XalanTransformer output to standard out?

Question

Using Xalan I have an XalanTransformer that produces output to a file. How do I make it go to standard out instead?

#include <sstream>
#include <xalanc/Include/PlatformDefinitions.hpp>
#include <xercesc/util/PlatformUtils.hpp>
#include <xalanc/XalanTransformer/XalanTransformer.hpp>
constexpr auto REPORT_FILE {"report.html"};
....
std::stringstream xml_doc; xml_doc << ....;
std::stringstream style_sheet; style_sheet << ....;
XALAN_USING_XERCES(XMLPlatformUtils)
XALAN_USING_XALAN(XalanTransformer)
XMLPlatformUtils::Initialize();
XalanTransformer::initialize();
XalanTransformer transformer;
transformer.transform(xml_doc, style_sheet, REPORT_FILE);

Answer 1

#include <iostream>

if (transformer.transform(xml_doc, style_sheet, std::cout) != 0)

The input source and result target can be a file name, a stream or a root node.

int xalanc::XalanTransformer::transform (
    const XSLTInputSource &theInputSource,
    const XalanCompiledStylesheet *heCompiledStylesheet,
    const XSLTResultTarget &theResultTarget)

int xalanc::XalanTransformer::transform

The question used a file name the result target. The answer uses a stream, std:cout.

The global objects std::cout and std::wcout control output to a stream buffer of implementation-defined type (derived from std::streambuf), associated with the standard C output stream stdout.

cppreference.com std::cout