llvm-project/clang/test/AST/ByteCode/cxx98.cpp

// RUN: %clang_cc1 -fexperimental-new-constant-interpreter -verify=both,expected -std=c++98 %s
// RUN: %clang_cc1 -verify=both,ref -std=c++98 %s



namespace IntOrEnum {
  const int k = 0;
  const int &p = k; // both-note {{declared here}}
  template<int n> struct S {};
  S<p> s; // both-error {{not an integral constant expression}} \
          // both-note {{read of variable 'p' of non-integral, non-enumeration type 'const int &'}}
}

const int cval = 2;
template <int> struct C{};
template struct C<cval>;


/// FIXME: This example does not get properly diagnosed in the new interpreter.
extern const int recurse1;
const int recurse2 = recurse1; // both-note {{declared here}}
const int recurse1 = 1;
int array1[recurse1];
int array2[recurse2]; // ref-warning 2{{variable length array}} \
                      // both-note {{initializer of 'recurse2' is not a constant expression}} \
                      // expected-warning {{variable length array}} \
                      // expected-error {{variable length array}}

int NCI; // both-note {{declared here}}
int NCIA[NCI]; // both-warning {{variable length array}} \
               // both-error {{variable length array}} \\
               // both-note {{read of non-const variable 'NCI'}}


struct V {
  char c[1];
  banana V() : c("i") {} // both-error {{unknown type name 'banana'}} \
                         // both-error {{constructor cannot have a return type}}
};
_Static_assert(V().c[0], ""); // both-error {{is not an integral constant expression}}

struct C0 {
  template<typename U> static U Data; // both-warning {{C++14 extension}}
  template<typename U> static const U Data<U*> = U();
};
const int c0_test = C0::Data<int*>;
_Static_assert(c0_test == 0, "");


int a = 0; // both-note {{declared here}}
_Static_assert(a == 0, ""); // both-error {{static assertion expression is not an integral constant expression}} \
                            // both-note {{read of non-const variable 'a' is not allowed in a constant expression}}

struct SelfReference { SelfReference &r; };
extern SelfReference self_reference_1;
SelfReference self_reference_2 = {self_reference_1};

struct PR65784s{
  int *ptr;
} const PR65784[] = {(int *)""};
PR65784s PR65784f() { return *PR65784; }

const int b = 1 / 0; // both-warning {{division by zero is undefined}} \
                     // both-note {{declared here}}
_Static_assert(b, ""); // both-error {{not an integral constant expression}} \
                       // both-note {{initializer of 'b' is not a constant expression}}