[#bsl-basic_osyncstream-2constructor-04]
= xref:bsl.adoc[bsl]::xref:bsl/basic_osyncstream.adoc[basic_osyncstream]::basic_osyncstream
:relfileprefix: ../../
:mrdocs:

Create a `basic_osycnstream` object that will forward stream output to the specified `wrapped` buffer. Optionally specify an `allocator` used to supply memory. If `allocator` is not supplied, a default‐constructed object of the (template parameter) `ALLOCATOR` type is used. If the `ALLOCATOR` argument is of type `bsl::allocator` (the default), then `allocator`, if supplied, shall be convertible to `bslma::Allocator *`. If the `ALLOCATOR` argument is of type `bsl::allocator` and `allocator` is not supplied, the currently installed default allocator will be used to supply memory.

== Synopsis

Declared in `<bslstl_osyncstream.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
explicit
basic_osyncstream(
    xref:bsl/basic_osyncstream/streambuf_type.adoc[streambuf_type]* wrapped,
    ALLOCATOR const& allocator = ALLOCATOR());
----


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