https://bugs.llvm.org/show_bug.cgi?id=40555
Bug ID: 40555
Summary: clang emits misleading diagnostic messages about copy
assignment operators when a class has a nested
anonymous union member
Product: clang
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: enhancement
Priority: P
Component: C++11
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected],
[email protected], [email protected],
[email protected]
When the following code is compiled, the diagnostic message says the copy
assignment operator of the containing class is deleted because the variant
field has a non-trivial copy assignment operator instead of saying it has a
deleted copy assignment operator.
$ cat test.cpp
struct S0 {
S0(const S0 &);
S0 &operator=(const S0 &);
int *p;
};
struct S1 {
union {
union { // copy assignment operator is deleted because of s10.
S0 s10;
int b;
};
int c;
};
~S1();
};
S1 *x0;
void testC1(S1 *a0) {
*a0 = *x0;
*a0 = static_cast<S1&&>(*x0);
}
$ clang++ -std=c++11 -c test.cpp
test.cpp:21:7: error: object of type 'S1' cannot be assigned because its copy
assignment operator is implicitly deleted
*a0 = *x0; // error: object of type 'S1' cannot be assigned because it...
^
test.cpp:9:5: note: copy assignment operator of 'S1' is implicitly deleted
because variant field '' has a non-trivial copy assignment operator
union { // copy assignment operator of 'S1' is implicitly deleted bec...
^
test.cpp:22:7: error: object of type 'S1' cannot be assigned because its copy
assignment operator is implicitly deleted
*a0 = static_cast<S1&&>(*x0); // error: object of type 'S1' cannot be a...
^
test.cpp:9:5: note: copy assignment operator of 'S1' is implicitly deleted
because variant field '' has a non-trivial copy assignment operator
union { // copy assignment operator of 'S1' is implicitly deleted bec...
^
2 errors generated.
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