DwmGZIOCapable.hh

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//===========================================================================
// @(#) $DwmPath$
//===========================================================================
//  Copyright (c) Daniel W. McRobb 2020, 2024
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//---------------------------------------------------------------------------
//---------------------------------------------------------------------------
 
#ifndef _DWMGZIOCAPABLE_HH_
#define _DWMGZIOCAPABLE_HH_
 
extern "C" {
  #include <sys/types.h>
  #include <zlib.h>
}
 
#include <cstdio>
 
namespace Dwm {
 
  //--------------------------------------------------------------------------
  //--------------------------------------------------------------------------
  template <typename T>
  concept HasGZRead = requires(T & t, gzFile gzf) {
    { t.Read(gzf) } -> std::same_as<int>;
  };
  
  //--------------------------------------------------------------------------
  //--------------------------------------------------------------------------
  template <typename T>
  concept HasGZWrite = requires(const T & t, gzFile gzf) {
    { t.Write(gzf) } -> std::same_as<int>;
  };
      
  //--------------------------------------------------------------------------
  //--------------------------------------------------------------------------
  class GZReadable
  {
  public:
    //------------------------------------------------------------------------
    //------------------------------------------------------------------------
    virtual ~GZReadable() { }
 
    //------------------------------------------------------------------------
    //------------------------------------------------------------------------
    virtual int Read(gzFile gzf) = 0;
  };
 
  //--------------------------------------------------------------------------
  //--------------------------------------------------------------------------
  class GZWritable
  {
  public:
    //------------------------------------------------------------------------
    //------------------------------------------------------------------------
    virtual ~GZWritable() { }
 
    //------------------------------------------------------------------------
    //------------------------------------------------------------------------
    virtual int Write(gzFile gzf) const = 0;
  };
  
  //--------------------------------------------------------------------------
  //--------------------------------------------------------------------------
  class GZIOCapable
    : public GZReadable, public GZWritable 
  {};
  
}  // namespace Dwm
 
#endif  // _DWMGZIOENABLED_HH_
 
 
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