src/openvic-dataloader/detail/NullBuff.hpp


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#pragma once

#include <ostream>

namespace ovdl::detail {
   template<class cT, class traits = std::char_traits<cT>>
   class basic_nullbuf : public std::basic_streambuf<cT, traits> {
      typename traits::int_type overflow(typename traits::int_type c) {
         return traits::not_eof(c); // indicate success
      }
   };

   template<class cT, class traits = std::char_traits<cT>>
   class basic_onullstream : public std::basic_ostream<cT, traits> {
   public:
      basic_onullstream() : std::basic_ios<cT, traits>(&m_sbuf),
                       std::basic_ostream<cT, traits>(&m_sbuf) {
         std::basic_ios<cT, traits>::init(&m_sbuf);
      }

   private:
      basic_nullbuf<cT, traits> m_sbuf;
   };

   using onullstream = basic_onullstream<char>;
   using wonullstream = basic_onullstream<wchar_t>;

   static inline onullstream cnull;
   static inline onullstream wcnull;
}