I am getting the following error while migrating VC6 code to VS2008. This code works fine in VC6 but gives a compilation error in VC9. I know it is because of a compiler breaking change. What is the problem and how do I fix it?
error C2440: 'initializing' : cannot convert
from 'std::_Vector_iterator<_Ty,_Alloc>'
to 'STRUCT_MUX_NOTIFICATION *'
Code
MUX_NOTIFICATION_VECTOR::iterator MuxNotfnIterator;
for(
MuxNotfnIterator = m_MuxNotfnCache.m_MuxNotificationVector.begin();
MuxNotfnIterator != m_MuxNotfnCache.m_MuxNotificationVector.end();
MuxNotfnIterator ++
)
{
STRUCT_MUX_NOTIFICATION *pstMuxNotfn = MuxNotfnIterator; //Error 2440
}
If it worked before, I am guessing MUX_NOTIFICATION_VECTOR is a typedef
typedef std::vector<STRUCT_MUX_NOTIFICATION> MUX_NOTIFICATION_VECTOR;
The iterator for a container can often be mistaken with a pointer (because it works the same way) and, in the case of some stl implementations, it can actually be a pointer (it probably was the case with STL provided with VC6). But there is no guarantee about that.
What you should do is the following :
STRUCT_MUX_NOTIFICATION& reference = *MuxNotfnIterator;
// or
STRUCT_MUX_NOTIFICATION* pointer = &(*MuxNotfnIterator);
我认为这应该可以解决问题:
STRUCT_MUX_NOTIFICATION *pstMuxNotfn = &(*MuxNotfnIterator);
您需要取消对迭代器的引用,以获取适当的结构(不确定为什么以前可以工作?):
STRUCT_MUX_NOTIFICATION *pstMuxNotfn = *MuxNotfnIterator;
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