somehow I think pointers are the way to go when modifying an iterator function
argument. but I am having problems. I have a pointer to an iterator.
gcc wants me to dereference a *third* time. it says to use -> and I know a->b
is the same as *a.b
but gcc doesn't see it this way I guess. or again I am not understanding
something.
I already trieddoing *iSpecEl->tagName and this does not work. it gives me an
error.
EVERYTHING I have tried gives me an error.
how can this be? I know you dereference iterators using * and same with
pointers. so I had to (I thought) do a double dereference here. here is latest
code:
typedef struct SBraceNode {
int64_t lineNumber, columnNumber;
uint32_t ch;
} SBraceNode;
typedef struct {
std::string
name,
val;
bool isBoolean;
VUI hitLineNumbers;
} SAttribute;
typedef std::list<SAttribute> LSA;
typedef std::list<SAttribute>::iterator LSAI;
typedef std::list<std::string> LS;
typedef std::list<std::string>::iterator LSI;
LSA lsGlobalIDs;
typedef std::vector<std::string> VS;
VS vsDoctypes;
typedef struct SElement {
std::string tagName;
bool isVoid; //void element/singleton
bool isScriptOrStyle; //for these, we ignore any opening and closing braces
and look for </script> tags
bool hasSlash;
SBraceNode
sbnOpenStart, //start of open tag
sbnOpenEnd, //end of open tag
sbnCloseStart,//start of close tag
sbnCloseEnd; //end of close tag
LS lsAttributes;
} SElement;
typedef std::vector<SElement> VSE;
typedef std::vector<SElement>::iterator VSEI;
bool attribNameIsInSpecElement(std::string tagName, std::string sattrib, VSEI*
piSpecEl, LSAI* piSpecAttrib, bool isXHTML, bool isXML) {
//*piSpecEl is the iterator for the spec element
//**piSpecEl is the element
//*piSpecAttrib is the iterator for the spec attribute
//**piSpecAttrib is the attribute
for (piSpecEl = &(vseSpecElements.begin());
*piSpecEl != vseSpecElements.end();
*piSpecEl++) {
if (compare(tagName,**piSpecEl.tagName,isXHTML,isXML)) {
for (piSpecAttrib = &(**piSpecEl.lsAttributes.begin());
*piSpecAttrib != **piSpecEl.lsAttributes.end();
*piSpecAttrib++) {
if (compare(**piSpecAttrib.name,sattrib,isXHTML,isXML)) {
//at this point, iAttrib and iSpecEl both point to valid
attribute and element.
return true;
}
}
}
}
//at this point, iSpecEl points to vseSpecElement.end() and iAttrib points
to lsAttributes.end()
return false;
}
I could not use *piSpecEl->tagName because this caused an error.
I can't use **piSpecEl.tagName because this causes an *error* in gcc and it
says "perhaps you wanted to use -> ?"
64\errgw64bmatch2:bmatch2.cpp:405:34: error: request for member 'tagName' in
'piSpecEl', which is of pointer type 'VSEI* {aka __gnu_cxx::__normal_iter
ator<SElement*, std::vector<SElement> >*}' (maybe you meant to use '->' ?)
64\errgw64bmatch2:bmatch2.cpp:406:37: error: request for member 'lsAttributes'
in 'piSpecEl', which is of pointer type 'VSEI* {aka __gnu_cxx::__normal
_iterator<SElement*, std::vector<SElement> >*}' (maybe you meant to use '->' ?)
64\errgw64bmatch2:bmatch2.cpp:407:36: error: request for member 'lsAttributes'
in 'piSpecEl', which is of pointer type 'VSEI* {aka __gnu_cxx::__normal
_iterator<SElement*, std::vector<SElement> >*}' (maybe you meant to use '->' ?)
64\errgw64bmatch2:bmatch2.cpp:409:32: error: request for member 'name' in
'piSpecAttrib', which is of pointer type 'LSAI* {aka std::_List_iterator<SAt
tribute>*}' (maybe you meant to use '->' ?)
>________________________________
> From: Ruben Van Boxem <[email protected]>
>To: [email protected]
>Sent: Monday, November 5, 2012 11:52 PM
>Subject: Re: [Mingw-w64-public] bug in gcc? has nothing defined for iterator
>references
>
>
>Op 6 nov. 2012 06:40 schreef "Jim Michaels" <[email protected]> het volgende:
>>
>> 32\errgw32bmatch2:bmatch2.cpp:404:49: error: no match for 'operator=' in
>> 'iSpecAttrib = (& iSpecEl)->__gnu_cxx::__normal_iterator<_Iterator,
>> _Container>::operator-><SElement*, std::vector<SElement>
>> >()->SElement::lsAttributes.std::list<_Tp,
>> _Alloc>::begin<std::basic_string<char>,
>> std::allocator<std::basic_string<char> > >()'
>>
>> 32\errgw32bmatch2:bmatch2.cpp:404:93: error: no match for 'operator!=' in
>> 'iSpecAttrib != (& iSpecEl)->__gnu_cxx::__normal_iterator<_Iterator,
>> _Container>::operator-><SElement*, std::vector<SElement>
>> >()->SElement::lsAttributes.std::list<_Tp,
>> _Alloc>::end<std::basic_string<char>, std::allocator<std::basic_string<char>
>> > >()'
>>
>> typedef struct {
>> std::string
>> name,
>> val;
>> bool isBoolean;
>> VUI hitLineNumbers;
>> } SAttribute;
>> typedef std::list<SAttribute> LSA;
>> typedef std::list<SAttribute>::iterator LSAI;
>>
>> bool attribNameIsInSpecElement(std::string tagName, std::string attrib,
>> VSEI& iSpecEl, LSAI& iSpecAttrib, bool isXHTML, bool isXML) {
>Why are you passing the iterator references into the function when you set
>them below anyway? Remove these function parameters, and make the variables
>local to their for loop.
>> for (iSpecEl=vseSpecElements.begin(); iSpecEl != vseSpecElements.end();
>> iSpecEl++) {
>> if (compare(tagName,iSpecEl->tagName,isXHTML,isXML)) {
>> for (iSpecAttrib=iSpecEl->lsAttributes.begin(); iSpecAttrib !=
>> iSpecEl->lsAttributes.end(); iSpecAttrib++) {
>>
>>
>> where it's having trouble is with assigning and equating to LSAI variables.
>> specifically last and first line of function nothing is defined as operators
>> for any iterator that's a reference.
>>
>> maybe there's something I am missing here. I wanted to modify the original
>> iSpecAttrib.
>> I don't know enough about iterators to figure out how to pass a value back
>> in an argument to the original variable in c++ now except to use pointers...
>> I really wanted to use references, they are SO much more convenient.
>It is idiomatic c++ to pass iterators by value, not by reference.
>Ruben
>>
>> -------------
>> Jim Michaels
>> [email protected]
>> [email protected]
>> http://RenewalComputerServices.com
>> http://JesusnJim.com (my personal site, has software)
>> ---
>> IEC Units: Computer RAM & SSD measurements, microsoft disk size measurements
>> (note: they will say GB or MB or KB or TB when it is IEC Units!):
>> [KiB] [MiB] [GiB] [TiB]
>> [2^10B=1,024^1B=1KiB]
>> [2^20B=1,024^2B=1,048,576B=1MiB]
>> [2^30B=1,024^3B=1,073,741,824B=1GiB]
>> [2^40B=1,024^4B=1,099,511,627,776B=1TiB]
>> [2^50B=1,024^5B=1,125,899,906,842,624B=1PiB]
>> SI Units: Hard disk industry disk size measurements:
>> [KB] [MB] [GB] [TB]
>> [10^3B=1,000B=1KB]
>> [10^6B=1,000,000B=1MB]
>> [10^9B=1,000,000,000B=1GB]
>> [10^12B=1,000,000,000,000B=1TB]
>> [10^15B=1,000,000,000,000,000B=1PB]
>>
>>
>> ------------------------------------------------------------------------------
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>> Stay in control, update software, and manage PCs from one command center
>> Diagnose problems and improve visibility into emerging IT issues
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>> _______________________________________________
>> Mingw-w64-public mailing list
>> [email protected]
>> https://lists.sourceforge.net/lists/listinfo/mingw-w64-public
>>
>------------------------------------------------------------------------------
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