Op 7-3-2013 10:24, pengliang(??) schreef:
Hi All
QMultiHash<Qstring,int>hh;
I need to find some key and change their values.
I found If I use QmutableHashIterator<Qstring,int>it , its
bool
*findNext <qmutablehashiterator.html#findNext>*( const T &/value/)
Its parameter is a value, not a key.
So I need to :
While(it.hasNext())
{
It.next();
If(it.key() == ikey)
{
It.setValue(ivalue);
}
}
I must to check every item? Who have a better method?
2. Qhash:
Some books said Qhash is unorderred?
But I test it.
Qhash<Qstring,int>hh;
I insert some string, and loop the hash by QhashIterator, I found the
string is orderred.
And I test it Qhash<int,Qstring>, and print key, and found they still
orderred.
Why books said it is unorderred?
Well, it is not unordered, and I doubt that that is what the book
actually said. However, the order is undefined. Qt just makes no
guarantee whatsoever about the order of the items. Not even that it is
the same for the same types used between different compilers,between
debug and release builds, between different platforms, between Qt
versions or even between runs.
So, even if it looks ordered to you now or it perhaps really is
perfectly ordered, there is no way for you to know that it will stay
that way.
André
--
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I am looking for collegues to join me at i-Optics!
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