reference operator[]( size_type pos ); | ||
const_reference operator[]( size_type pos ) const; |
Returns a reference to the element at specified location pos
. No bounds checking is performed.
pos | - | position of the element to return |
Reference to the requested element.
Constant.
Unlike std::map::operator[]
, this operator never inserts a new element into the container.
The following code uses operator[]
to read from and write to a std::vector<int>
:
#include <vector> #include <iostream> int main() { std::vector<int> numbers {2, 4, 6, 8}; std::cout << "Second element: " << numbers[1] << '\n'; numbers[0] = 5; std::cout << "All numbers:"; for (auto i : numbers) { std::cout << ' ' << i; } std::cout << '\n'; }
Output:
Second element: 4 All numbers: 5 4 6 8
access specified element with bounds checking (public member function) |
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