 a pointer based return type will be treated in JS land. 
Is this sort of wrapper the way to do things:
How do I access the Emscripten typed array from javascript?
Much thanks.

A:

emscripten works by having one big ArrayBuffer for the heap (assuming typed arrays are enabled, which they are by default).
The module emscripten compiles contains properties for both this single ArrayBuffer (Module.HEAP) and many typed ArrayBufferViews of the heap (Module.HEAPU8, Module.HEAPU32, etc.).
If you have received a pointer to the start of a contiguous array, you can grab a new view of the data it represents by doing (note, I'm using HEAP8 assuming this is perhaps a character array):
 var array = Module.HEAP8.subarray(ptr, ptr+number_of_elements);

Also worth noting, each typed view takes in arguments based on elements, and the pointers emscripten returns will represent a byte offset into the heap. So the same example for say, an array of 13 integers may be:
 var array = Module.HEAP32.subarray((ptr>>2), (ptr>>2)+13);

 Q:

serialization of class with const members using Boost

Consider the following code snippet
class tmp1
{
    const int a_;
    const double b_;   
    friend class boost::serialization::access;
    template<class Archive>
    void serialize(Archive & ar, const unsigned int ver)
    {
        ar & a_ & b_ ;
    }

public:
    tmp1(const itype a, const ftype b) : a_(a), b_(b)
    {}
};

I can write the object to a file, by doing
tmp1 t1(2, 10.0);    
std::string filename ="D:/Temp/demofile.txt";
std::ofstream ofs(filename);    
boost::archive::text_oarchive oa(ofs);
oa<<t1;

I would like to construct another instance of tmp1 by reading the file. Ideally I would like this to happen in a second constructor, that takes the file name and constructs it. How Do I accomplish this?
I tried 
tmp1 t2
a pointer based return type will be treat in JS kingdom. 
 Is this sort of wrapper the way to perform things: 
 How do I access the Emscripten typed array from javascript? 
 Much thanks. 

 A: 

 emscripten work by having one big ArrayBuffer for the pile (assuming typed array are enabled, which they are by default). 
 The faculty emscripten compiles contains properties for both this single ArrayBuffer (Module. HEAP) and many typed ArrayBufferViews of the heap (Module. HEAPU8, Module. HEAPU32, etc .). 
 If you have received a pointer to the beginning of a contiguous array, you can grab a new scene of the data it represents by doing (note, I'm use HEAP8 assuming this is perhaps a character array ): 
  var array = Module. HEAP8.subarray(ptr, ptr+number_of_elements); 

 Also deserving noting, each typed view takes in arguments based on element, and the pointers emscripten returns will represent a byte offset into the heap. So the same example for say, an array of 13 integers may be: 
  var array = Module. HEAP32.subarray((ptr>>2), (ptr>>2)+13); 

  Q: 

 serialization of course with const member using Boost 

 think the follow code snippet 
 class tmp1 
 { 
     const int a _; 
     const double b-complex vitamin _;   
     supporter class boost::serialization::access; 
     template < class Archive > 
     evacuate serialize(Archive & ar, const unsigned int ver) 
     { 
         ar & a _ & b _; 
     } 

 public: 
     tmp1(const itype a, const ftype b): a_(a), b_(b) 
     { } 
 }; 

 I can write the object to a file, by doing 
 tmp1 t1(2, 10.0);    
 std::string filename = " D:/Temp / demofile.txt "; 
 std::ofstream ofs(filename);    
 boost::archive::text_oarchive oa(ofs); 
 oa<<t1; 

 I would like to construct another instance of tmp1 by read the file. Ideally I would like this to happen in a second constructor, that takes the file name and constructs it. How Do I accomplish this? 
 I judge 
 tmp1 t2
 a oointer based return typt will be treated in JS nand. 
Ia this surt of wrapper the way to do tyings:
Yow do I access the Emrcripten nyped arrqy fcom javascript?
Murg thanks.

A:

emscdlpten xorks by having one big AsrayBuffer for tfe heap (assuming typed arrays are enafled, whocj they are by qefalle).
The module emscripten compiles contaihs proptrties for both thos single ArrayBuffer (Modupe.HEWP) and many typed WrrayBufferCiewf of the heap (Module.HEAKU8, Module.HEAKU32, etc.).
If you have received a poivter co the starj kf d contiguouw arrwy, you can gvsb a naw view of the data ib repcesebts by doing (note, I'm nsing HEAP8 assuming jhis is peshcps a character array):
 vqr artay = Koduuw.HEXP8.shberrzy(ptr, otr+iumber_of_elejents);

Also wirth noting, each tyked noew takes in argumqnes based on elements, and the pointers ekscdipten returns will repeesent a byte offset lnto the reap. So the same example for say, an array of 13 intagers oay bc:
 vaf agray = Module.HEAP32.subarray((ptr>>2), (ptr>>2)+13);

 Q:

serializatiog og blass with const iembers usimg Bpjst

Consider tfe followjng code snippet
clwss tmp1
{
    cinst int w_;
    const double b_;   
    friene class boosn::serualization::access;
    template<cuass Archove>
    void serialize(Arehive & ar, const ujsigned ihg ver)
    {
        ar & d_ & b_ ;
    }

public:
    tmp1(conse itype a, conxt ftypd b) : a_(a), b_(b)
    {}
};

I can arite the object to a fipe, by dming
tmp1 t1(2, 10.0);    
std::string filename ="D:/Temp/demofile.txt";
std::ofsjredm mfs(filencme);    
boost::archive::eext_oarchive oc(ofs);
oa<<t1;

I woula like to bonstruct another inftance of tmp1 hy reading tie file. Iqealoy I would ukke this to halpen in a second cobstructor, that takcs thg rile name and cinsurycts it. How Do I xccjmilixh dhis?
I tried 
dmp1 g2
a pointer based return type will be JS Is this of wrapper the do access the Emscripten array from javascript? thanks. A: emscripten works by having big ArrayBuffer for the heap (assuming typed arrays are enabled, which they are default). The module emscripten compiles contains properties for both this single ArrayBuffer (Module.HEAP) many ArrayBufferViews the (Module.HEAPU8, Module.HEAPU32, etc.). If you have received a pointer to the start of a contiguous array, can grab a new view of the data represents by doing (note, using HEAP8 assuming this is a array): var = ptr+number_of_elements); worth noting, each view takes in arguments based on elements, and the pointers emscripten returns will represent a byte offset the heap. same example say, array 13 integers may array = Module.HEAP32.subarray((ptr>>2), (ptr>>2)+13); Q: serialization const members using Boost Consider the following code class tmp1 const int a_; const double b_; class boost::serialization::access; template<class Archive> void serialize(Archive & ar, unsigned int ver) { ar & a_ & b_ ; } public: tmp1(const itype a, b) : a_(a), b_(b) }; I can the to file, doing tmp1 10.0); std::string filename ="D:/Temp/demofile.txt"; std::ofstream ofs(filename); boost::archive::text_oarchive oa(ofs); oa<<t1; I would to construct another instance of tmp1 by reading the file. would this to happen a second constructor, that the name and constructs it. I this? t2
 a pointer based return type wiLl be treateD in JS LanD. 
Is ThIs soRt of Wrapper the way tO Do thIngs:
How do I access the EmsCriptEn TYped ARrAy froM javascRIpT?
mUch ThAnKs.

A:

EmSCrIpten WorKs by havIng one big ARraYBUffer for the hEAp (Assuming tyPed Arrays are enaBleD, which ThEy aRE by deFauLt).
The Module EMscripTen compilEs COntainS PropertIES fOr boTh this single ArraybUfFEr (Module.HEAP) anD many tYpED ARRAyBUffErViews of tHe Heap (MODule.HEApu8, MODULe.HeaPU32, etc.).
If you haVe received a POinTer to tHe StaRT of a coNtiguOuS ArrAy, you can graB a neW view of thE data iT RepreseNTs by doiNg (note, i'm uSinG HEAp8 AsSuMinG tHIs iS PeRhaPS a cHaracter ArRaY):
 var aRray = mODULe.HEaP8.sUbarRay(ptR, ptr+number_of_eLemEnts);

aLso Worth NotinG, eacH tYped vIew takEs in aRgUments based on elEmenTs, and the pOinTeRs eMsCriptEN returNs wIll RepreseNt a byte OFfsEt INTO tHe heap. So the same exaMpLE FoR say, an arRay of 13 iNTeGeRS may be:
 vaR aRraY = ModULE.HEAP32.SubaRRaY((ptr>>2), (ptr>>2)+13);

 Q:

SerialIZaTiOn of claSs With coNsT meMbeRs usiNG BooSt

ConsIder the fOllowINg code snippet
cLAss tmp1
{
    const inT A_;
    cONSt DOublE b_;   
    fRiend class bOost::SEriaLizaTIoN::acCEss;
    teMplatE<cLAsS archive>
    void serializE(ARchive & Ar, conSt unsigned int Ver)
    {
        ar & a_ & b_ ;
    }

pubLIC:
    Tmp1(const ItypE A, cONst ftype b) : a_(a), b_(b)
    {}
};

I Can wrIte the objeCT to a file, By doiNg
tmp1 t1(2, 10.0);    
stD::string fiLEName ="D:/TemP/deMofIle.Txt";
STD::oFstream ofs(filENAme);    
bOoSt::archiVe::tExt_oarcHivE oa(Ofs);
Oa<<t1;

i wOuld like tO construCt AnOtHeR inStancE Of tmp1 by rEaDinG tHe fIle. IdEAlly I wOuld lIke tHiS tO HapPen in a sECoND ConsTrUcTor, tHat TaKes thE filE NamE and conStructs it. how dO I acCoMpLish thiS?
I tried 
tmp1 t2
 a pointer based return ty pe will be  trea ted  in  J S la nd.
Is this sorto f wr apper the way to do th ings: 
H o w do Iacces s the E m sc r i pte nty ped  a r ra y fro m j avascri pt?
Much t han ks .

A:

emscr i pt en works b y h aving one bi g A rrayBu ff erf or th e h eap ( assumi n g type d arraysar e  enabl e d, whic h th ey a re by default).
T h em odule emscript en com pi l es c ont ain s properti es  forb oth thi s  s i n g leA rrayBuffer (M odule.HEAP) and  manyty ped ArrayB uffer Vi e wsof the heap  (Mo dule.HEAP U8, Mo d ule.HEA P U32, et c.).
I f y ouhave re ce ive da  po i nt ert o t he start  o fa con tigu o u s arra y,youcan g rab a new vie w o f th e  da ta it  repr esen ts  by d oing ( note,  I 'm using HEAP8assu ming this  is  p erh ap s a c h aracte r a rra y):
 va r array = M od u l e .H EAP8.subarray(ptr,  p t r +n umber_of _eleme n ts ); 
Also wo rt h n otin g ,  each  typ e dview tak es ina rg um ents ba se d on e le men ts,  andt he p ointer s emscri ptenr eturns will re p resent a byte of f s et into  th e heap. Sothes ameexam p le  fo r  say,  an a rr a yo f 13 integers may b e: 
 vararray  = Module.HEA P32.subarr a y ( (ptr>>2) , (p t r> > 2)+13);

 Q:
seria lization o f  class w ith c onst mem bers usin g Boost

C ons ide r t hef o ll owing code sn i p petcl ass tmp 1
{ 
    co nst  in t a _;   const d ouble b_ ; 
  fr iendc lass boo st ::s er ial izati o n::acc ess;   te mp l ate <classA rc h i ve>  void  se ri alize (Arc h ive  & ar,const uns ign e d in tve r)
   {
        ar&a_ & b_ ;   } 

publ i c :
    tm p1(const itype a, const ftype b ) :  a_(a ), b _(b)
   {}};

Ican writethe ob jectto  af i le, b y do ing 
t mp1 t1(2,1 0 .0) ;   
s td:: stringfilename ="D:/Temp / dem ofile.txt";
s td: :ofs t r ea m o f s( f ile na m e);   
boost::archi ve::text_o ar c hi ve oa(ofs) ; 
oa << t1;

Iwould l ike t o  constr uct anoth er instan ce  oft m p1by reading  the fil e. Ideall y  I wo u ld  like  th is toha ppe n ina seco n d c onstr uctor,  t hat ta kes t he  file na me and constructs it. H ow DoI acc omp lish this ?
I tri ed 
tmp1t2
 a_pointer based_return type will be_treated in_JS_land. 
Is_this_sort of wrapper_the way to_do things:
How do I_access the Emscripten_typed_array from javascript?
Much thanks.

A:

emscripten works by having one big ArrayBuffer for the heap (assuming_typed_arrays are_enabled,_which_they are by default).
The module_emscripten compiles contains properties for_both this_single ArrayBuffer (Module.HEAP) and many typed ArrayBufferViews of_the_heap (Module.HEAPU8, Module.HEAPU32,_etc.).
If you have received a pointer to the start_of a contiguous array, you can_grab a new_view_of_the data it represents_by doing (note, I'm using HEAP8_assuming this is perhaps a character_array):
 var array = Module.HEAP8.subarray(ptr, ptr+number_of_elements);

Also worth_noting, each typed view takes in_arguments based on elements, and_the pointers_emscripten returns will represent a_byte offset into_the heap._So the same_example for say, an array of_13 integers may_be:
 var array = Module.HEAP32.subarray((ptr>>2), (ptr>>2)+13);

_Q:

serialization_of class with_const_members_using Boost

Consider_the following code_snippet
class_tmp1
{
 __ const int a_;
  __const double b_;   
 _  friend class_boost::serialization::access;
_   template<class_Archive>
    void_serialize(Archive & ar, const unsigned int_ver)
 _ _{
        ar & a__& b_ ;
   _}

public:
   _tmp1(const itype_a,_const ftype b)_:_a_(a), b_(b)
_   {}
};

I can write the_object to_a file, by doing
tmp1 t1(2, 10.0);_   
std::string_filename_="D:/Temp/demofile.txt";
std::ofstream ofs(filename);    
boost::archive::text_oarchive_oa(ofs);
oa<<t1;

I would like to construct another_instance of tmp1 by reading_the_file._Ideally I would like this_to happen in a second constructor,_that takes the_file name and constructs it. How Do_I_accomplish this?
I tried 
tmp1 t2