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This fixes some problems wrt dependence of captures in lambdas with an explicit object parameter. [temp.dep.expr] states that > An id-expression is type-dependent if [...] its terminal name is > - associated by name lookup with an entity captured by copy > ([expr.prim.lambda.capture]) in a lambda-expression that has > an explicit object parameter whose type is dependent [dcl.fct]. There were several issues with our implementation of this: 1. we were treating by-reference captures as dependent rather than by-value captures; 2. tree transform wasn't checking whether referring to such a by-value capture should make a DRE dependent; 3. when checking whether a DRE refers to such a by-value capture, we were only looking at the immediately enclosing lambda, and not at any parent lambdas; 4. we also forgot to check for implicit by-value captures; 5. lastly, we were attempting to determine whether a lambda has an explicit object parameter by checking the `LambdaScopeInfo`'s `ExplicitObjectParameter`, but it seems that that simply wasn't set (yet) by the time we got to the check. All of these should be fixed now. This fixes #70604, #79754, #84163, #84425, #86054, #86398, and #86399.
36 lines
804 B
C++
36 lines
804 B
C++
// RUN: %clang_cc1 -emit-pch -std=c++23 -o %t %s
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// RUN: %clang_cc1 -include-pch %t -verify -fsyntax-only -DTEST -std=c++23 %s
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// Test that dependence of 'this' and DREs due to by-value capture by a
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// lambda with an explicit object parameter is serialised/deserialised
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// properly.
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#ifndef HEADER
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#define HEADER
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struct S {
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int x;
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auto f() {
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return [*this] (this auto&&) {
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int y;
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x = 42;
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const auto l = [y] (this auto&&) { y = 42; };
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l();
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};
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}
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};
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#endif
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// expected-error@* {{read-only variable is not assignable}}
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// expected-error@* {{cannot assign to a variable captured by copy in a non-mutable lambda}}
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// expected-note@* 2 {{in instantiation of}}
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#ifdef TEST
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void f() {
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const auto l = S{}.f();
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l(); // expected-note {{in instantiation of}}
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}
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#endif
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