tmp/tmp3_9_cgng/{from.md → to.md}
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| 1 |
+
##### `basic_istream::operator>>` <a id="istream.extractors">[[istream.extractors]]</a>
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| 2 |
+
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| 3 |
+
``` cpp
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| 4 |
+
basic_istream<charT, traits>&
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| 5 |
+
operator>>(basic_istream<charT, traits>& (*pf)(basic_istream<charT, traits>&));
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| 6 |
+
```
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| 7 |
+
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*Effects:* None. This extractor does not behave as a formatted input
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| 9 |
+
function (as described in [[istream.formatted.reqmts]]).
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| 10 |
+
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+
*Returns:* `pf(*this)`.[^21]
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+
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| 13 |
+
``` cpp
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+
basic_istream<charT, traits>&
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| 15 |
+
operator>>(basic_ios<charT, traits>& (*pf)(basic_ios<charT, traits>&));
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```
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+
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+
*Effects:* Calls `pf(*this)`. This extractor does not behave as a
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| 19 |
+
formatted input function (as described
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| 20 |
+
in [[istream.formatted.reqmts]]).
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| 21 |
+
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| 22 |
+
*Returns:* `*this`.
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| 23 |
+
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| 24 |
+
``` cpp
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+
basic_istream<charT, traits>& operator>>(ios_base& (*pf)(ios_base&));
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| 26 |
+
```
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| 27 |
+
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| 28 |
+
*Effects:* Calls `pf(*this)`.[^22] This extractor does not behave as a
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| 29 |
+
formatted input function (as described
|
| 30 |
+
in [[istream.formatted.reqmts]]).
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| 31 |
+
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| 32 |
+
*Returns:* `*this`.
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| 33 |
+
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| 34 |
+
``` cpp
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+
template<class charT, class traits>
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+
basic_istream<charT, traits>& operator>>(basic_istream<charT, traits>& in, charT* s);
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| 37 |
+
template<class traits>
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| 38 |
+
basic_istream<char, traits>& operator>>(basic_istream<char, traits>& in, unsigned char* s);
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| 39 |
+
template<class traits>
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| 40 |
+
basic_istream<char, traits>& operator>>(basic_istream<char, traits>& in, signed char* s);
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| 41 |
+
```
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| 42 |
+
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| 43 |
+
*Effects:* Behaves like a formatted input member (as described
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| 44 |
+
in [[istream.formatted.reqmts]]) of `in`. After a `sentry` object is
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| 45 |
+
constructed, `operator>>` extracts characters and stores them into
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| 46 |
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successive locations of an array whose first element is designated by
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| 47 |
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`s`. If `width()` is greater than zero, `n` is `width()`. Otherwise `n`
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| 48 |
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is the number of elements of the largest array of `char_type` that can
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| 49 |
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store a terminating `charT()`. `n` is the maximum number of characters
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| 50 |
+
stored.
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| 51 |
+
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| 52 |
+
Characters are extracted and stored until any of the following occurs:
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| 53 |
+
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| 54 |
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- `n-1` characters are stored;
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| 55 |
+
- end of file occurs on the input sequence;
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| 56 |
+
- letting `ct` be `use_facet<ctype<charT>>(in.getloc())`,
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| 57 |
+
`ct.is(ct.space, c)` is `true`.
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| 58 |
+
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| 59 |
+
`operator>>` then stores a null byte (`charT()`) in the next position,
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| 60 |
+
which may be the first position if no characters were extracted.
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| 61 |
+
`operator>>` then calls `width(0)`.
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| 62 |
+
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| 63 |
+
If the function extracted no characters, it calls `setstate(failbit)`,
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| 64 |
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which may throw `ios_base::failure` ([[iostate.flags]]).
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+
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*Returns:* `in`.
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| 67 |
+
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| 68 |
+
``` cpp
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| 69 |
+
template<class charT, class traits>
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+
basic_istream<charT, traits>& operator>>(basic_istream<charT, traits>& in, charT& c);
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| 71 |
+
template<class traits>
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| 72 |
+
basic_istream<char, traits>& operator>>(basic_istream<char, traits>& in, unsigned char& c);
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| 73 |
+
template<class traits>
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| 74 |
+
basic_istream<char, traits>& operator>>(basic_istream<char, traits>& in, signed char& c);
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| 75 |
+
```
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| 76 |
+
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| 77 |
+
*Effects:* Behaves like a formatted input member (as described
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| 78 |
+
in [[istream.formatted.reqmts]]) of `in`. After a `sentry` object is
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| 79 |
+
constructed a character is extracted from `in`, if one is available, and
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| 80 |
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stored in `c`. Otherwise, the function calls `in.setstate(failbit)`.
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| 81 |
+
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| 82 |
+
*Returns:* `in`.
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| 83 |
+
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| 84 |
+
``` cpp
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| 85 |
+
basic_istream<charT, traits>& operator>>(basic_streambuf<charT, traits>* sb);
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| 86 |
+
```
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| 87 |
+
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| 88 |
+
*Effects:* Behaves as an unformatted input function
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| 89 |
+
([[istream.unformatted]]). If `sb` is null, calls `setstate(failbit)`,
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| 90 |
+
which may throw `ios_base::failure` ([[iostate.flags]]). After a sentry
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| 91 |
+
object is constructed, extracts characters from `*this` and inserts them
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| 92 |
+
in the output sequence controlled by `sb`. Characters are extracted and
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| 93 |
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inserted until any of the following occurs:
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| 94 |
+
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| 95 |
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- end-of-file occurs on the input sequence;
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| 96 |
+
- inserting in the output sequence fails (in which case the character to
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| 97 |
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be inserted is not extracted);
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| 98 |
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- an exception occurs (in which case the exception is caught).
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| 99 |
+
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| 100 |
+
If the function inserts no characters, it calls `setstate(failbit)`,
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| 101 |
+
which may throw `ios_base::failure` ([[iostate.flags]]). If it inserted
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| 102 |
+
no characters because it caught an exception thrown while extracting
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| 103 |
+
characters from `*this` and `failbit` is on in
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| 104 |
+
`exceptions()` ([[iostate.flags]]), then the caught exception is
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| 105 |
+
rethrown.
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| 106 |
+
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| 107 |
+
*Returns:* `*this`.
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| 108 |
+
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