Add XML header with optionally specified encoding to the specified stream, with formatting depending on the specified state, and update state accordingly. Return the stream. Version is always "1.0". The behavior is undefined unless addHeader is the first manipulator (with the exception of rawOutputStream) after construction or reset.
Declared in <balxml_formatter_compactimpl.h>
static
std::ostream&
addHeader(
std::ostream& stream,
State* state,
std::string_view const& encoding);