DwmBZ2IOCapable.hh

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//===========================================================================
// @(#) $DwmPath$
//===========================================================================
//  Copyright (c) Daniel W. McRobb 2020, 2024
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//---------------------------------------------------------------------------
//---------------------------------------------------------------------------
 
#ifndef _DWMBZ2IOCAPABLE_HH_
#define _DWMBZ2IOCAPABLE_HH_
 
extern "C" {
  #include <sys/types.h>
  #include <bzlib.h>
}
 
#include <cstdio>
 
namespace Dwm {
 
  //--------------------------------------------------------------------------
  //--------------------------------------------------------------------------
  template <typename T>
  concept HasBZRead = requires(T & t, BZFILE *bzf) {
    { t.BZRead(bzf) } -> std::same_as<int>;
  };
 
  //--------------------------------------------------------------------------
  //--------------------------------------------------------------------------
  template <typename T>
  concept HasBZWrite = requires(const T & t, BZFILE *bzf) {
    { ((const T)t).BZWrite(bzf) } -> std::same_as<int>;
  };
  
  //--------------------------------------------------------------------------
  //--------------------------------------------------------------------------
  class BZ2Readable
  {
  public:
    virtual ~BZ2Readable() { }
 
    //------------------------------------------------------------------------
    //------------------------------------------------------------------------
    virtual int BZRead(BZFILE *bzf) = 0;
  };
 
  //--------------------------------------------------------------------------
  //--------------------------------------------------------------------------
  class BZ2Writable
  {
  public:
    virtual ~BZ2Writable() { }
 
    //------------------------------------------------------------------------
    //------------------------------------------------------------------------
    virtual int BZWrite(BZFILE *bzf) const = 0;
  };
  
  //--------------------------------------------------------------------------
  //--------------------------------------------------------------------------
  class BZ2IOCapable
    : public BZ2Readable, public BZ2Writable
  {};
  
}  // namespace Dwm
 
#endif  // _DWMBZ2IOCAPABLE_HH_
 
 
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