Re: [Dev-C++] Loading variables from files [C++]

But remember that you may quite often want to make the serialize a lot
more advanced, with versioning information.

Serialize is best when the same version of an application on the same
architecture will load a saved state.

Life may quickly get complicated if moving between different
architectures. If you write a 32-bit int and the other program expects
an int to be 64 bits large, the serialize will fail.

Another thing is when a new version have added more state information in
the class. It is quite probable that the end user expects a new version of
an application to be able to continue using the existing state
information.

I often make the serialize methods use text format (together with a bit of
glue helper functions) to make the serialize a bit more forgiving. It is
also possible to use binary formats. It's just a question about how to
handle potential overflows, and to make sure that missing/invalid fields
gets reasonable defaults.

/pwm

On Mon, 28 Apr 2008, Derek Clarke wrote:

> A good way is to add serialise operators to the class:
>
> ostream& hero::operator>>(ostream& stream)
> {
>   mapid >> stream;
>   posx >> stream;
>   posy >> stream;
>   return stream;
> }
>
> istream& hero::operator <<(istream& stream)
> {
>   mapid << stream:
>   posx << stream;
>   posy << stream;
>   return stream;
> }
>
> On Mon, Apr 28, 2008 at 6:40 AM, Samuel Hulley <tal...@gm...> wrote:
> > Hi,
> >     I am attempting to load variables from files but im not sure what
> >  todo because the variables are different types and sizes.
> >  Here is the source:
> >
> >  #pragma once
> >  #include <fstream>
> >  using namespace std;
> >
> >  class hero
> >  {
> >      public:
> >           void setname(string first, string last)
> >           {
> >                fname = first;
> >                lname = last;
> >                return;
> >           }
> >
> >           void setmap(int mp)
> >           {
> >                mapid = mp;
> >                return;
> >           }
> >
> >           void setpos(int x, int y)
> >           {
> >                posx = x;
> >                posy = y;
> >                return;
> >           }
> >
> >           void setmapx(int x)
> >           {
> >                posx = x;
> >                return;
> >           }
> >
> >           void setmapy(int y)
> >           {
> >                posy = y;
> >                return;
> >           }
> >
> >           int getmap()
> >           {
> >                return mapid;
> >           }
> >
> >           int getmapx()
> >           {
> >                return posx;
> >           }
> >
> >           int getmapy()
> >           {
> >                return posy;
> >           }
> >
> >           void loadinfo()
> >           {
> >                // This is where I will load the config.
> >           }
> >
> >      private:
> >           // Map variables.
> >           int mapid;
> >           int posx;
> >           int posy;
> >  };
> >
> >  Yours Truly
> >  Samuel Hulley.
> >
> >  -------------------------------------------------------------------------
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