EpetraExt_PackTraits.h

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//     EpetraExt: Epetra Extended - Linear Algebra Services Package
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#ifndef EPETRAEXT_PACKTRAITS_H
#define EPETRAEXT_PACKTRAITS_H
 
// ---------- Standard Includes ----------
 
#include <string>
#include <vector>
 
// ----------   Xyce Includes   ----------
 
// ----------  Other Includes   ----------
 
// ----------  Fwd Declarations ----------
 
namespace EpetraExt {

template <typename T>
struct PackTraits
{
  static size_t size( T const & object )
  { return object.packedByteCount(); }

  static void pack( T const & object, char * buf, size_t size, int & pos )
  { object.pack( buf, size, pos ); }

  static void unpack( T & object, char * buf, size_t size, int & pos )
  { object.unpack( buf, size, pos ); }
};


template <>
struct PackTraits<std::string>
{
  static size_t size( std::string const & object )
  { return object.length() + sizeof(size_t); }
 
  static void pack( std::string const & object, char * buf, size_t size, int & pos )
  {
    size_t len = object.length();
    std::memcpy( buf+pos, &len, sizeof(size_t) );
    pos += sizeof(size_t);
    std::memcpy( buf+pos, object.c_str(), len );
    pos += len;
  }
 
  static void unpack( std::string & object, char * buf, size_t size, int & pos )
  {
    size_t len;
    std::memcpy( &len, buf+pos, sizeof(size_t) );
    pos += sizeof(size_t);
    object = std::string( buf+pos, len );
    pos += len;
  }
};


template <typename T>
struct PackTraits< std::vector<T> >
{
  static size_t size( std::vector<T> const & object )
  { return object.size() * sizeof(T) + sizeof(size_t); }
 
  static void pack( std::vector<T> const & object, char * buf, size_t size, int & os )
  {
    size_t len = object.size();
    std::memcpy( buf+pos, &len, sizeof(size_t) );
    pos += sizeof(size_t);
    std::memcpy( buf+pos, &object[0], len*sizeof(T) );
    pos += len*sizeof(T);
  }
 
  static void unpack( std::vector<T> & object, char * buf, int size, int & pos )
  {
    size_t len;
    std::memcpy( &len, buf+pos, sizeof(size_t) );
    pos += sizeof(size_t);
    object.resize(len);
    std::memcpy( &object[0], buf+pos, len*sizeof(T) );
    pos += len*sizeof(T);
  }
};
 
} //namespace EpetraExt
 
#endif