Template Argument Deduction Broken in Clang 6 for Temporary Objects

Question

Template argument deduction appears to be broken in Clang 6 for temporary objects.

g++ 8.1.0 compiles and runs the example correctly.

Clang 6.0.0 and 6.0.2 b

Answer 1

This is Clang bug 34091.

Luckily, it is already fixed, and the trunk build of Clang compiles this without issue.

As far as I know, however, there is currently no way to work around this without code changes, short of upgrading to the next Clang release whenever that comes out.