https://bugs.llvm.org/show_bug.cgi?id=41765
Bug ID: 41765
Summary: Clang allows structured binding of a closure object
inside its operator()
Product: clang
Version: trunk
Hardware: PC
OS: Linux
Status: NEW
Keywords: accepts-invalid
Severity: normal
Priority: P
Component: C++'17
Assignee: unassignedclangb...@nondot.org
Reporter: language.law...@gmail.com
CC: blitzrak...@gmail.com, erik.pilking...@gmail.com,
llvm-bugs@lists.llvm.org, richard-l...@metafoo.co.uk
Since https://wg21.link/P0969R0 (implemented in [1]) structured binding of a
class does not rely on publicity of the members, only accessibility. So it is
possible to decompose a closure from the inside of its operator().
int main()
{
int x = 1, y = 2;
auto f = [&](auto self) {
(void)x; (void)y; // make 'em used!
auto& [a, b] = *self; // a == 1, b == 2. Depends on the
previous line.
return b - a;
};
return f(&f); // returns 1
}
https://wandbox.org/permlink/CVlWjnDHPPMbRT2r
[1]
https://github.com/llvm/llvm-project/commit/5c9b3b757623e6bea5b4929b2046a565ee2d11bc
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