[#bsl-shared_ptr-0a-operator_subs]
= xref:bsl.adoc[bsl]::xref:bsl/shared_ptr-0a.adoc[shared_ptr]::operator[]
:relfileprefix: ../../
:mrdocs:

Return a reference providing modifiable access to the object at the specified `index` offset in the object referred to by this shared pointer. The behavior is undefined unless this shared pointer is not empty, `ELEMENT_TYPE` is not `void` (a compiler error will be generated if this operator is instantiated within the `shared_ptr<void>` class), and this shared pointer refers to an array of `ELEMENT_TYPE` objects. Instead of `element_type &`, we use `add_lvalue_reference<element_type>::type` for the return type because that allows people to instantiate `shared_ptr<cv_void>`, as long as they don't use this method. Note that this method is logically equivalent to `*(get() + index)`.

== Synopsis

Declared in `<bslstl_sharedptr.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
add_lvalue_reference<element_type>::type
operator[](ptrdiff_t index) const;
----


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