# std::istream_iterator::istream_iterator

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< cpp‎ | iterator‎ | istream iterator

constexpr istream_iterator(); | (1) |
istream_iterator( istream_type& stream ); | (2) |
istream_iterator( const istream_iterator& other ) = default; | (3) |

1) Constructs the end-of-stream iterator. This constructor is constexpr if std::is_trivially_default_constructible_v<T> is `true` .
2) Initializes the iterator and stores the address of `stream` in a data member. Optionally, performs the first read from the input stream to initialize the cached value data member (although it may be delayed until the first access)
3) Constructs a copy of `other`. If std::is_trivially_copy_constructible_v<T> is `true` , this copy constructor is a trivial copy constructor.

### Parameters

stream | - | stream to initialize the istream_iterator with
other | - | another istream_iterator of the same type

### Examples

Run this code

    #include <iostream>
    #include <iterator>
    #include <algorithm>
    #include <sstream>
    int main()
    {
        std::istringstream stream("1 2 3 4 5");
        std::copy(
            std::istream_iterator<int>(stream),
            std::istream_iterator<int>(),
            std::ostream_iterator<int>(std::cout, " ")
        );
    }

Output:

    1 2 3 4 5

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