Re: [Boost-users] Memory mapped files

Subject: Re: [Boost-users] Memory mapped files
From: Simon Giddings (simon.giddings_at_[hidden])
Date: 2019-01-23 08:19:14

We have already taken into account the problem of pointers and also 
endian ordering.
When doing a hex dump of the files produced under unix and one produced 
under android, using the same data content, we have noticed that there 
are byte differences.
So, other than doing a "memory dump", is it possible to get Boost to 
serialise the data out to disk ?

On 23/01/2019 01:46, Gavin Lambert via Boost-users wrote:
> On 21/01/2019 22:41, Simon Giddings wrote:
>> We are developing a system which heavily uses memory mapped files.
>> These files are initially created under a unix system, but will then 
>> be used in portable systems such as Android and iOS.
>> We are having some problems loading memory mapped files created under 
>> Unix into Android.
>
> In what context?  Using some Boost library or in general?
>
>> Is this scenario even possible ?
>> Are the memory mapped files compatible between systems ?
>
> They can be, but are not guaranteed to be, depending on what you're 
> storing in the memory.
>
> Binary layout of class types is usually not guaranteed cross-platform 
> (or cross-compiler, for that matter).
>
> Anything involving pointers usually won't work at all, even 
> cross-process or cross-session, let alone cross-platform.
>
> You can also have issues with padding or value endian ordering, 
> depending on the specific platforms involved.
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