[#bsl-basic_string-0faf-2constructor-06]
= xref:bsl.adoc[bsl]::xref:bsl/basic_string-0faf.adoc[basic_string]::basic_string
:relfileprefix: ../../
:mrdocs:

Create a string from the first `numChars` of `characterString`.

== Synopsis

Declared in `<bslstl_string.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
basic_string(
    CHAR_TYPE const* characterString,
    xref:bsl/basic_string-0faf/size_type.adoc[size_type] numChars,
    ALLOCATOR const& basicAllocator = ALLOCATOR());
----

== Description

Create a string that has the same value as the substring of the optionally specified `numChars` length starting at the beginning of the specified `characterString`. If `numChars` is not specified, `CHAR_TRAITS::length(characterString)` is used. Optionally specify the `basicAllocator` used to supply memory. If `basicAllocator` is not specified, a default‐constructed allocator is used. Throw `out_of_range` if `numChars >= npos`.

== Parameters

[cols="1,4"]
|===
| Name| Description
| *characterString*
| character array used to initialize the string
| *numChars*
| number of characters to take from `characterString`
| *basicAllocator*
| allocator used to supply memory
|===


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