Movatterモバイル変換


[0]ホーム

URL:


cppreference.com
Namespaces
Variants
    Actions

      std::basic_string<CharT,Traits,Allocator>::begin,std::basic_string<CharT,Traits,Allocator>::cbegin

      From cppreference.com
      <cpp‎ |string‎ |basic string
       
       
       
      std::basic_string
       
      iterator begin();
      (1)(noexcept since C++11)
      (constexpr since C++20)
      const_iterator begin()const;
      (2)(noexcept since C++11)
      (constexpr since C++20)
      const_iterator cbegin()constnoexcept;
      (3)(since C++11)
      (constexpr since C++20)

      Returns an iterator to the first character of the string.

      begin() returns amutable orconstant iterator, depending on the constness of*this.

      cbegin() always returns aconstant iterator. It is equivalent toconst_cast<const basic_string&>(*this).begin().

      range-begin-end.svg

      Contents

      [edit]Parameters

      (none)

      [edit]Return value

      Iterator to the first character.

      [edit]Complexity

      Constant.

      [edit]Notes

      libc++ backportscbegin() to C++98 mode.

      [edit]Example

      Run this code
      #include <iostream>#include <string> int main(){std::string s("Exemplar");*s.begin()='e';std::cout<< s<<'\n'; auto i= s.cbegin();std::cout<<*i<<'\n';//  *i = 'E'; // error: i is a constant iterator}

      Output:

      exemplare

      [edit]See also

      (C++11)
      returns an iterator to the end
      (public member function)[edit]
      returns an iterator to the beginning
      (public member function ofstd::basic_string_view<CharT,Traits>)[edit]
      Retrieved from "https://en.cppreference.com/mwiki/index.php?title=cpp/string/basic_string/begin&oldid=172766"

      [8]ページ先頭

      ©2009-2025 Movatter.jp