std::istream_iterator::istream_iterator

 

C++

Language

Standard library headers

Concepts

Utilities library

Strings library

Containers library

Algorithms library

Iterators library

Numerics library

Input/output library

Localizations library

Regular expressions library (C++11)

Atomic operations library (C++11)

Thread support library (C++11)

Filesystem library (C++17)

Technical Specifications

 

Iterator library

Iterator primitives
iterator_traits
input_iterator_tagoutput_iterator_tagforward_iterator_tagbidirectional_iterator_tagrandom_access_iterator_tag
iterator
Iterator adaptors
reverse_iterator move_iterator (C++11) back_insert_iterator front_insert_iterator insert_iterator	make_reverse_iterator (C++14) make_move_iterator (C++11) back_inserter front_inserter inserter
Stream iterators
istream_iterator
ostream_iterator
istreambuf_iterator
ostreambuf_iterator
Iterator operations
advance
distance
prev (C++11)
next (C++11)
Range access
begincbegin (C++11)(C++14)
endcend (C++11)(C++14)
rbegincrbegin (C++14)(C++14)
rendcrend (C++14)(C++14)
Container access
size (C++17)
empty (C++17)
data (C++17)

 

std::istream_iterator

Member functions

istream_iterator::istream_iterator

istream_iterator::~istream_iterator

istream_iterator::operator*istream_iterator::operator->

istream_iterator::operator++istream_iterator::operator++(int)

Non-member functions

operator==operator!=

 

/*see below*/ 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 T is a literal type.	(since C++11) (until C++17)
This constructor is constexpr if std::is_trivially_default_constructible_v<T> is true,	(since C++17)

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 T is a literal type, this copy constructor is a trivial copy constructor.	(since C++11) (until C++17)
If std::is_trivially_copy_constructible_v<T> is true, this copy constructor is a trivial copy constructor.	(since C++17)

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