DwmFileIOCapable.hh

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//===========================================================================
// @(#) $DwmPath$
//===========================================================================
//  Copyright (c) Daniel W. McRobb 2020, 2024
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//---------------------------------------------------------------------------
//---------------------------------------------------------------------------
 
#ifndef _DWMFILEIOCAPABLE_HH_
#define _DWMFILEIOCAPABLE_HH_
 
#include <cstdio>
 
namespace Dwm {
 
  //--------------------------------------------------------------------------
  //--------------------------------------------------------------------------
  template <typename T>
  concept HasFileRead = requires(T & t, FILE *f) {
    { t.Read(f) } -> std::same_as<size_t>;
  };
 
  //--------------------------------------------------------------------------
  //--------------------------------------------------------------------------
  template <typename T>
  concept HasFileWrite = requires(const T & t, FILE *f) {
    { t.Write(f) } -> std::same_as<size_t>;
  };
 
  //--------------------------------------------------------------------------
  //--------------------------------------------------------------------------
  class FileReadable
  {
  public:
    //------------------------------------------------------------------------
    //------------------------------------------------------------------------
    virtual ~FileReadable() { }
 
    //------------------------------------------------------------------------
    //------------------------------------------------------------------------
    virtual size_t Read(FILE * f) = 0;
  };
  
  //--------------------------------------------------------------------------
  //--------------------------------------------------------------------------
  class FileWritable
  {
  public:
    //------------------------------------------------------------------------
    //------------------------------------------------------------------------
    virtual ~FileWritable() { }
 
    //------------------------------------------------------------------------
    //------------------------------------------------------------------------
    virtual size_t Write(FILE *f) const = 0;
  };
 
  //--------------------------------------------------------------------------
  //--------------------------------------------------------------------------
  class FileIOCapable : public FileReadable, public FileWritable { };
  
}  // namespace Dwm
 
#endif  // _DWMFILEIOCAPABLE_HH_
 
 
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