std::vector<T,Allocator>::begin,std::vector<T,Allocator>::cbegin (3) - Linux Man Pages

std::vector<T,Allocator>::begin,std::vector<T,Allocator>::cbegin: std::vector<T,Allocator>::begin,std::vector<T,Allocator>::cbegin


std::vector<T,Allocator>::begin,std::vector<T,Allocator>::cbegin - std::vector<T,Allocator>::begin,std::vector<T,Allocator>::cbegin


iterator begin(); (until C++11)
iterator begin() noexcept; (since C++11)
const_iterator begin() const; (until C++11)
const_iterator begin() const noexcept; (since C++11)
const_iterator cbegin() const noexcept; (since C++11)

Returns an iterator to the first element of the container.
If the container is empty, the returned iterator will be equal to end().



Return value

Iterator to the first element




// Run this code

  #include <iostream>
  #include <vector>
  #include <string>

  int main()
   std::vector<int> ints {1, 2, 4, 8, 16};

   std::vector<std::string> fruits {"orange", "apple", "raspberry"};

   std::vector<char> empty;

   // Sums all integers in the vector ints (if any), printing only the result.

   int sum = 0;

   for (auto it = ints.cbegin(); it != ints.cend(); it++)

   sum += *it;

   std::cout << "Sum of ints: " << sum << "\n";

   // Prints the first fruit in the vector fruits, without checking if there is one.

   std::cout << "First fruit: " << *fruits.begin() << "\n";

   if (empty.begin() == empty.end())

   std::cout << "vector 'empty' is indeed empty.\n";



  Sum of ints: 31
  First fruit: orange
  vector 'empty' is indeed empty.

See also

end_ returns an iterator to the end
cend (public member function)