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 /*
 Open Asset Import Library (assimp)
 ----------------------------------------------------------------------
 
 Copyright (c) 2006-2024, 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,
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 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  TinyFormatter.h
  *  @brief Utility to format log messages more easily. Introduced
  *    to get rid of the boost::format dependency. Much slinker,
  *    basically just extends stringstream.
  */
 #pragma once
 #ifndef INCLUDED_TINY_FORMATTER_H
 #define INCLUDED_TINY_FORMATTER_H
 
 #ifdef __GNUC__
 #   pragma GCC system_header
 #endif
 
 #include <sstream>
 
 namespace Assimp {
 namespace Formatter {
 
 // ------------------------------------------------------------------------------------------------
 /** stringstream utility. Usage:
  *  @code
  *  void writelog(const std::string&s);
  *  void writelog(const std::wstring&s);
  *  ...
  *  writelog(format()<< "hi! this is a number: " << 4);
  *  writelog(wformat()<< L"hi! this is a number: " << 4);
  *
  *  @endcode */
 template < typename T,
     typename CharTraits = std::char_traits<T>,
     typename Allocator  = std::allocator<T> >
 class basic_formatter {
 public:
     typedef class std::basic_string<T,CharTraits,Allocator> string;
     typedef class std::basic_ostringstream<T,CharTraits,Allocator> stringstream;
 
     basic_formatter() {
         // empty
     }
 
     /* Allow basic_formatter<T>'s to be used almost interchangeably
      * with std::(w)string or const (w)char* arguments because the
      * conversion c'tor is called implicitly. */
     template <typename TT>
     basic_formatter(const TT& sin)  {
         underlying << sin;
     }
 
     // Same problem as the copy constructor below, but with root cause is that stream move
     // is not permitted on older GCC versions. Small performance impact on those platforms.
 #if defined(__GNUC__) && (__GNUC__ == 4 && __GNUC_MINOR__ <= 9)
     basic_formatter(basic_formatter&& other) {
         underlying << (string)other;
     }
 #else
     basic_formatter(basic_formatter&& other)
         : underlying(std::move(other.underlying)) {
     }
 #endif
 
     // The problem described here:
     // https://sourceforge.net/tracker/?func=detail&atid=1067632&aid=3358562&group_id=226462
     // can also cause trouble here. Apparently, older gcc versions sometimes copy temporaries
     // being bound to const ref& function parameters. Copying streams is not permitted, though.
     // This workaround avoids this by manually specifying a copy ctor.
 #if !defined(__GNUC__) || !defined(__APPLE__) || __GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 6)
     explicit basic_formatter(const basic_formatter& other) {
         underlying << (string)other;
     }
 #endif
 
     operator string () const {
         return underlying.str();
     }
 
     /* note - this is declared const because binding temporaries does only
      * work for const references, so many function prototypes will
      * include const basic_formatter<T>& s but might still want to
      * modify the formatted string without the need for a full copy.*/
     template <typename TToken, typename std::enable_if<!std::is_base_of<std::exception, TToken>::value>::type * = nullptr>
     const basic_formatter &operator<<(const TToken &s) const {
         underlying << s;
         return *this;
     }
 
     template <typename TToken, typename std::enable_if<std::is_base_of<std::exception, TToken>::value>::type * = nullptr>
     const basic_formatter &operator<<(const TToken &s) const {
         underlying << s.what();
         return *this;
     }
 
     template <typename TToken, typename std::enable_if<!std::is_base_of<std::exception, TToken>::value>::type * = nullptr>
     basic_formatter &operator<<(const TToken &s) {
         underlying << s;
         return *this;
     }
 
     template <typename TToken, typename std::enable_if<std::is_base_of<std::exception, TToken>::value>::type * = nullptr>
     basic_formatter &operator<<(const TToken &s) {
         underlying << s.what();
         return *this;
     }
 
 
     // comma operator overloaded as well, choose your preferred way.
     template <typename TToken>
     const basic_formatter& operator, (const TToken& s) const {
         *this << s;
         return *this;
     }
 
     template <typename TToken>
     basic_formatter& operator, (const TToken& s) {
         *this << s;
         return *this;
     }
 
     // Fix for MSVC8
     // See https://sourceforge.net/projects/assimp/forums/forum/817654/topic/4372824
     template <typename TToken>
     basic_formatter& operator, (TToken& s) {
         *this << s;
         return *this;
     }
 
 
 private:
     mutable stringstream underlying;
 };
 
 
 typedef basic_formatter< char > format;
 typedef basic_formatter< wchar_t > wformat;
 
 } // ! namespace Formatter
 
 } // ! namespace Assimp
 
 #endif

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