https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116727
Bug ID: 116727
Summary: "this" is unusable in an explicit object member
function lambda capturing this
Product: gcc
Version: 15.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: c++
Assignee: unassigned at gcc dot gnu.org
Reporter: janschultke at googlemail dot com
Target Milestone: ---
struct awoo {
void chan() {
[this](this auto&& self) {
this;
};
}
};
Clang correctly accepts this, GCC rejects it with the error
(https://godbolt.org/z/rKbzxn863):
> <source>:4:13: error: invalid use of 'this' in non-member function
> [-Wtemplate-body]
> 4 | this;
> | ^~~~
It seems like GCC is falsely rejecting the use of "this" here because the
lambda's call operator is an explicit object member function.
However, lambda bodies do not introduce a class scope (see
http://eel.is/c++draft/expr.prim.this#note-1) and
http://eel.is/c++draft/expr.prim.this#3.sentence-2 states:
> It shall not appear within the declaration of a static or explicit object
> member function of the current class ...
Since there is no current class, it is legal to use "this" in principle, and
the rules for what "this" does should be those stated in [expr.prim.lambda], as
usual.
