29 Input/output library [input.output]

29.7 Formatting and manipulators [iostream.format]

29.7.4 Input streams [input.streams]

29.7.4.3 Formatted input functions [istream.formatted]

29.7.4.3.2 Arithmetic extractors [istream.formatted.arithmetic]

operator>>(unsigned short& val);
operator>>(unsigned int& val);
operator>>(long& val);
operator>>(unsigned long& val);
operator>>(long long& val);
operator>>(unsigned long long& val);
operator>>(float& val);
operator>>(double& val);
operator>>(long double& val);
operator>>(bool& val);
operator>>(void*& val);

As in the case of the inserters, these extractors depend on the locale's num_get<> object to perform parsing the input stream data.

These extractors behave as formatted input functions (as described in [istream.formatted.reqmts]).

After a sentry object is constructed, the conversion occurs as if performed by the following code fragment: using numget = num_get<charT, istreambuf_iterator<charT, traits>>; iostate err = iostate::goodbit; use_facet<numget>(loc).get(*this, 0, *this, err, val); setstate(err);

In the above fragment, loc stands for the private member of the basic_ios class.

[Note 1:

The first argument provides an object of the istreambuf_iterator class which is an iterator pointed to an input stream.

It bypasses istreams and uses streambufs directly.

— end note]

Class locale relies on this type as its interface to istream, so that it does not need to depend directly on istream.

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operator>>(short& val);

The conversion occurs as if performed by the following code fragment (using the same notation as for the preceding code fragment): using numget = num_get<charT, istreambuf_iterator<charT, traits>>; iostate err = ios_base::goodbit; long lval; use_facet<numget>(loc).get(*this, 0, *this, err, lval); if (lval < numeric_limits<short>::min()) { err |= ios_base::failbit; val = numeric_limits<short>::min(); } else if (numeric_limits<short>::max() < lval) { err |= ios_base::failbit; val = numeric_limits<short>::max(); } else val = static_cast<short>(lval); setstate(err);

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operator>>(int& val);

The conversion occurs as if performed by the following code fragment (using the same notation as for the preceding code fragment): using numget = num_get<charT, istreambuf_iterator<charT, traits>>; iostate err = ios_base::goodbit; long lval; use_facet<numget>(loc).get(*this, 0, *this, err, lval); if (lval < numeric_limits<int>::min()) { err |= ios_base::failbit; val = numeric_limits<int>::min(); } else if (numeric_limits<int>::max() < lval) { err |= ios_base::failbit; val = numeric_limits<int>::max(); } else val = static_cast<int>(lval); setstate(err);