I am trying to write a small algorithm that find the common and unique parts of two sets and I want to write it in a generic fashion so I have this little example:
#include "boost/tuple/tuple.hpp"
#include <set>
template <typename InputIt, typename Value = typename std::iterator_traits<InputIt>::value_type>
boost::tuple<std::set<Value>, std::set<Value>, std::set<Value>>
findUniqueAndCommon(InputIt fbegin, InputIt fend, InputIt sbegin, InputIt send)
{
std::set<Value> setL(fbegin, fend);
std::set<Value> setR(sbegin, send);
std::set<Value> uniqueInCatalog1;
std::set<Value> uniqueInCatalog2;
std::set<Value> commonInBoth;
std::set_difference(setL.begin(), setL.end(), setR.begin(), setR.end(), uniqueInCatalog1.begin());
std::set_difference(setR.begin(), setR.end(), setL.begin(), setL.end(), uniqueInCatalog2.begin());
std::set_intersection(setL.begin(), setL.end(), setR.begin(), setR.end(), commonInBoth.begin());
return{ uniqueInCatalog1, uniqueInCatalog2, commonInBoth };
}
int main()
{
std::set<int> x = {1, 2, 3};
std::set<int> y = {4, 2, 3};
findUniqueAndCommon<std::set<int>::iterator>(x.begin(), x.end(), y.begin(), y.end());
}
My question is that why does this function failed to compile? I tried gcc, clang and MSVC and they all fail. Clang's error message is can be inspected here http://ift.tt/2AGupOb
Thanks a lot.
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