std::experimental::ostream_joiner<DelimT,CharT,Traits>::operator=
From cppreference.com
< cpp | experimental | ostream joiner
C++
Feature test macros (C++20)
Concepts library (C++20)
Metaprogramming library (C++11)
Ranges library (C++20)
Filesystem library (C++17)
Concurrency support library (C++11)
Execution control library (C++26)
Experimental
Filesystem library (filesystem TS)
Library fundamentals (library fundamentals TS)
Library fundamentals 2 (library fundamentals TS v2)
Library fundamentals 3 (library fundamentals TS v3)
Extensions for parallelism (parallelism TS)
Extensions for parallelism 2 (parallelism TS v2)
Extensions for concurrency (concurrency TS)
Extensions for concurrency 2 (concurrency TS v2)
Concepts (concepts TS)
Ranges (ranges TS)
Reflection (reflection TS)
Mathematical special functions (special functions TR)
std::experimental::ostream_joiner
Member functions
ostream_joiner::operator=
Non-member functions
template< class T >
ostream_joiner& operator=( const T& value );
(1)
(library fundamentals TS v2)
ostream_joiner& operator=( const T& value );
ostream_joiner& operator=( const ostream_joiner& other ) = default;
(2)
(library fundamentals TS v2) (implicitly declared)
ostream_joiner& operator=( ostream_joiner&& other ) = default;
(3)
(library fundamentals TS v2) (implicitly declared)
1) First, if the private "first element" flag is false, insert the delimiter
delim into the output stream os associated with this iterator as if by os << delim;. Then, unconditionally sets the "first element" flag to false, and insert value into the output stream as if by os << value;.
Let
out_stream, delim, and first_element denote the private stream pointer, delimiter, and "first element" flag members respectively. Then this function is equivalent to
if (!first_element) *out_stream << delim; first_element = false; *out_stream << value; return *this;
2,3) Implicitly declared copy/move assignment operator that copy/move assigns the private stream pointer, delimiter, and "first element" flag members.
[edit] Parameters
value
-
the object to to be written to the stream
other
-
the
ostream_joiner object to be assigned to this object
[edit] Return value
*this.
[edit] Example
Run this code
#include <experimental/iterator> #include <iostream> int main() { auto joiner = std::experimental::make_ostream_joiner (std::cout, ", "); joiner = "First"; joiner = "do no harm."; // prefixes with the delimiter }
Output:
First, do no harm.