From cppreference.com
T&operator[](std::size_ti)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.
.
Example
Run this code
#include<iostream>#include<memory>intmain(){constintsize=10;std::unique_ptr<int[]>fact(newint[size]);for(inti=0;i<size;++i)fact[i]=(i==0)?1:i*fact[i-1];for(inti=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)