std::istream_iterator<T,CharT,Traits,Distance>::operator++, operator++(int)

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istream_iterator& operator++();
istream_iterator operator++( int );

Reads a value from the underlying stream (using its operator>>) and stores it into the iterator object. If the read fails (the underlying stream's fail() returns true), the iterator becomes the end-of-stream iterator.

The behavior is undefined if the iterator is end-of-stream iterator.


[edit] Parameters


[edit] Return value

1) *this
2) An istream_iterator that holds an unchanged value.

[edit] Exceptions

May throw implementation-defined exceptions.

[edit] Defect reports

The following behavior-changing defect reports were applied retroactively to previously published C++ standards.

DR Applied to Behavior as published Correct behavior
LWG 260 C++98 the return type of operator++(int) was istream_iterator& corrected to istream_iterator
LWG 788 C++98 the underlying stream's operator void* was
used to determine whether the read fails, but it
was removed by the resolution of LWG issue 468
uses fail() instead
LWG 838 C++98 it was unclear whether end-of-stream iterators can be incremented the behavior is undefined