clang/test/CXX/expr/expr.prim/expr.prim.lambda/p6.cpp

   1 // RUN: %clang_cc1 -fsyntax-only -std=c++11 %s -verify
   2 // RUN: %clang_cc1 -fsyntax-only -std=c++1z %s -verify
   3 // RUN: %clang_cc1 -fsyntax-only -std=c++11 %s -triple i386-windows-pc -verify
   4 // RUN: %clang_cc1 -fsyntax-only -std=c++1z %s -triple i386-windows-pc -verify
   5
   6 void test_conversion() {
   7   int (*fp1)(int) = [](int x) { return x + 1; };
   8   void (*fp2)(int) = [](int x) { };
   9
  10   const auto lambda = [](int x) { };
  11   void (*fp3)(int) = lambda;
  12
  13   volatile const auto lambda2 = [](int x) { }; // expected-note{{but method is not marked volatile}}
  14   void (*fp4)(int) = lambda2; // expected-error{{no viable conversion}}
  15
  16   void (*fp5)(int) noexcept = [](int x) { };
  17 #if __cplusplus > 201402L
  18   // expected-error@-2 {{no viable}} expected-note@-2 {{candidate}}
  19   void (*fp5a)(int) noexcept = [](auto x) { };
  20   // expected-error@-1 {{no viable}} expected-note@-1 {{candidate}}
  21   void (*fp5b)(int) noexcept = [](auto x) noexcept { };
  22 #endif
  23   void (*fp6)(int) noexcept = [](int x) noexcept { };
  24 }
  25
  26 void test_no_conversion() {
  27   int (*fp1)(int) = [=](int x) { return x + 1; }; // expected-error{{no viable conversion}}
  28   void (*fp2)(int) = [&](int x) { }; // expected-error{{no viable conversion}}
  29 }
  30
  31 void test_wonky() {
  32   const auto l = [](int x) mutable -> int { return + 1; };
  33   l(17); // okay: uses conversion function
  34 }