Re: STL set inside inside a class
Re: STL set inside inside a class
- Subject: Re: STL set inside inside a class
- From: Paul Forgey <email@hidden>
- Date: Wed, 17 May 2006 15:41:49 -0700
What you are doing seems fine. Maybe you invoked
GenericTree::CalcDepthRecursive with a bogus this pointer? Quite
often unexplained crashes in member variables' class methods can be
traced back to the original class instance being invalid.
The rest is off topic but it will make your life easier..
You don't need to first check if a map member is already there before
doing the ++. The operator[] will insert a default value for the
type at the key if it doesn't exist and then return a reference to
it. That means depthCount[depth]++ will always do what you expect
since the default instantiation of a simple scaler type is 0.
Also if you use typedefs:
class GenericTree {
..
typedef std::map< const int, UInt16 > depthcount_type;
..
depthcount_type depthCount;
..
};
Then you don't have to keep saying std::map< const int, UInt16
>::whatever_type all the time.
On May 17, 2006, at 2:48 PM, mark wrote:
Hello.
I have a class with a set defined in it.
class GenericTree {
TreeObjectRef *toBlock; // 0 is usually the root
UInt16 refCount;
UInt16 maxItems;
void* root;
UInt16 itemCount;
std::map<const int, UInt16> depthCount; // number of
objects at depth X
...
}
And a method in the class
void GenericTree::CalcDepthRecursive(SInt16 index, SInt16 depth) {
UInt16 t;
if (depth>maxDepth) {return;}
...
std::map<const int, UInt16>::iterator end=depthCount.end();
if (depthCount.find(depth)!=end) {
depthCount[depth]++;
}
else {
depthCount[depth]=1; (1)
}
...
};
}
(1) causes an EXC_BAD_ACCESS somewhere deep inside the bowels of set.
If the depthCount is not in a class, it works fine,
operator--()
{
_M_node = _Rb_tree_decrement(_M_node); <<< here
return *this;
}
Is this an implementation issue for set or doesn't set like living
inside a class?
I have only started using STL receently.
XCode 2.2.1, OS 10.4.6
TIA
Mark
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