Initializing a dynamic array of non-default constructible objects

Question

The code below:

struct Foo
{
    Foo(int){} // no default constructor
};

int main()
{
    Foo* pFoo = new Foo[2]{1,2}; // OK in g++, fails in clang++!
    delete[] pFoo;
}

compiles in gcc, but fails in clang. Is the code above syntactically correct?

Just when I thought we could trust our tools. I think you broke one of them. See, this is why we can't have nice compilers. — wally
– wally, Commented May 20, 2016 at 1:23
The code is syntactically correct: new Foo[2] may be followed by a brace-enclosed list. I guess you are actually asking whether it is well-formed — M.M
– M.M, Commented May 20, 2016 at 1:57
Looks like clang bug to me. The error messages from clang 3.8 are nonsense, e.g. "note: in implicit initialization of array element 2 with omitted initializer" — M.M
– M.M, Commented May 20, 2016 at 2:08
If you do actually provide a default constructor, clang doesn't call it — M.M
– M.M, Commented May 20, 2016 at 2:08
See llvm.org/bugs/show_bug.cgi?id=22924 and the discussion therein; also wg21.link/cwg2102. — T.C.
– T.C., Commented May 20, 2016 at 4:26

vsoftco · Accepted Answer · 2016-05-20 18:42:15Z

0

I'll turn @T.C. comment into an answer, so everyone sees what's going on without having to read through all of the comments.

This is a clang bug, the code should be accepted: http://llvm.org/bugs/show_bug.cgi?id=22924

Related: http://wg21.link/cwg2102

edited May 20, 2016 at 18:42

answered May 20, 2016 at 17:48

vsoftco

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