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std::ostream_iterator<T,CharT,Traits>::ostream_iterator

From cppreference.com
 
 
Iterator library
Iterator concepts
Iterator primitives
Algorithm concepts and utilities
Indirect callable concepts
Common algorithm requirements
Utilities
(C++20)
Iterator adaptors
Stream iterators
Iterator customization points
Iterator operations
(C++11)
(C++11)
Range access
(C++11)(C++14)
(C++11)(C++14)
(C++17)(C++20)
(C++14)(C++14)
(C++14)(C++14)
(C++17)
(C++17)
 
 
ostream_iterator( ostream_type& stream, const CharT* delim );
(1)
ostream_iterator( ostream_type& stream );
(2)
1) Constructs the iterator with stream as the associated stream and delim as the delimiter.
2) Constructs the iterator with stream as the associated stream and a null pointer as the delimiter.

[edit] Parameters

stream - the output stream to be accessed by this iterator
delim - the null-terminated character string to be inserted into the stream after each output

[edit] Example

#include <iostream>
#include <iterator>
#include <algorithm>
#include <numeric>
int main()
{
    std::ostream_iterator<char> oo {std::cout};
    std::ostream_iterator<int> i1 {std::cout, ", "};
    std::fill_n(i1, 5, -1);
    *oo++ = '\n';
 
    std::ostream_iterator<double> i2 {std::cout, "; "};
    *i2++ = 3.14;
    *i2++ = 2.71;
    *oo++ = '\n';
 
    std::common_iterator<std::counted_iterator<std::ostream_iterator<float>>,
                         std::default_sentinel_t>
        first { std::counted_iterator{std::ostream_iterator<float>{std::cout," ~ "}, 5} },
        last { std::default_sentinel };
    std::iota(first, last, 2.2);
    *oo++ = '\n';
}

Output:

-1, -1, -1, -1, -1,
3.14; 2.71;
2.2 ~ 3.2 ~ 4.2 ~ 5.2 ~ 6.2 ~

[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
P2325R3 C++20 default constructor was provided as C++20 iterators
must be default_initializable
removed along with the requirement