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EpetraExt_PackTraits.h
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00004 //     EpetraExt: Epetra Extended - Linear Algebra Services Package
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00040 //@HEADER
00041 #ifndef EPETRAEXT_PACKTRAITS_H
00042 #define EPETRAEXT_PACKTRAITS_H
00043 
00044 // ---------- Standard Includes ----------
00045 
00046 #include <string>
00047 #include <vector>
00048 
00049 // ----------   Xyce Includes   ----------
00050 
00051 // ----------  Other Includes   ----------
00052 
00053 // ----------  Fwd Declarations ----------
00054 
00055 namespace EpetraExt {
00056 
00061 template <typename T>
00062 struct PackTraits
00063 {
00070   static size_t size( T const & object )
00071   { return object.packedByteCount(); }
00072 
00080   static void pack( T const & object, char * buf, size_t size, int & pos )
00081   { object.pack( buf, size, pos ); }
00082 
00090   static void unpack( T & object, char * buf, size_t size, int & pos )
00091   { object.unpack( buf, size, pos ); }
00092 };
00093 
00095 
00097 template <>
00098 struct PackTraits<std::string>
00099 {
00100   static size_t size( std::string const & object )
00101   { return object.length() + sizeof(size_t); }
00102 
00103   static void pack( std::string const & object, char * buf, size_t size, int & pos )
00104   {
00105     size_t len = object.length();
00106     std::memcpy( buf+pos, &len, sizeof(size_t) );
00107     pos += sizeof(size_t);
00108     std::memcpy( buf+pos, object.c_str(), len );
00109     pos += len;
00110   }
00111 
00112   static void unpack( std::string & object, char * buf, size_t size, int & pos )
00113   {
00114     size_t len;
00115     std::memcpy( &len, buf+pos, sizeof(size_t) );
00116     pos += sizeof(size_t);
00117     object = std::string( buf+pos, len );
00118     pos += len;
00119   }
00120 };
00121 
00123 
00126 template <typename T>
00127 struct PackTraits< std::vector<T> >
00128 {
00129   static size_t size( std::vector<T> const & object )
00130   { return object.size() * sizeof(T) + sizeof(size_t); }
00131 
00132   static void pack( std::vector<T> const & object, char * buf, size_t size, int & os )
00133   {
00134     size_t len = object.size();
00135     std::memcpy( buf+pos, &len, sizeof(size_t) );
00136     pos += sizeof(size_t);
00137     std::memcpy( buf+pos, &object[0], len*sizeof(T) );
00138     pos += len*sizeof(T);
00139   }
00140 
00141   static void unpack( std::vector<T> & object, char * buf, int size, int & pos )
00142   {
00143     size_t len;
00144     std::memcpy( &len, buf+pos, sizeof(size_t) );
00145     pos += sizeof(size_t);
00146     object.resize(len);
00147     std::memcpy( &object[0], buf+pos, len*sizeof(T) );
00148     pos += len*sizeof(T);
00149   }
00150 };
00151 
00152 } //namespace EpetraExt
00153 
00154 #endif
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