[#bsl-vector-099-front-02] = xref:bsl.adoc[bsl]::xref:bsl/vector-099.adoc[vector<pair<Date, DayOfWeekSet>>]::front :relfileprefix: ../../ :mrdocs: Return a reference providing modifiable access to the first element in this vector. The behavior is undefined unless this vector is not empty. == Synopsis Declared in `<bslstl_vector.h>` [source,cpp,subs="verbatim,replacements,macros,-callouts"] ---- xref:bsl/vectorBase-06a.adoc[reference] front(); ---- [.small]#Created with https://www.mrdocs.com[MrDocs]#