[#bsl-basic_string-01d-2constructor-01]
= xref:bsl.adoc[bsl]::xref:bsl/basic_string-01d.adoc[basic_string<char8_t>]::basic_string
:relfileprefix: ../../
:mrdocs:

Create a string that has the same value as the substring starting at the specified `position` in the specified `original` string. Optionally specify the `basicAllocator` used to supply memory. If `basicAllocator` is not specified, a default‐constructed allocator is used. The contents of `original` are moved (in constant time) to the new string if `basicAllocator == original.get_allocator()`, and are copied (in linear time) using `basicAllocator` otherwise. `original` is left in a valid but unspecified state. Throw `out_of_range` if `position > original.length()`.

== Synopsis

Declared in `<bslstl_string.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
basic_string(
    xref:BloombergLP/bslmf/MovableRef.adoc[BloombergLP::bslmf::MovableRef<basic_string<char8_t>>] original,
    xref:bsl/basic_string-01d/size_type.adoc[size_type] position,
    xref:bsl/allocator-0df.adoc[allocator<char8_t>] const& basicAllocator = ALLOCATOR());
----


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