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std::ranges...tor_closure(3) C++ Standard Libary std::ranges...tor_closure(3) NAME std::ranges::range_adaptor_closure - std::ranges::range_adaptor_closure Synopsis Defined in header <ranges> template< class D > requires std::is_object_v<D> && std::same_as<D, (since C++23) std::remove_cv_t<D>> class range_adaptor_closure {}; std::ranges::range_adaptor_closure is a helper class template for defining a RangeAdaptorClosureObject. Let t be the object of type T, the implementation ensures that t is a range adaptor closure object if all the requirements are met: * t is a unary function object that takes one range argument. * T has exactly one public base class ranges::range_adaptor_clo- sure<T>, and T has no base classes of type ranges::range_adaptor_closure<U> for any other type U. * T does not satisfy range. Example // Run this code #include <ranges> #include <string_view> // Define Slice as a range adaptor closure struct Slice : std::ranges::range_adaptor_closure<Slice> { std::size_t start = 0; std::size_t end = std::string_view::npos; constexpr std::string_view operator()(std::string_view sv) const { return sv.substr(start, end - start); } }; int main() { constexpr std::string_view str = "01234567"; constexpr Slice slicer{.start = 1, .end = 6}; constexpr auto sv1 = slicer(str); // use slicer as a normal func- tion object constexpr auto sv2 = str | slicer; // use slicer as a range adap- tor closure object static_assert(sv1 == "12345"); static_assert(sv2 == "12345"); // range adaptor closures can be composed constexpr auto slice_and_drop = slicer | std::views::drop_while([](char ch) { return ch != '3'; }); static_assert(std::string_view(str | slice_and_drop) == "345"); } http://cppreference.com 2024.06.10 std::ranges...tor_closure(3)
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