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我試圖構建一個名爲Setop的類,該類提供set操作,包括交集,union等。所以我嘗試使用C++模板來實例化它。在Setop中,我使用QSet來存儲集合的元素。我的代碼如下所示:使用模板與QSet和Qt中的boost :: tuples :: tuple無匹配錯誤
setop.h
template <typename T> class SetOp {
public:
SetOp(std::vector<T> &_input);
void _union(SetOp<T> &_set2);
QSet<T> _intersection(SetOp<T> &_set2);
QSet<T> _diff(SetOp<T> &_set2);
QSet<T> _diff(QSet<T> &_set1,QSet<T> &_set2);
void outputElement();
QSet<T> getSet(){return mySet;}
std::vector<T> getVecFromQSet();
private:
QSet<T> mySet;
};
setop.cpp:
template <typename T> SetOp<T>::SetOp(std::vector<T> &_input)
{
for(int i = 0; i < (int)_input.size(); ++i)
mySet.insert(_input[i]);
}
這裏是我試過了,我傳遞的boost ::元組::使用模板類元組到Setop:
void MainWindow::setOp(std::vector<std::vector<boost::tuples::tuple<float,int,int,int> > > &_pointSet)
{
std::vector<std::vector<boost::tuples::tuple<float,int,int,int> > > merged;
while(!_pointSet.empty()) {
BOOST_AUTO(it,_pointSet.begin());
BOOST_AUTO(itn,_pointSet.begin() + 1);
SetOp<boost::tuples::tuple<float,int,int,int> > set1((*it)),set2((*itn));
for(; itn != _pointSet.end();) {
// SetOp<boost::tuples::tuple<float,int,int,int> > temp = set1;
// if(!temp._intersection(set2).isEmpty()) {
// set1._union(set2);
// itn = _pointSet.erase(itn);
// }
// else
// ++itn;
}
// merged.push_back(set1.getVecFromQSet());
}
}
編譯器生成以下錯誤:
c:\QtSDK\Desktop\Qt\4.8.1\mingw\include\QtCore\qhash.h:882: error:no matching function for call to 'qHash(const boost::tuples::tuple<float, int, int, int, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type>&)'
c:\QtSDK\Desktop\Qt\4.8.1\mingw\include\QtCore\qhash.h:225: error:no match for 'operator==' in 'key0 == ((QHashNode<boost::tuples::tuple<float, int, int, int, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type>, QHashDummyValue>*)this)->QHashNode<boost::tuples::tuple<float, int, int, int, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type, boost::tuples::null_type>, QHashDummyValue>::key'
這些錯誤意味着什麼以及如何糾正它們?
相關:http://stackoverflow.com/questions/9126470/how-to-write-qhash-for-a-qsetsomeclass-container –
@VaughnCato boost :: tuples :: tuple中有一個float值。對於浮點值很難實現operator ==,不是嗎? – user957121
不使用QSet,然後...使用std集合或boost集合。另外,爲什麼SetOp.intersection(SetOp)返回一個QSet?它有點不一致... – UmNyobe