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+/*
+Open Asset Import Library (assimp)
+----------------------------------------------------------------------
+
+Copyright (c) 2006-2022, assimp team
+
+All rights reserved.
+
+Redistribution and use of this software in source and binary forms,
+with or without modification, are permitted provided that the
+following conditions are met:
+
+* Redistributions of source code must retain the above
+  copyright notice, this list of conditions and the
+  following disclaimer.
+
+* Redistributions in binary form must reproduce the above
+  copyright notice, this list of conditions and the
+  following disclaimer in the documentation and/or other
+  materials provided with the distribution.
+
+* Neither the name of the assimp team, nor the names of its
+  contributors may be used to endorse or promote products
+  derived from this software without specific prior
+  written permission of the assimp team.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+----------------------------------------------------------------------
+*/
+
+/** @file LogStream.hpp
+ *  @brief Abstract base class 'LogStream', representing an output log stream.
+ */
+#pragma once
+#ifndef INCLUDED_AI_LOGSTREAM_H
+#define INCLUDED_AI_LOGSTREAM_H
+
+#ifdef __GNUC__
+#pragma GCC system_header
+#endif
+
+#include "types.h"
+
+namespace Assimp {
+
+class IOSystem;
+
+// ------------------------------------------------------------------------------------
+/** @brief CPP-API: Abstract interface for log stream implementations.
+ *
+ *  Several default implementations are provided, see #aiDefaultLogStream for more
+ *  details. Writing your own implementation of LogStream is just necessary if these
+ *  are not enough for your purpose. */
+class ASSIMP_API LogStream
+#ifndef SWIG
+        : public Intern::AllocateFromAssimpHeap
+#endif
+{
+protected:
+    /** @brief  Default constructor */
+    LogStream() AI_NO_EXCEPT;
+
+public:
+    /** @brief  Virtual destructor  */
+    virtual ~LogStream();
+
+    // -------------------------------------------------------------------
+    /** @brief  Overwrite this for your own output methods
+     *
+     *  Log messages *may* consist of multiple lines and you shouldn't
+     *  expect a consistent formatting. If you want custom formatting
+     *  (e.g. generate HTML), supply a custom instance of Logger to
+     *  #DefaultLogger:set(). Usually you can *expect* that a log message
+     *  is exactly one line and terminated with a single \n character.
+     *  @param message Message to be written */
+    virtual void write(const char *message) = 0;
+
+    // -------------------------------------------------------------------
+    /** @brief Creates a default log stream
+     *  @param streams Type of the default stream
+     *  @param name For aiDefaultLogStream_FILE: name of the output file
+     *  @param io For aiDefaultLogStream_FILE: IOSystem to be used to open the output
+     *   file. Pass nullptr for the default implementation.
+     *  @return New LogStream instance.  */
+    static LogStream *createDefaultStream(aiDefaultLogStream stream,
+            const char *name = "AssimpLog.txt",
+            IOSystem *io = nullptr);
+
+}; // !class LogStream
+
+inline LogStream::LogStream() AI_NO_EXCEPT {
+    // empty
+}
+
+inline LogStream::~LogStream() {
+    // empty
+}
+
+} // Namespace Assimp
+
+#endif // INCLUDED_AI_LOGSTREAM_H