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constexpr/*iterator*/ begin(); | (since C++20) | |
Returns aniterator to the first found subrange.
In order to provide the amortized constant time complexity required by therange concept, this function caches the result within thesplit_view (by means ofcached_begin_ member) for use on subsequent calls.
Letbase_ be the underlying data member. Equivalent to:
constexpr/*iterator*/ begin(){if(!cached_begin_.has_value()) cached_begin_= this->find_next(ranges::begin(base_));return{*this,ranges::begin(base_), cached_begin_.value()};}
Contents |
Aniterator.
Amortized\(\scriptsize \mathcal{O}(1)\)O(1).
#include <iomanip>#include <iostream>#include <ranges>#include <string_view> int main(){constexprstd::string_view sentence{"Keep..moving..forward.."};constexprstd::string_view delim{".."}; std::ranges::split_view words{sentence, delim}; std::cout<<"begin(): "<<std::quoted(std::string_view{*words.begin()})<<"\nSubstrings: ";for(auto word: words)std::cout<<std::quoted(std::string_view(word))<<' '; std::ranges::split_view letters{sentence,std::string_view{""}};std::cout<<"\nbegin(): "<<std::quoted(std::string_view{*letters.begin()})<<"\nLetters: ";for(auto letter: letters)std::cout<<std::string_view(letter)<<' ';std::cout<<'\n';}
Output:
begin(): "Keep"Substrings: "Keep" "moving" "forward" ""begin(): "K"Letters: K e e p . . m o v i n g . . f o r w a r d . .
| returns an iterator or a sentinel to the end (public member function)[edit] | |
| returns an iterator to the beginning (public member function of std::ranges::lazy_split_view<V,Pattern>)[edit] | |
(C++20) | returns an iterator to the beginning of a range (customization point object)[edit] |
