std::shared_ptr<T>::operator[]
Declarations
element_type& operator[]( std::ptrdiff_t idx ) const;
Index into the array pointed to by the stored pointer.
The behavior is undefined if the stored pointer is null
or if idx
is negative.
If T
(the template parameter of shared_ptr
) is an array type U[N]
, idx must be less than N
, otherwise the behavior is undefined.
Parameters
idx
- the array index
Return value
A reference to the idx
-th element of the array, i.e., get()[idx]
Exceptions
Throws nothing.
Remarks
When T
is not an array type, it is unspecified whether this function is declared. If the function is declared, it is unspecified what its return type is,
except that the declaration (although not necessarily the definition) of the function is guaranteed to be legal.
Example
#include <cstddef>
#include <memory>
#include <iostream>
int main() {
const std::size_t arr_size = 10;
std::shared_ptr<int[]>
pis(new int[10]{0,1,2,3,4,5,6,7,8,9});
for (std::size_t i = 0; i < arr_size; i++){
std::cout << pis[i] << ' ';
}
}
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