std::unique_ptr<T,Deleter>::operator[] - cppreference.com (original) (raw)

| | | (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.

[edit] Parameters

[edit] Return value

Returns the element at index i, i.e. get()[i].

[edit] Example

#include #include   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

[edit] See also

| | returns a pointer to the managed object (public member function) [edit] | | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |