std::ranges::drop_view<V>::reserve_hint
constexpr auto reserve_hint()
requires ranges::approximately_sized_range<V>
| (1) | (since C++26) |
constexpr auto reserve_hint() const
requires ranges::approximately_sized_range<const V>
| (2) | (since C++26) |
Let W be V for overload (1) or constV for overload (2). Equivalent to
constautos=static_cast<ranges::range_difference_t<W>>(ranges::reserve_hint(base_));
return to-unsigned-like(s< count_ ?0:s- count_);
Return value
The approximate size of the resulting range.
Notes
| Feature-test macro | Value | Std | Feature |
|---|---|---|---|
__cpp_lib_ranges_reserve_hint | 202502L | (C++26) |
ranges::approximately_sized_range and reserve_hint (1,2) |
Example
See also
returns the number of elements, provided only if the underlying (adapted) range satisfies sized_range (public member function) |
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