[LLVMbugs] [Bug 22352] New: single-element initializer_list and overload resolution

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=22352

            Bug ID: 22352
           Summary: single-element initializer_list and overload
                    resolution
           Product: clang
           Version: trunk
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: C++11
          Assignee: unassignedclangbugs at nondot.org
          Reporter: mikhail.strelnikov at gmail.com
                CC: dgregor at apple.com, llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Hello!

Following code compiles successfully with clang (because it does not invoke 2nd
constructor), while gcc fails (on static_assert, trying to actually call 2nd
constructor).

#include <initializer_list>
#include <cstdio>

template<typename T>
class II
{
public:
    II(std::initializer_list<int> l1)
    {
        printf("one list\n");
    }
    II(std::initializer_list<int> l1, std::initializer_list<int> l2)
    {
        static_assert(sizeof(T) == 0, "");
        printf("two lists\n");
    }
};

int main()
{
    II<int> i1{ { 1 }, { 2 } };
    II<int> i2{ { { 1 } }, { { 2 } } };

    return 0;
}

If clang's behaviour is correct, how do I call 2nd constructor (assuming that I
need to call it with single-element list)?

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