BloombergLP::bslx::GenericOutStream::putFloat64

Write to the stream supplied at construction the eight‐byte IEEE double‐precision floating‐point number (in network byte order) comprised of the most‐significant eight bytes of the specified value (in host byte order), and return a reference to this stream. If this stream is initially invalid, this operation has no effect. Note that for non‐conforming platforms, this operation may be lossy.