence-4)
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[4](#4)
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[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iostreams.tex#L11123)
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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.sentence-1)
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- [(4.1)](#4.1)
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is_open() == rhs_p.is_open()
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- [(4.2)](#4.2)
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rhs_a.is_open() == false
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- [(4.3)](#4.3)
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gptr() - eback() == rhs_p.gptr() - rhs_p.eback()
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- [(4.4)](#4.4)
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egptr() - eback() == rhs_p.egptr() - rhs_p.eback()
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- [(4.5)](#4.5)
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pptr() - pbase() == rhs_p.pptr() - rhs_p.pbase()
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- [(4.6)](#4.6)
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epptr() - pbase() == rhs_p.epptr() - rhs_p.pbase()
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- [(4.7)](#4.7)
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if (eback()) eback() != rhs_a.eback()
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- [(4.8)](#4.8)
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if (gptr()) gptr() != rhs_a.gptr()
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- [(4.9)](#4.9)
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if (egptr()) egptr() != rhs_a.egptr()
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- [(4.10)](#4.10)
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if (pbase()) pbase() != rhs_a.pbase()
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- [(4.11)](#4.11)
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if (pptr()) pptr() != rhs_a.pptr()
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- [(4.12)](#4.12)
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if (epptr()) epptr() != rhs_a.epptr()
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[ð](#lib:basic_filebuf,destructor)
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`virtual ~basic_filebuf();
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`
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[5](#5)
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[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iostreams.tex#L11151)
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*Effects*: Callsclose()[.](#5.sentence-1)
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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]](res.on.exception.handling "16.4.6.14 Restrictions on exception handling"))[.](#5.sentence-2)
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