[#bsl-basic_ostringstream-2constructor-0c25]
= xref:bsl.adoc[bsl]::xref:bsl/basic_ostringstream.adoc[basic_ostringstream]::basic_ostringstream
:relfileprefix: ../../
:mrdocs:

Create a `basic_ostringstream` object. Use the specified `initialString` (of a type convertible to `basic_string_view<CHAR_TYPE, CHAR_TRAITS>` but not to `const CHAR_TYPE *`) indicating the initial sequence of characters that have been written to this stream. Use the specified `modeBitMask` to indicate whether this buffer may be read from, written to, or both. `rdbuf` is created using `modeBitMask | 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 STRING_VIEW_LIKE_TYPE>
basic_ostringstream(
    STRING_VIEW_LIKE_TYPE const& initialString,
    ios_base::openmode modeBitMask);
----


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