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        std::streambuf* m_prevBuf;

    public:
        RedirectedStream( std::ostream& originalStream, std::ostream& redirectionStream );
        ~RedirectedStream();
    };

    class RedirectedStdOut {
        ReusableStringStream m_rss;
        RedirectedStream m_cout;
    public:
        RedirectedStdOut();
        auto str() const -> std::string;
    };

    // StdErr has two constituent streams in C++, std::cerr and std::clog
    // This means that we need to redirect 2 streams into 1 to keep proper
    // order of writes
    class RedirectedStdErr {
        ReusableStringStream m_rss;
        RedirectedStream m_cerr;
        RedirectedStream m_clog;
    public:
        RedirectedStdErr();
        auto str() const -> std::string;
    };

#if defined(CATCH_CONFIG_NEW_CAPTURE)

    // Windows's implementation of std::tmpfile is terrible (it tries
    // to create a file inside system folder, thus requiring elevated
    // privileges for the binary), so we have to use tmpnam(_s) and
    // create the file ourselves there.
    class TempFile {
    public:
        TempFile(TempFile const&) = delete;
        TempFile& operator=(TempFile const&) = delete;
        TempFile(TempFile&&) = delete;
        TempFile& operator=(TempFile&&) = delete;

        TempFile();
        ~TempFile();

        std::FILE* getFile();
        std::string getContents();

    private:
        std::FILE* m_file = nullptr;
    #if defined(_MSC_VER)
        char m_buffer[L_tmpnam] = { 0 };
    #endif
    };

    class OutputRedirect {
    public:
        OutputRedirect(OutputRedirect const&) = delete;
        OutputRedirect& operator=(OutputRedirect const&) = delete;
        OutputRedirect(OutputRedirect&&) = delete;
        OutputRedirect& operator=(OutputRedirect&&) = delete;

        OutputRedirect(std::string& stdout_dest, std::string& stderr_dest);
        ~OutputRedirect();

    private:
        int m_originalStdout = -1;
        int m_originalStderr = -1;
        TempFile m_stdoutFile;
        TempFile m_stderrFile;
        std::string& m_stdoutDest;
        std::string& m_stderrDest;
    };

#endif

} // end namespace Catch

#endif // TWOBLUECUBES_CATCH_OUTPUT_REDIRECT_H
// end catch_output_redirect.h
#include <cstdio>
#include <cstring>
#include <fstream>
#include <sstream>
#include <stdexcept>

#if defined(CATCH_CONFIG_NEW_CAPTURE)
    #if defined(_MSC_VER)
    #include <io.h>      //_dup and _dup2
    #define dup _dup
    #define dup2 _dup2
    #define fileno _fileno
    #else
    #include <unistd.h>  // dup and dup2
    #endif
#endif

namespace Catch {

    RedirectedStream::RedirectedStream( std::ostream& originalStream, std::ostream& redirectionStream )
    :   m_originalStream( originalStream ),
        m_redirectionStream( redirectionStream ),
        m_prevBuf( m_originalStream.rdbuf() )
    {
        m_originalStream.rdbuf( m_redirectionStream.rdbuf() );
    }

    RedirectedStream::~RedirectedStream() {
        m_originalStream.rdbuf( m_prevBuf );
    }

    RedirectedStdOut::RedirectedStdOut() : m_cout( Catch::cout(), m_rss.get() ) {}
    auto RedirectedStdOut::str() const -> std::string { return m_rss.str(); }

    RedirectedStdErr::RedirectedStdErr()
    :   m_cerr( Catch::cerr(), m_rss.get() ),
        m_clog( Catch::clog(), m_rss.get() )
    {}
    auto RedirectedStdErr::str() const -> std::string { return m_rss.str(); }

#if defined(CATCH_CONFIG_NEW_CAPTURE)

#if defined(_MSC_VER)
    TempFile::TempFile() {
        if (tmpnam_s(m_buffer)) {
            CATCH_RUNTIME_ERROR("Could not get a temp filename");
        }
        if (fopen_s(&m_file, m_buffer, "w")) {
            char buffer[100];
            if (strerror_s(buffer, errno)) {
                CATCH_RUNTIME_ERROR("Could not translate errno to a string");
            }
            CATCH_RUNTIME_ERROR("Coul dnot open the temp file: '" << m_buffer << "' because: " << buffer);
        }
    }
#else
    TempFile::TempFile() {
        m_file = std::tmpfile();
        if (!m_file) {
            CATCH_RUNTIME_ERROR("Could not create a temp file.");
        }
    }

#endif

    TempFile::~TempFile() {
         // TBD: What to do about errors here?
         std::fclose(m_file);
         // We manually create the file on Windows only, on Linux
         // it will be autodeleted
#if defined(_MSC_VER)
         std::remove(m_buffer);
#endif
    }

    FILE* TempFile::getFile() {
        return m_file;
    }

    std::string TempFile::getContents() {
        std::stringstream sstr;
        char buffer[100] = {};
        std::rewind(m_file);
        while (std::fgets(buffer, sizeof(buffer), m_file)) {
            sstr << buffer;
        }
        return sstr.str();
    }

    OutputRedirect::OutputRedirect(std::string& stdout_dest, std::string& stderr_dest) :
        m_originalStdout(dup(1)),
        m_originalStderr(dup(2)),
        m_stdoutDest(stdout_dest),
        m_stderrDest(stderr_dest) {
        dup2(fileno(m_stdoutFile.getFile()), 1);
        dup2(fileno(m_stderrFile.getFile()), 2);
    }

    OutputRedirect::~OutputRedirect() {
        Catch::cout() << std::flush;
        fflush(stdout);
        // Since we support overriding these streams, we flush cerr
        // even though std::cerr is unbuffered
        Catch::cerr() << std::flush;
        Catch::clog() << std::flush;
        fflush(stderr);

        dup2(m_originalStdout, 1);
        dup2(m_originalStderr, 2);

        m_stdoutDest += m_stdoutFile.getContents();
        m_stderrDest += m_stderrFile.getContents();
    }

#endif // CATCH_CONFIG_NEW_CAPTURE

} // namespace Catch

#if defined(CATCH_CONFIG_NEW_CAPTURE)
    #if defined(_MSC_VER)
    #undef dup
    #undef dup2
    #undef fileno
    #endif
#endif
// end catch_output_redirect.cpp
// start catch_random_number_generator.cpp

namespace Catch {

    std::mt19937& rng() {
        static std::mt19937 s_rng;
        return s_rng;
    }

    void seedRng( IConfig const& config ) {
        if( config.rngSeed() != 0 ) {
            std::srand( config.rngSeed() );
            rng().seed( config.rngSeed() );
        }
    }

    unsigned int rngSeed() {
        return getCurrentContext().getConfig()->rngSeed();
    }
}
// end catch_random_number_generator.cpp
// start catch_registry_hub.cpp

// start catch_test_case_registry_impl.h

#include <vector>
#include <set>
#include <algorithm>
#include <ios>

namespace Catch {

    class TestCase;
    struct IConfig;

    std::vector<TestCase> sortTests( IConfig const& config, std::vector<TestCase> const& unsortedTestCases );
    bool matchTest( TestCase const& testCase, TestSpec const& testSpec, IConfig const& config );

    void enforceNoDuplicateTestCases( std::vector<TestCase> const& functions );

    std::vector<TestCase> filterTests( std::vector<TestCase> const& testCases, TestSpec const& testSpec, IConfig const& config );
    std::vector<TestCase> const& getAllTestCasesSorted( IConfig const& config );

    class TestRegistry : public ITestCaseRegistry {
    public:
        virtual ~TestRegistry() = default;