clang/test/PCH/cxx23-deducing-this-lambda.cpp

   1 // RUN: %clang_cc1 -emit-pch -std=c++23 -o %t %s
   2 // RUN: %clang_cc1 -include-pch %t -verify -fsyntax-only -DTEST -std=c++23 %s
   3
   4 // Test that dependence of 'this' and DREs due to by-value capture by a
   5 // lambda with an explicit object parameter is serialised/deserialised
   6 // properly.
   7
   8 #ifndef HEADER
   9 #define HEADER
  10 struct S {
  11   int x;
  12   auto f() {
  13     return [*this] (this auto&&) {
  14       int y;
  15       x = 42;
  16
  17       const auto l = [y] (this auto&&) { y = 42; };
  18       l();
  19     };
  20   }
  21 };
  22 #endif
  23
  24 // expected-error@* {{read-only variable is not assignable}}
  25 // expected-error@* {{cannot assign to a variable captured by copy in a non-mutable lambda}}
  26 // expected-note@* 2 {{in instantiation of}}
  27
  28 #ifdef TEST
  29 void f() {
  30   const auto l = S{}.f();
  31   l(); // expected-note {{in instantiation of}}
  32 }
  33 #endif
  34
  35