[#bsl-basic_string-0faf-substr-0f]
= xref:bsl.adoc[bsl]::xref:bsl/basic_string-0faf.adoc[basic_string]::substr
:relfileprefix: ../../
:mrdocs:

Return a substring of this string as an rvalue.

== Synopsis

Declared in `<bslstl_string.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
xref:bsl/basic_string-0faf.adoc[basic_string]
substr(
    xref:bsl/basic_string-0faf/size_type.adoc[size_type] position = 0,
    xref:bsl/basic_string-0faf/size_type.adoc[size_type] numChars = npos) &&;
----


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