llvm-project/clang/test/SemaTemplate/instantiate-declref-ice.cpp
Douglas Gregor 959d5a0cbd Implement support for variable length arrays in C++. VLAs are limited
in several important ways:

  - VLAs of non-POD types are not permitted.
  - VLAs cannot be used in conjunction with C++ templates.

These restrictions are intended to keep VLAs out of the parts of the
C++ type system where they cause the most trouble. Fixes PR5678 and
<rdar://problem/8013618>.

llvm-svn: 104443
2010-05-22 16:17:30 +00:00

35 lines
721 B
C++

// RUN: %clang_cc1 -fsyntax-only -verify %s
template<int i> struct x {
static const int j = i;
x<j>* y;
};
template<int i>
const int x<i>::j;
int array0[x<2>::j];
template<typename T>
struct X0 {
static const unsigned value = sizeof(T);
};
template<typename T>
const unsigned X0<T>::value;
int array1[X0<int>::value == sizeof(int)? 1 : -1];
const unsigned& testX0() { return X0<int>::value; }
int array2[X0<int>::value == sizeof(int)? 1 : -1];
template<typename T>
struct X1 {
static const unsigned value;
};
template<typename T>
const unsigned X1<T>::value = sizeof(T);
int array3[X1<int>::value == sizeof(int)? 1 : -1]; // expected-error{{variable length array declaration not allowed at file scope}}