https://llvm.org/bugs/show_bug.cgi?id=23812
Bug ID: 23812
Summary: Single-element initializer_list invokes wrong
constructor
Product: clang
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: release blocker
Priority: P
Component: C++11
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected]
Classification: Unclassified
Test case:
#include <initializer_list>
#include <iostream>
struct Q {
Q() { std::cout << "default\n"; }
Q(Q const&) { std::cout << "copy\n"; }
Q(Q&&) { std::cout << "move\n"; }
Q(std::initializer_list<Q>) { std::cout << "initializer list\n"; }
};
int main() {
Q x = Q { Q() };
}
"Q { Q() }" should invoke the initializer_list constructor, but recent Clang
(trunk as of today, r239482) treats it as a move instead. For comparison, clang
3.6 and older, gcc 4.9, 5.1, and MSVC2015 all select the initializer_list
constructor.
This is really bad for us, as it silently changes the meaning of code in a
subtle way (manifests as making our JSON library elide single-element array
literals). :(
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