clang/test/PCH/cxx11-constexpr.cpp

   1 // RUN: %clang_cc1 -pedantic-errors -std=c++11 -emit-pch %s -o %t
   2 // RUN: %clang_cc1 -pedantic-errors -std=c++11 -include-pch %t -verify %s
   3
   4 // RUN: %clang_cc1 -pedantic-errors -std=c++11 -emit-pch -fpch-instantiate-templates %s -o %t
   5 // RUN: %clang_cc1 -pedantic-errors -std=c++11 -include-pch %t -verify %s
   6
   7 #ifndef HEADER_INCLUDED
   8
   9 #define HEADER_INCLUDED
  10
  11 struct B {
  12   B();
  13   constexpr B(char) {}
  14 };
  15
  16 struct C {
  17   B b;
  18   double d = 0.0;
  19 };
  20
  21 struct D : B {
  22   constexpr D(int n) : B('x'), k(2*n+1) {}
  23   int k;
  24 };
  25
  26 constexpr int value = 7;
  27
  28 template<typename T>
  29 constexpr T plus_seven(T other) {
  30   return value + other;
  31 }
  32
  33 #else
  34
  35 static_assert(D(4).k == 9, "");
  36 constexpr int f(C c) { return 0; } // expected-error {{not a literal type}}
  37 // expected-note@16 {{not an aggregate and has no constexpr constructors}}
  38 constexpr B b; // expected-error {{constant expression}} expected-note {{non-constexpr}}
  39                // expected-note@12 {{here}}
  40
  41 static_assert(plus_seven(3) == 10, "");
  42
  43 #endif