std::ostream_iterator<T,CharT,Traits>::ostream_iterator
From cppreference.com
< cpp | iterator | ostream iterator
ostream_iterator( ostream_type& stream, const CharT* delim ); |
(1) | |
ostream_iterator( ostream_type& stream ); |
(2) | |
Constructs the iterator with stream as the associated stream, by storing the address of stream.
1) Uses delim as the delimiter.
2) Uses a null pointer as the delimiter.
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 |
Example
Run this code
#include <algorithm> #include <iostream> #include <iterator> #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 ~
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 1280 | C++98 | stream was stored directly | stores its address instead |
P2325R3 | C++20 | default constructor was provided as C++20 iterators must be default_initializable
|
removed along with the requirement |