constexpr auto operator[]( difference_type n ) const
requires ranges::random_access_range<Base>;
| (since C++23) |
Returns an element at specified relative location.
Let current_ be an underlying array of iterators.
Equivalent to:
return __tuple_transform([&](auto& i) -> decltype(auto) { return i[n]; }, current_);| n | - | position relative to current location |
the element at displacement n relative to the current location.
A link to test: Compiler Explorer/g++-13.
#include <ranges>
#include <tuple>
int main()
{
constexpr static auto v = {0, 1, 2, 3, 4, 5};
// └──┬──┘
// └─────────────────┐
constexpr auto view = v | std::views::adjacent<3>; // │
// ┌───────────────────┬──────────────┘
// │ ┌──┴──┐
static_assert(view[2] == std::tuple{2, 3, 4});
}
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