84 lines
2.0 KiB
Markdown
84 lines
2.0 KiB
Markdown
[spanbuf.cons]
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# 31 Input/output library [[input.output]](./#input.output)
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## 31.9 Span-based streams [[span.streams]](span.streams#spanbuf.cons)
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### 31.9.3 Class template basic_spanbuf [[spanbuf]](spanbuf#cons)
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#### 31.9.3.2 Constructors [spanbuf.cons]
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[ð](#lib:basic_spanbuf,constructor)
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`explicit basic_spanbuf(std::span<charT> s,
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ios_base::openmode which = ios_base::in | ios_base::out);
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`
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[1](#1)
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[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iostreams.tex#L10147)
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*Effects*: Initializes the base class with basic_streambuf() ([[streambuf.cons]](streambuf.cons "31.6.3.2 Constructors")),
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and *mode* with which[.](#1.sentence-1)
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Initializes the internal pointers as if calling span(s)[.](#1.sentence-2)
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[ð](#lib:basic_spanbuf,constructor_)
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`basic_spanbuf(basic_spanbuf&& rhs);
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`
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[2](#2)
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[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iostreams.tex#L10160)
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*Effects*: Initializes the base class with std::move(rhs) and*mode* with std::move(rhs.*mode*) and*buf* with std::move(rhs.*buf*)[.](#2.sentence-1)
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The sequence pointers in *this (eback(), gptr(), egptr(),pbase(), pptr(), epptr())
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obtain the values which rhs had[.](#2.sentence-2)
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It isimplementation-defined
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whether rhs.*buf*.empty() returns true after the move[.](#2.sentence-3)
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[3](#3)
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[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/iostreams.tex#L10173)
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*Postconditions*: Let rhs_p refer to the state of rhs just prior to this construction[.](#3.sentence-1)
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- [(3.1)](#3.1)
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span().data() == rhs_p.span().data()
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- [(3.2)](#3.2)
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span().size() == rhs_p.span().size()
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- [(3.3)](#3.3)
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eback() == rhs_p.eback()
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- [(3.4)](#3.4)
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gptr() == rhs_p.gptr()
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- [(3.5)](#3.5)
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egptr() == rhs_p.egptr()
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- [(3.6)](#3.6)
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pbase() == rhs_p.pbase()
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- [(3.7)](#3.7)
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pptr() == rhs_p.pptr()
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- [(3.8)](#3.8)
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epptr() == rhs_p.epptr()
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- [(3.9)](#3.9)
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getloc() == rhs_p.getloc()
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