[#bsl-basic_string-0e-2constructor-078]
= xref:bsl.adoc[bsl]::xref:bsl/basic_string-0e.adoc[basic_string<wchar_t>]::basic_string
:relfileprefix: ../../
:mrdocs:

Create a string that has the same value as the substring of the specified `numChars` length starting at the specified `position` in the specified `original` string. If `numChars` equals `npos`, then the remaining length of the string is used (i.e., `numChars` is set to `original.length() ‐ position`). Optionally specify the `basicAllocator` used to supply memory. If `basicAllocator` is not specified, a default‐constructed allocator is used. Throw `out_of_range` if `position > original.length()`.

== Synopsis

Declared in `<bslstl_string.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
basic_string(
    xref:bsl/basic_string-0faf.adoc[basic_string<wchar_t>] const& original,
    xref:bsl/basic_string-0e/size_type.adoc[size_type] position,
    xref:bsl/basic_string-0e/size_type.adoc[size_type] numChars,
    xref:bsl/allocator-0df.adoc[allocator<wchar_t>] const& basicAllocator = ALLOCATOR());
----


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