Jason Merrill
dc7f1bfbe5
In the testcase, the user wants the assignment to use the operator= declared in the class, but because [over.match.list] says that explicit constructors are also considered for list-initialization, as affirmed in CWG1228, we end up choosing the implicitly-declared copy assignment operator, using the explicit constructor template for the argument, which is ill-formed. Other implementations haven't implemented CWG1228, so we keep getting bug reports. Discussion in CWG led to the idea for this targeted relaxation: if we use an explicit constructor for the conversion to the argument of a copy or move special member function, that makes the candidate worse than another. DR 2735 PR c++/109247 gcc/cp/ChangeLog: * call.cc (sfk_copy_or_move): New. (joust): Add tiebreaker for explicit conv and copy ctor. gcc/testsuite/ChangeLog: * g++.dg/cpp0x/initlist-explicit3.C: New test.
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