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std::ranges...view::begin(3) C++ Standard Libary std::ranges...view::begin(3) NAME std::ranges::cartesian_product_view::begin - std::ranges::carte- sian_product_view::begin Synopsis constexpr iterator<false> begin() (1) (since C++23) requires (!__simple_view<First> || ... || !__simple_view<Vs>); constexpr iterator<true> begin() const requires (ranges::range<const First> && ... && (2) (since C++23) ranges::range<const Vs>); Returns an iterator to the first element of the cartesian_prod- uct_view. Let bases_ be the tuple of underlying views. 1) Equivalent to return /*iterator*/<false>(__tuple_trans- form(ranges::begin, bases_));. 2) Equivalent to return /*iterator*/<true>(__tuple_trans- form(ranges::begin, bases_));. Parameters (none) Return value An iterator to the first element. Example // Run this code #include <array> #include <format> #include <iostream> #include <ranges> #include <string_view> #include <tuple> using namespace std::literals; int main() { constexpr auto a = std::array{"Curiously"sv, "Recurring"sv, "Tem- plate"sv, "Pattern"sv}; constexpr auto v = std::ranges::cartesian_product_view(a[0], a[1], a[2], a[3]); constexpr std::tuple<char const&, char const&, char const&, char const&> first{*v.begin()}; std::cout << std::format("{}{}{}{}{}", std::get<0>(first), std::get<1>(first), std::get<2>(first), std::get<3>(first), '\n'); } Output: CRTP See also end returns an iterator or a sentinel to the end (C++23) (public member function) ranges::begin returns an iterator to the beginning of a range (C++20) (customization point object) http://cppreference.com 2024.06.10 std::ranges...view::begin(3)
NAME | Synopsis | Parameters | Return value | Example | Output: | See also
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