path: root/test/SemaCXX/constant-expression-cxx11.cpp

// RUN: %clang_cc1 -triple i686-linux -fsyntax-only -verify -std=c++11 -pedantic %s -Wno-comment

namespace StaticAssertFoldTest {

int x;
static_assert(++x, "test"); // expected-error {{not an integral constant expression}}
static_assert(false, "test"); // expected-error {{test}}

}

typedef decltype(sizeof(char)) size_t;

template<typename T> constexpr T id(const T &t) { return t; }
template<typename T> constexpr T min(const T &a, const T &b) {
  return a < b ? a : b;
}
template<typename T> constexpr T max(const T &a, const T &b) {
  return a < b ? b : a;
}
template<typename T, size_t N> constexpr T *begin(T (&xs)[N]) { return xs; }
template<typename T, size_t N> constexpr T *end(T (&xs)[N]) { return xs + N; }

struct MemberZero {
  constexpr int zero() { return 0; }
};

namespace DerivedToVBaseCast {

  struct U { int n; };
  struct V : U { int n; };
  struct A : virtual V { int n; };
  struct Aa { int n; };
  struct B : virtual A, Aa {};
  struct C : virtual A, Aa {};
  struct D : B, C {};

  D d;
  constexpr B *p = &d;
  constexpr C *q = &d;
  static_assert((void*)p != (void*)q, "");
  static_assert((A*)p == (A*)q, "");
  static_assert((Aa*)p != (Aa*)q, "");

  constexpr B &pp = d;
  constexpr C &qq = d;
  static_assert((void*)&pp != (void*)&qq, "");
  static_assert(&(A&)pp == &(A&)qq, "");
  static_assert(&(Aa&)pp != &(Aa&)qq, "");

  constexpr V *v = p;
  constexpr V *w = q;
  constexpr V *x = (A*)p;
  static_assert(v == w, "");
  static_assert(v == x, "");

  static_assert((U*)&d == p, "");
  static_assert((U*)&d == q, "");
  static_assert((U*)&d == v, "");
  static_assert((U*)&d == w, "");
  static_assert((U*)&d == x, "");

  struct X {};
  struct Y1 : virtual X {};
  struct Y2 : X {};
  struct Z : Y1, Y2 {};
  Z z;
  static_assert((X*)(Y1*)&z != (X*)(Y2*)&z, "");

}

namespace ConstCast {

constexpr int n1 = 0;
constexpr int n2 = const_cast<int&>(n1);
constexpr int *n3 = const_cast<int*>(&n1);
constexpr int n4 = *const_cast<int*>(&n1);
constexpr const int * const *n5 = const_cast<const int* const*>(&n3);
constexpr int **n6 = const_cast<int**>(&n3);