clang/test/SemaTemplate/instantiate-sizeof.cpp

   1 // RUN: %clang_cc1 -triple x86_64-linux-gnu -fsyntax-only -verify -std=c++11 %s
   2
   3 // Make sure we handle contexts correctly with sizeof
   4 template<typename T> void f(T n) {
   5   int buffer[n];
   6   [] { int x = sizeof(sizeof(buffer)); }();
   7 }
   8 int main() {
   9   f<int>(1);
  10 }
  11
  12 // Make sure we handle references to non-static data members in unevaluated
  13 // contexts in class template methods correctly. Previously we assumed these
  14 // would be valid MemberRefExprs, but they have no 'this' so we need to form a
  15 // DeclRefExpr to the FieldDecl instead.
  16 // PR26893
  17 template <class T>
  18 struct M {
  19   M() {}; // expected-note {{in instantiation of default member initializer 'M<S>::m' requested here}}
  20   int m = *T::x; // expected-error {{invalid use of non-static data member 'x'}}
  21   void f() {
  22     // These are valid.
  23     static_assert(sizeof(T::x) == 8, "ptr");
  24     static_assert(sizeof(*T::x) == 4, "int");
  25   }
  26 };
  27 struct S { int *x; };
  28 template struct M<S>; // expected-note {{in instantiation of member function 'M<S>::M' requested here}}
  29
  30 // Similar test case for PR26893.
  31 template <typename T=void>
  32 struct bar {
  33   struct foo { int array[10]; };
  34   int baz() { return sizeof(foo::array); }
  35 };
  36 template struct bar<>;