c++ - std vector const_iterator assignment Access violation -


i'm working on code in 1 of more variable length object stored vector of units i.e. assuming each letter unit, , same letter same high level object. vector may contain following: aaaabbcccdeeffff...

this vector internal private variable of class has operator[] defined such vector above

 - obj[0] returns const_iterator first "a"  - obj[1] first "b"  - obj[2] first "c" etc.  const ai::genearray::const_iterator& ai::chromosome::operator[](int index) const {     genearray::const_iterator pgene;     int cindex;     (cindex=0,pgene = this->vgenes.cbegin();pgene != this->vgenes.cend();pgene++, cindex++) {         if (index == cindex) { break; }         (*pgene)->endofblock(pgene); }     return pgene; }

then in function have following

ai::genearray::const_iterator function = vchromosome[0];

this causes access violation error.

the call stack's above function follows

ai.exe!std::_vector_const_iterator<std::_vector_val<ai::gene *,std::allocator<ai::gene *> > >::_vector_const_iterator<std::_vector_val<ai::gene *,std::allocator<ai::gene *> > >(const std::_vector_const_iterator<std::_vector_val<ai::gene *,std::allocator<ai::gene *> > > & __that)  + 0x2f byte ai.exe!std::_iterator012<std::random_access_iterator_tag,ai::gene *,int,ai::gene * const *,ai::gene * const &,std::_iterator_base12>::_iterator012<std::random_access_iterator_tag,ai::gene *,int,ai::gene * const *,ai::gene * const &,std::_iterator_base12>(const std::_iterator012<std::random_access_iterator_tag,ai::gene *,int,ai::gene * const *,ai::gene * const &,std::_iterator_base12> & __that)  + 0x2f bytes ai.exe!std::_iterator_base12::_iterator_base12(const std::_iterator_base12 & _right)  line 118 ai.exe!std::_iterator_base12::operator=(const std::_iterator_base12 & _right)  line 123 + 0x5 bytes

the final call 

_iterator_base12& operator=(const _iterator_base12& _right)     {   // assign iterator         if (_myproxy != _right._myproxy)             _adopt(_right._myproxy->_mycont);<- line         return (*this);     }

according debugger (visual c++ 2010 express)

_right._myproxy->    _mycont = cxx0030: error: expression cannot evaluated    _myfirstiter = cxx0030: error: expression cannot evaluated

else in project have similar code using std::list, rather vector works correctly

parents = new chromosomelist::const_iterator[c]; *(parents) = --(this->vchromosomes.cend()); (int i=1;i<c;i++) {     *(parents+i) = chromosomelist::const_iterator((*(parents+i-1)));     (*(parents+i))--; }

i've checked value returned by

vchromosome[0]

this value of correct type,

const ai::genearray::const_iterator &

i've search google similar problems, i've been able find problem related looping through vector using iterator's

i.e.

for (ai::genearray::const_iterator pgene = genes.cbegin();pgene != genes.cend();pgene++)

such code in project working correctly.

ai::genearray::const_iterator function = vchromosome[0];

should not compile. function iterator, you're attempting set value of contents of value. sure did not want vchromosome.begin() instead?

assuming that's typo here, bug not @ point assignment happens, bug somewhere before that. vchromosome might empty, example, in case attempting access operator[](0) lead undefined behavior. (see if vector valid first!)

(side note,

parents = new chromosomelist::const_iterator[c];

why managing array manually? isn't vector for? :) )


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