std::unique_ptr<T,Deleter>::operator[]
From cppreference.com
< cpp | memory | unique ptr
T& operator[]( std::size_t i ) const; |
(since C++11) (constexpr since C++23) |
|
operator[]
provides access to elements of an array managed by a unique_ptr
.
The parameter i shall be less than the number of elements in the array; otherwise, the behavior is undefined.
This member function is only provided for specializations for array types.
Parameters
i | - | the index of the element to be returned |
Return value
Returns the element at index i, i.e. get()[i]
.
Example
Run this code
#include <iostream> #include <memory> int main() { const int size = 10; std::unique_ptr<int[]> fact(new int[size]); for (int i = 0; i < size; ++i) fact[i] = (i == 0) ? 1 : i * fact[i - 1]; for (int i = 0; i < size; ++i) std::cout << i << "! = " << fact[i] << '\n'; }
Output:
0! = 1 1! = 1 2! = 2 3! = 6 4! = 24 5! = 120 6! = 720 7! = 5040 8! = 40320 9! = 362880
See also
returns a pointer to the managed object (public member function) |