[#bsl-basic_string-0f3-operator_subs-0c]
= xref:bsl.adoc[bsl]::xref:bsl/basic_string-0f3.adoc[basic_string<char32_t>]::operator[]
:relfileprefix: ../../
:mrdocs:

Return a reference providing non‐modifiable access to the character at the specified `position` in this string. The behavior is undefined unless `position <= length()`. Note that if `position == length()`, a reference to the null‐terminating character is returned.

== Synopsis

Declared in `<bslstl_string.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:bsl/basic_string-0f3/const_reference.adoc[const_reference]
operator[](xref:bsl/basic_string-0f3/size_type.adoc[size_type] position) const;
----


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