[#BloombergLP-bslstl-StringRefImp-02-operator_subs]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/bslstl.adoc[bslstl]::xref:BloombergLP/bslstl/StringRefImp-02.adoc[StringRefImp<char>]::operator[]
:relfileprefix: ../../../
:mrdocs:

Return a reference providing a non‐modifiable access to the character at the specified `index` in the string bound to this reference. This reference remains valid as long as the string currently bound to this object remains valid. The behavior is undefined unless `0 <= index < length()`.

== Synopsis

Declared in `<bslstl_stringref.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:BloombergLP/bslstl/StringRefImp-02/const_reference.adoc[const_reference]
operator[](xref:BloombergLP/bslstl/StringRefImp-0c/size_type.adoc[size_type] index) const;
----


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