DwmStreamedLengthCapable.hh

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//===========================================================================
// @(#) $DwmPath$
//===========================================================================
//  Copyright (c) Daniel W. McRobb 2020
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//---------------------------------------------------------------------------
//---------------------------------------------------------------------------
 
#ifndef _DWMSTREAMEDLENGTHCAPABLE_HH_
#define _DWMSTREAMEDLENGTHCAPABLE_HH_
 
#include <cstdint>
 
namespace Dwm {
 
  //--------------------------------------------------------------------------
  //--------------------------------------------------------------------------
  template <typename T>
  concept HasStreamedLength = requires (const T & t) {
    { t.StreamedLength() } -> std::same_as<uint64_t>;
  };
  
  //--------------------------------------------------------------------------
  //--------------------------------------------------------------------------
  class StreamedLengthCapable
  {
  public:
    //------------------------------------------------------------------------
    //------------------------------------------------------------------------
    virtual uint64_t StreamedLength() const = 0;
  };
  
}  // namespace Dwm
 
#endif  // _DWMSTREAMEDLENGTHCAPABLE_HH_
 
 
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