[#bsl-basic_ostringstream-2constructor-0d]
= xref:bsl.adoc[bsl]::xref:bsl/basic_ostringstream.adoc[basic_ostringstream]::basic_ostringstream
:relfileprefix: ../../
:mrdocs:

Create a `basic_ostringstream` object. Use the specified `initialString` as the value that will be returned by a call to `str` prior to any streaming operations performed on this object. `rdbuf` is created using `ios_base::out`. Optionally specify the `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_ostringstream.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
template<class SALLOC>
basic_ostringstream(
    xref:bsl/basic_string-0faf.adoc[bsl::basic_string<CHAR_TYPE, CHAR_TRAITS, SALLOC>] const& initialString,
    xref:bsl/basic_ostringstream/allocator_type.adoc[allocator_type] const& allocator = allocator_type())
requires !bsl::is_same<ALLOCATOR, SALLOC>::value;
----


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