Error: Overloading ambiguity between "std::copy

Question

I have a code like below:

#include<set>
#include<iterator>

std::set<std::string> s1;
std::set<std::string> s2;   
std::set<std::string> myresult;

void some_func() {
    std::set_difference(s1.begin(), s1.end(), s2.begin(), s2.end(),std::inserter(myresult,myresult.begin()));
}

This gives me compilation error:

/export/SunStudio/SUNWspro/prod/include/CC/Cstd/./algorithm.cc", line 2161: Error: Overloading ambiguity between "std::copy<__rwstd::__rb_tree<std::string, std::string, __rwstd::__ident<std::string, std::string>, std::less<std::string>, std::allocator<std::string>>::const_iterator, std::insert_iterator<std::set<std::string>>>(__rwstd::__rb_tree<std::string, std::string, __rwstd::__ident<std::string, std::string>, std::less<std::string>, std::allocator<std::string>>::const_iterator, __rwstd::__rb_tree<std::string, std::string, __rwstd::__ident<std::string, std::string>, std::less<std::string>, std::allocator<std::string>>::const_iterator, std::insert_iterator<std::set<std::string>>)" and "copy<__rwstd::__rb_tree<std::string, std::string, __rwstd::__ident<std::string, std::string>, std::less<std::string>, std::allocator<std::string>>::const_iterator, std::insert_iterator<std::set<std::string>>>(__rwstd::__rb_tree<std::string, std::string, __rwstd::__ident<std::string, std::string>, std::less<std::string>, std::allocator<std::string>>::const_iterator, __rwstd::__rb_tree<std::string, std::string, __rwstd::__ident<std::string, std::string>, std::less<std::string>, std::allocator<std::string>>::const_iterator, std::insert_iterator<std::set<std::string>>)".

This must be specific to SunStudio: I just compiled your code with my C++ compiler on mac, and it compiled without a single warning . — Sergey Kalinichenko, Dec 26 '11 at 11:24
Could it be a compiler thing? My g++ 4.5.2 compiles your snippet just fine (I've added an `#include`). — Vlad, Dec 26 '11 at 11:28
@dasblinkenlight: Or perhaps your compiler has a problem specific to _it_ that makes the above code pass. ;) — Lightness Races in Orbit, Dec 26 '11 at 12:51
Apparently, it's a [very common problem](http://stackoverflow.com/questions/8634234/error-while-doing-set-difference-variable-result-is-not-a-structure) today. — vstm, Dec 26 '11 at 13:06

score 0 · Answer 1 · answered Jan 10 '12 at 12:44

0

You forgot to add

#include<algorithm>

to your code.

answered Jan 10 '12 at 12:44

Alexandr Priymak

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Error: Overloading ambiguity between "std::copy

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