Hmmm - have you read the documenaton on BOOST_SERIALIZATION_STRONGTYPEDEF? If it's not clear let me know. I don't remember much about other than no one has ever complained about it. Robert Ramey Jack Bryan wrote:
thanks,
In this way, in myClass, I replace " double* myDouble" with " serializable_double myDouble". Can the " myDouble " be accessed as the original " double* " ?
I need to assign some values to myDouble at first and then use boost MPI to transfer it to another process.
For example,
if I use double*
double myVar =2.1 ; double* myDouble = &myVar ;
if I use serializable_double , I need to do it in this way :
double myVar = 2.1 ; serializable_double myDouble = &myVar ;
If I am wrong, please correct me.
The following is the data structure that I want to transfer from one process to another process : -------------------------------------------------------------------------------
typedef struct { int rank; double constr_violation; double *xreal; int **gene; double *xbin; double *obj; double *constr; double crowd_dist;
} individual;
typedef struct { individual *ind; } population; -----------------------------------------------------------------------------------
I need to trasfer population from process 1 to process 2 such that the data members in population->ind can be operated in process 2.
Then, the process 2 returns the population->ind with new results to process 1.
Becasue the population and individual data structure are also used by other programs in the same project, I do not want to change double8 to serializable_double inside them.
May I use assignment to do it ?
for example,
myClass {
int rank; double constr_violation; serializable_double xreal; serializable_int *gene; serializable_double xbin; serializable_double obj; serializable_double constr; double crowd_dist; } myObject;
myObject.xreal = (population->ind)->xreal;
Any help is appreciated.
thanks
Jack
Aug. 29 2010
To: boost-users@lists.boost.org From: ramey@rrsd.com Date: Sun, 29 Aug 2010 10:27:57 -0800 Subject: Re: [Boost-users] boost transfer pointers by serialize
Jack Bryan wrote:
Thanks
Is the m_sd a pointer that points to a double variable ?
no
How to refer to the values pointed by m_sd ?
if you use BOOST_SERIALIZE_STRONG_TYPEDEF then the serializable_double can be handled exactly like a double. (note: this is the way it is for integer types. As I write this I'm not sure it applies to floating point types but I think it does.
think of strong typedef as the same as a typedef except that it actually creates a new identifiable type.
For example, I transfer myClass from process 1 to process 2 :
In process 1, I declear
myClass { serializable_double m_sd;
serializable_int m_sint;
template<class Archive> void serialize(Archive &ar, const unsigned int version){ ar & m_sd & m_sint;; } } myObject;
so far so good.
In process 1 , I use
world.isend(destRank, downStreamTaskTag, myObject);
In process 2, I use
world.recv(sourceRank, downStreamTaskTag, myObjectRecv);
How to refer to the values pointed by m_sd in myClass ?
just like you would doubles.
May I use it in this way ?
*(myObjectRecv.m_sd) ;
you could.
If myObjectRecv.m_sd is an address of a primitive variable, the address should be in process 1's memory space.
How does the process 2 can modify the value of the variable pointed by a pointer with address in process 1's memory space ?
no it will be in the address space of the process that does the de-serialization.
I can use the similar way to do it for pointer's pointer ? such as double** ?
unfortunately, pointers to pointers are not currently serializable. There is a track item on this. This is an oversight in the implementation which is non-trivial to fix.
Any help is appreciated ?
it is?
Robert Ramey
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