std::ranges::subrange<I,S,K>:: next
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C++
Ranges library
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Range primitives | |||||||
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Range concepts | |||||||||||||||||||
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Range factories | |||||||||
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std::ranges::subrange
constexpr
subrange next
(
std::
iter_difference_t
<
I
>
n
=
1
)
const
&
requires std:: forward_iterator < I > ; |
(1) | (since C++20) |
constexpr
subrange next
(
std::
iter_difference_t
<
I
>
n
=
1
)
&&
;
|
(2) | (since C++20) |
Returns a
subrange
whose
begin_
is incremented (or decremented if
n
is negative). The actual increment (or decrement) operation is performed by
advance()
.
1)
Returns a copy of
*
this
. Equivalent to:
auto
tmp
=
*
this
;
tmp. advance ( n ) ;
return tmp ; .
tmp. advance ( n ) ;
return tmp ; .
2)
Returns a
subrange
moved from
*
this
. Equivalent to:
advance
(
n
)
;
return std :: move ( * this ) ; .
return std :: move ( * this ) ; .
Parameter
n | - | number of maximal increments of the iterator |
Return value
As described above.
Notes
The difference between this function and
advance()
is that the latter performs the increment (or decrement) in place.
Example
Run this code
#include <array> #include <iterator> #include <print> #include <ranges> int main() { std::array arr{1, 2, 3, 4, 5, 6, 7}; std::ranges::subrange sub{std::next(arr.begin(), 2), std::prev(arr.end(), 2)}; std::println("1) sub: {}", sub); std::println("2) sub: {}", sub.next()); std::println("3) sub: {}", sub.next(2)); }
Output:
1) sub: [3, 4, 5] 2) sub: [4, 5] 3) sub: [5]
See also
obtains a copy of the
subrange
with its iterator decremented by a given distance
(public member function) |
|
advances the iterator by given distance
(public member function) |
|
(C++11)
|
increment an iterator
(function template) |
(C++20)
|
increment an iterator by a given distance or to a bound
(algorithm function object) |
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