[#BloombergLP-bdlsb]
= xref:BloombergLP.adoc[BloombergLP]::bdlsb
:relfileprefix: ../
:mrdocs:

Components in the `bdlsb` package provide streambuf utilities.

== Types

[cols="1,4"]
|===
| Name| Description
| xref:BloombergLP/bdlsb/FixedMemInStreamBuf.adoc[`FixedMemInStreamBuf`] 
| This class implements the input functionality of the `basic_streambuf` protocol, using client‐supplied `char *` memory.
| xref:BloombergLP/bdlsb/FixedMemInput.adoc[`FixedMemInput`] 
| This class, like `bdlsb::FixedMemInStreamBuf`, implements the input functionality of the `basic_streambuf` interface, using client‐supplied `char *` memory. It has an interface identical to `bdlsb::FixedMemInStreamBuf` but does _not_ inherit from `bsl::streambuf`. This implementation is advantageous for performance reasons, as the overhead of the initialization and virtual function calls of a `bsl::streambuf` can be undesirable. It is especially designed for streaming a very small amount of information from a fixed‐length buffer using a `bslx_genericinstream` when the number of characters read from the input is guaranteed not to exceed the length of the buffer. Note that this class is not designed to be derived from.
| xref:BloombergLP/bdlsb/FixedMemOutStreamBuf.adoc[`FixedMemOutStreamBuf`] 
| This class implements the output functionality of the `basic_streambuf` protocol for client‐supplied memory.
| xref:BloombergLP/bdlsb/FixedMemOutput.adoc[`FixedMemOutput`] 
| This class, like `bdlsb::FixedMemOutStreamBuf`, implements the output functionality of the `basic_streambuf` interface, using client‐supplied `char *` memory. It has an identical interface to `bdlsb::FixedMemOutStreamBuf` but does _not_ inherit from `bsl::streambuf`. Thus, it is suitable for use as template parameter to `bslx::GenericOutStream` (but not to `bslx::StreambufOutStream`). Note that this class is not designed to be derived from.
| xref:BloombergLP/bdlsb/MemOutStreamBuf.adoc[`MemOutStreamBuf`] 
| This `class` implements the output functionality of the `basic_streambuf` protocol, using a user‐supplied or default `bslma` allocator to supply memory.
| xref:BloombergLP/bdlsb/MemOutStreamBuf_Util.adoc[`MemOutStreamBuf_Util`] 
| Utility functions for `MemOutStreamBuf` buffer management.
| xref:BloombergLP/bdlsb/OverflowMemOutStreamBuf.adoc[`OverflowMemOutStreamBuf`] 
| This class implements the output functionality of the `bsl::basic_streambuf` protocol, using client‐supplied memory and client‐supplied allocator if additional memory is needed.
| xref:BloombergLP/bdlsb/OverflowMemOutput.adoc[`OverflowMemOutput`] 
| This class, like `bdlsb::OverflowMemOutStreamBuf`, implements the output functionality of the `bsl::basic_streambuf` interface, using a client‐supplied buffer and allocator‐supplied overflow buffer if additional memory is needed. It has an interface similar to `bdlsb::OverflowMemOutStreamBuf` but does *not* inherit from `bsl::streambuf`. Thus, it is suitable for use as template parameter to `bslx::GenericByteOutStream` (but not to `bslx::ByteOutStream` or `bslx::ByteOutStreamFormatter`). Note that this class is not designed to be derived from.
|===



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