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/C++std::ranges::subrange<I,S,K>::begin
constexpr I begin() const requires std::copyable<I>; | (1) | (since C++20) |
[[nodiscard]] constexpr I begin() requires (!std::copyable<I>); | (2) | (since C++20) |
Obtains the iterator to the first element of the subrange, or the end iterator if the view is empty.
1) Returns a copy of the stored iterator if the iterator type is copyable.
2) Returns an iterator move-constructed from the stored iterator if the iterator type is not copyable.
Parameters
(none).
Return value
1) An iterator copy-constructed from the stored iterator.
2) An iterator move-constructed from the stored iterator.
Notes
A call to (2) may leave the stored iterator in a valid but unspecified state, depending on the behavior of the move constructor of I.
Example
See also
|
(C++20) | obtains the sentinel (public member function) |
|
(C++11)(C++14) | returns an iterator to the beginning of a container or array (function template) |
|
(C++20) | returns an iterator to the beginning of a range (customization point object) |
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