clang/test/Parser/cxx1z-constexpr-lambdas.cpp

   1 // RUN: %clang_cc1 -std=c++2b %s -verify
   2 // RUN: %clang_cc1 -std=c++20 %s -verify
   3 // RUN: %clang_cc1 -std=c++17 %s -verify
   4 // RUN: %clang_cc1 -std=c++14 %s -verify
   5 // RUN: %clang_cc1 -std=c++11 %s -verify
   6
   7 auto XL0 = [] constexpr { return true; };
   8 #if __cplusplus <= 201402L
   9 // expected-warning@-2 {{is a C++17 extension}}
  10 #endif
  11 #if __cplusplus <= 202002L
  12 // expected-warning@-5 {{lambda without a parameter clause is a C++2b extension}}
  13 #endif
  14 auto XL1 = []() mutable //
  15     mutable             // expected-error{{cannot appear multiple times}}
  16     mutable {};         // expected-error{{cannot appear multiple times}}
  17
  18 #if __cplusplus > 201402L
  19 auto XL2 = [] () constexpr mutable constexpr { }; //expected-error{{cannot appear multiple times}}
  20 auto L = []() mutable constexpr { };
  21 auto L2 = []() constexpr { };
  22 auto L4 = []() constexpr mutable { };
  23 auto XL16 = [] () constexpr
  24                   mutable
  25                   constexpr   //expected-error{{cannot appear multiple times}}
  26                   mutable     //expected-error{{cannot appear multiple times}}
  27                   mutable     //expected-error{{cannot appear multiple times}}
  28                   constexpr   //expected-error{{cannot appear multiple times}}
  29                   constexpr   //expected-error{{cannot appear multiple times}}
  30                   { };
  31
  32 #else
  33 auto L = []() mutable constexpr {return 0; }; //expected-warning{{is a C++17 extension}}
  34 auto L2 = []() constexpr { return 0;};//expected-warning{{is a C++17 extension}}
  35 auto L4 = []() constexpr mutable { return 0; }; //expected-warning{{is a C++17 extension}}
  36 #endif
  37
  38