std::vector sure is great, hey?
I'm getting an EXC_BAD_ACCESS
in using push_back
to add an element, though. (I had a similar problem once, looked it up on SO, solved! Sadly, this appears to be a different issue.)
class BackgroundGroupsHandler {
public:
void addBeat(Beat *b);
vector<beat_display_group*> groups;
};
(Beat
is a simple struct-like class that carries some data around.)
class beat_display_group {
public:
void draw_me(float, float, float, int);
beat_display_group(int rhythmInt, int beatNumber);
~beat_display_group();
int posy;
private:
int rhythmInt;
int beatNumber;
int posx;
};
(beat_display_group
crunches some numbers to put each group in the right place on the screen.)
class BackgroundGroupsHandler {
public:
void addBeat(Beat *b);
vector<beat_display_group*> groups;
};
void BackgroundGroupsHandler::addBeat(Beat *b) {
beat_display_group *c = new beat_display_group(b->rhythmInt);
// EXC_BAD_ACCCESS ON THIS LINE:
groups.push_back(c);
}
sometimes gdb
takes me to stl_vector.h
:
// [23.2.4.2] capacity
/** Returns the number of elements in the %vector. */
size_type
size() const
{ return size_type(this->_M_impl._M_finish - this->_M_impl._M_start); }
and other times new_allocator.h
:
// _GLIBCXX_RESOLVE_LIB_DEFECTS
// 402. wrong new expression in [some_] allocator::construct
void
construct(pointer __p, const _Tp& __val)
{ ::new(__p) _Tp(__val); }
void
destroy(pointer __p) { __p->~_Tp(); }
The problem is most likely that the BackgroundGroupsHandler
that you are calling addBeat
on is NULL
or otherwise an invalid pointer. The problem shows up in the std::vector
code because you are using groups
, which will be invalid due to the BackgroundGroupsHandler
being invalid.
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