https://llvm.org/bugs/show_bug.cgi?id=24257
Bug ID: 24257
Summary: bad sort order for candidates
Product: clang
Version: unspecified
Hardware: PC
OS: All
Status: NEW
Severity: normal
Priority: P
Component: C++
Assignee: unassignedclangb...@nondot.org
Reporter: nlewy...@google.com
CC: dgre...@apple.com, llvmbugs@cs.uiuc.edu
Classification: Unclassified
$ cat b16776752-1.cc
struct Y {};
struct X {
X();
X(const X&) = delete;
X(const X&&) = delete;
X(Y&);
};
void test() {
const Y y{};
X x2(y);
}
$ clang b16776752-1.cc -std=c++14
b16776752-1.cc:12:5: error: no matching constructor for initialization of 'X'
X x2(y);
^ ~
b16776752-1.cc:5:3: note: candidate constructor not viable: no known conversion
from 'const Y' to 'const X' for 1st argument
X(const X&) = delete;
^
b16776752-1.cc:6:3: note: candidate constructor not viable: no known conversion
from 'const Y' to 'const X' for 1st argument
X(const X&&) = delete;
^
b16776752-1.cc:7:3: note: candidate constructor not viable: 1st argument
('const Y') would lose const qualifier
X(Y&);
^
b16776752-1.cc:4:3: note: candidate constructor not viable: requires 0
arguments, but 1 was provided
X();
^
1 error generated.
The two constructors are both non-viable and deleted. The X(Y&) ctor is
non-viable only by a const qualifier, so it should sort ahead of the others.
The deleted ctors should probably sort last.
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