std::ranges::concat_view<Views...>:: begin
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concat_view::begin
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| Deduction guides | ||||
| Iterator | ||||
| Member functions | ||||
| Non-member functions | ||||
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constexpr
/*iterator*/
<
false
>
begin
(
)
requires ( ! ( /*simple-view*/ < Views > && ... ) ) ; |
(1) | (since C++26) |
|
constexpr
/*iterator*/
<
true
>
begin
(
)
const
requires
(
ranges::
range
<
const
Views
>
&&
...
)
&&
|
(2) | (since C++26) |
Returns an
iterator
to the beginning of the
concat_view
.
iterator
<
false
>
it
(
this,
std::
in_place_index
<
0
>
,
ranges::
begin
(
std
::
get
<
0
>
(
views_
)
)
)
;
it. template
satisfy
<
0
>
(
)
;
return it ; .
iterator
<
true
>
it
(
this,
std::
in_place_index
<
0
>
,
ranges::
begin
(
std
::
get
<
0
>
(
views_
)
)
)
;
it. template
satisfy
<
0
>
(
)
;
return it ; .
Return value
As specified above.
Example
The preliminary version can be checked out on Compiler Explorer .
#include <ranges> #include <string_view> using namespace std::literals; int main() { static constexpr auto c = {"🐱", "🐶"}; static constexpr auto a = {"🤡"sv}; static constexpr auto t = {"💚"sv}; static constexpr auto cat{std::views::concat(c, a, t)}; static_assert(*cat.begin() == "\U0001F431" and cat.begin()[1] == "🐶" and *(cat.begin() + 2) == "\N{CLOWN FACE}"); }
See also
|
returns an iterator or a sentinel to the end
(public member function) |
|
|
(C++20)
|
returns an iterator to the beginning of a range
(customization point object) |