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Editing: dstream.hpp

//
// Copyright (c) 2016-2019 Vinnie Falco (vinnie dot falco at gmail dot com)
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
// Official repository: https://github.com/boostorg/beast
//

#ifndef BOOST_BEAST_UNIT_TEST_DSTREAM_HPP
#define BOOST_BEAST_UNIT_TEST_DSTREAM_HPP

#include <boost/config.hpp>
#include <ios>
#include <memory>
#include <ostream>
#include <sstream>
#include <streambuf>
#include <string>

#ifdef BOOST_WINDOWS
#include <boost/winapi/basic_types.hpp>
#include <boost/winapi/debugapi.hpp>
#endif

namespace boost {
namespace beast {
namespace unit_test {

#ifdef BOOST_WINDOWS

namespace detail {

template<class CharT, class Traits, class Allocator>
class dstream_buf
    : public std::basic_stringbuf<CharT, Traits, Allocator>
{
    using ostream = std::basic_ostream<CharT, Traits>;

ostream& os_;
    bool dbg_;

template<class T>
    void write(T const*) = delete;

void write(char const* s)
    {
        if(dbg_)
            boost::winapi::OutputDebugStringA(s);
        os_ << s;
    }

void write(wchar_t const* s)
    {
        if(dbg_)
            boost::winapi::OutputDebugStringW(s);
        os_ << s;
    }

public:
    explicit
    dstream_buf(ostream& os)
        : os_(os)
        , dbg_(boost::winapi::IsDebuggerPresent() != 0)
    {
    }

~dstream_buf()
    {
        sync();
    }

int
    sync() override
    {
        write(this->str().c_str());
        this->str("");
        return 0;
    }
};

} // detail

/** std::ostream with Visual Studio IDE redirection.

Instances of this stream wrap a specified `std::ostream`
    (such as `std::cout` or `std::cerr`). If the IDE debugger
    is attached when the stream is created, output will be
    additionally copied to the Visual Studio Output window.
*/
template<
    class CharT,
    class Traits = std::char_traits<CharT>,
    class Allocator = std::allocator<CharT>
>
class basic_dstream
    : public std::basic_ostream<CharT, Traits>
{
    detail::dstream_buf<
        CharT, Traits, Allocator> buf_;

public:
    /** Construct a stream.

@param os The output stream to wrap.
    */
    explicit
    basic_dstream(std::ostream& os)
        : std::basic_ostream<CharT, Traits>(&buf_)
        , buf_(os)
    {
        if(os.flags() & std::ios::unitbuf)
            std::unitbuf(*this);
    }
};

using dstream = basic_dstream<char>;
using dwstream = basic_dstream<wchar_t>;

#else

using dstream = std::ostream&;
using dwstream = std::wostream&;

#endif

} // unit_test
} // beast
} // boost

#endif

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