[#bsl-basic_string-0fb-operator_subs-06]
= xref:bsl.adoc[bsl]::xref:bsl/basic_string-0fb.adoc[basic_string<char>]::operator[]
:relfileprefix: ../../
:mrdocs:

Return a reference providing modifiable access to the character at the specified `position` in this string if `position < length()`, or a reference providing non‐modifiable access to the null‐terminating character if `position == length()`. The behavior is undefined unless `position <= length()`, and, in the case of `position == length()`, the null‐terminating character is not modified through the returned reference.

== Synopsis

Declared in `<bslstl_string.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:bsl/basic_string-0fb/reference.adoc[reference]
operator[](xref:bsl/basic_string-0fb/size_type.adoc[size_type] position);
----


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