iter_move(std::common_iterator)
friend std::iter_rvalue_reference_t<I>
iter_move( const std::common_iterator& i )
noexcept(noexcept(ranges::iter_move(std::declval<const I&>()))
requires std::input_iterator<I>; |
(since C++20) |
Casts the result of dereferencing the underlying iterator to its associated rvalue reference type. The behavior is undefined if i.var does not hold an I object (i.e. an iterator).
The function body is equivalent to: return std::ranges::iter_move(std::get<I>(i.var));.
This function is not visible to ordinary unqualified or qualified lookup, and can only be found by argument-dependent lookup when std::common_iterator<I,S> is an associated class of the arguments.
Parameters
| i | - | a source iterator adaptor. |
Return value
An rvalue reference or a prvalue temporary.
Complexity
Constant.
Example
#include <iomanip>
#include <iostream>
#include <iterator>
#include <string>
#include <vector>
void print(auto const& rem, auto const& v) {
std::cout << rem << "[" << size(v) << "] { ";
for (int o{}; auto const& s : v)
std::cout << (o++ == 0 ? "" : ", ") << quoted(s);
std::cout << " }\n";
}
int main()
{
std::vector<std::string> p { "Andromeda", "Cassiopeia", "Phoenix" }, q;
print("p", p), print("q", q);
using CI = std::common_iterator<
std::counted_iterator<std::vector<std::string>::iterator>,
std::default_sentinel_t
>;
CI last{ std::default_sentinel };
for (CI first{ {p.begin(), 2} }; first != last; ++first) {
q.emplace_back( /* ADL */ iter_move(first) );
}
print("p", p), print("q", q);
}
Possible output:
p[3] { "Andromeda", "Cassiopeia", "Phoenix" }
q[0] { }
p[3] { "", "", "Phoenix" }
q[2] { "Andromeda", "Cassiopeia" }
See also
|
(C++20)
|
casts the result of dereferencing an object to its associated rvalue reference type (customization point object) |
|
(C++20)
|
casts the result of dereferencing the underlying iterator to its associated rvalue reference type (function) |
|
(C++11)
|
obtains an rvalue reference (function template) |
|
(C++11)
|
obtains an rvalue reference if the move constructor does not throw (function template) |
|
(C++11)
|
forwards a function argument (function template) |
|
(C++20)
|
moves a range of elements to a new location (niebloid) |
|
(C++20)
|
moves a range of elements to a new location in backwards order (niebloid) |
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https://en.cppreference.com/w/cpp/iterator/common_iterator/iter_move
