31 Input/output library [input.output]

31.7 Formatting and manipulators [iostream.format]

31.7.5 Input streams [input.streams]

31.7.5.3 Formatted input functions [istream.formatted]

31.7.5.3.3 basic_istream​::​operator>> [istream.extractors]

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basic_istream& operator>>(basic_istream& (*pf)(basic_istream&));
1
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Effects: None.
This extractor does not behave as a formatted input function (as described in [istream.formatted.reqmts]).
2
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Returns: pf(*this).
278
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basic_istream& operator>>(basic_ios<charT, traits>& (*pf)(basic_ios<charT, traits>&));
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Effects: Calls pf(*this).
This extractor does not behave as a formatted input function (as described in [istream.formatted.reqmts]).
4
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Returns: *this.
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basic_istream& operator>>(ios_base& (*pf)(ios_base&));
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Effects: Calls pf(*this).279
This extractor does not behave as a formatted input function (as described in [istream.formatted.reqmts]).
6
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Returns: *this.
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template<class charT, class traits, size_t N> basic_istream<charT, traits>& operator>>(basic_istream<charT, traits>& in, charT (&s)[N]); template<class traits, size_t N> basic_istream<char, traits>& operator>>(basic_istream<char, traits>& in, unsigned char (&s)[N]); template<class traits, size_t N> basic_istream<char, traits>& operator>>(basic_istream<char, traits>& in, signed char (&s)[N]);
7
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Effects: Behaves like a formatted input member (as described in [istream.formatted.reqmts]) of in.
After a sentry object is constructed, operator>> extracts characters and stores them into s.
If width() is greater than zero, n is min(size_t(width()), N).
Otherwise n is N.
n is the maximum number of characters stored.
8
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Characters are extracted and stored until any of the following occurs:
  • (8.1)
    n-1 characters are stored;
  • (8.2)
    end of file occurs on the input sequence;
  • (8.3)
    letting ct be use_facet<ctype<charT>>(in.getloc()), ct.is(ct.space, c) is true.
9
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operator>> then stores a null byte (charT()) in the next position, which may be the first position if no characters were extracted.
operator>> then calls width(0).
10
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If the function extracted no characters, ios_base​::​failbit is set in the input function's local error state before setstate is called.
11
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Returns: in.
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template<class charT, class traits> basic_istream<charT, traits>& operator>>(basic_istream<charT, traits>& in, charT& c); template<class traits> basic_istream<char, traits>& operator>>(basic_istream<char, traits>& in, unsigned char& c); template<class traits> basic_istream<char, traits>& operator>>(basic_istream<char, traits>& in, signed char& c);
12
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Effects: Behaves like a formatted input member (as described in [istream.formatted.reqmts]) of in.
A character is extracted from in, if one is available, and stored in c.
Otherwise, ios_base​::​failbit is set in the input function's local error state before setstate is called.
13
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Returns: in.
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basic_istream& operator>>(basic_streambuf<charT, traits>* sb);
14
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Effects: Behaves as an unformatted input function.
If sb is null, calls setstate(failbit), which may throw ios_base​::​failure ([iostate.flags]).
After a sentry object is constructed, extracts characters from *this and inserts them in the output sequence controlled by sb.
Characters are extracted and inserted until any of the following occurs:
  • (14.1)
    end-of-file occurs on the input sequence;
  • (14.2)
    inserting in the output sequence fails (in which case the character to be inserted is not extracted);
  • (14.3)
    an exception occurs (in which case the exception is caught).
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If the function inserts no characters, ios_base​::​failbit is set in the input function's local error state before setstate is called.
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Returns: *this.
278)278)
See, for example, the function signature ws(basic_istream&) ([istream.manip]).
279)279)
See, for example, the function signature dec(ios_base&) ([basefield.manip]).