DwmStreamIOCapable.hh

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//===========================================================================
// @(#) $DwmPath$
//===========================================================================
//  Copyright (c) Daniel W. McRobb 2020, 2024
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//---------------------------------------------------------------------------
//---------------------------------------------------------------------------
 
#ifndef _DWMSTREAMIOCAPABLE_HH_
#define _DWMSTREAMIOCAPABLE_HH_
 
#include <iostream>
 
namespace Dwm {
 
  //--------------------------------------------------------------------------
  //--------------------------------------------------------------------------
  template <typename T>
  concept HasStreamRead = requires(T & t, std::istream & is) {
    { t.Read(is) } -> std::same_as<std::istream &>;
  };
 
  //--------------------------------------------------------------------------
  //--------------------------------------------------------------------------
  template <typename T>
  concept HasStreamWrite = requires(const T & t, std::ostream & os) {
    { t.Write(os) } -> std::same_as<std::ostream &>;
  };
  
  //--------------------------------------------------------------------------
  //--------------------------------------------------------------------------
  class StreamReadable
  {
  public:
    //------------------------------------------------------------------------
    //------------------------------------------------------------------------
    virtual ~StreamReadable() { }
 
    //------------------------------------------------------------------------
    //------------------------------------------------------------------------
    virtual std::istream & Read(std::istream & is) = 0;
  }; 
 
  //--------------------------------------------------------------------------
  //--------------------------------------------------------------------------
  class StreamWritable
  {
  public:
    //------------------------------------------------------------------------
    //------------------------------------------------------------------------
    virtual ~StreamWritable() { }
 
    //------------------------------------------------------------------------
    //------------------------------------------------------------------------
    virtual std::ostream & Write(std::ostream & os) const = 0;
  };
  
  //--------------------------------------------------------------------------
  //--------------------------------------------------------------------------
  class StreamIOCapable
    : public StreamReadable, public StreamWritable
  {};
  
}  // namespace Dwm
 
#endif  // _DWMSTREAMIOCAPABLE_HH_
 
 
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