Write the specified numChars characters from the specified source to the stream buffer. Return the number of characters successfully written. The behavior is undefined unless '(source && 0 < numChars) || 0 == numChars'.
Synopsis
Declared in <bdlsb_memoutstreambuf.h>
virtual
std::streamsize
xsputn(
char_type const* source,
std::streamsize numChars) override;
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