diff options
Diffstat (limited to 'gcc-4.9/gcc/testsuite/g++.dg/other/abstract1.C')
-rw-r--r-- | gcc-4.9/gcc/testsuite/g++.dg/other/abstract1.C | 59 |
1 files changed, 59 insertions, 0 deletions
diff --git a/gcc-4.9/gcc/testsuite/g++.dg/other/abstract1.C b/gcc-4.9/gcc/testsuite/g++.dg/other/abstract1.C new file mode 100644 index 000000000..53d767acd --- /dev/null +++ b/gcc-4.9/gcc/testsuite/g++.dg/other/abstract1.C @@ -0,0 +1,59 @@ +// { dg-do compile } +// Contributed by <giovannibajo at gcc dot gnu dot org>, +// <pavel_vozenilek at hotmail dot com>, +// <bangerth at dealii dot org> +// c++/9256: Make sure that a pointer to an array of abstract elements +// cannot be created, not even during template substitution (DR337). + +struct Abstract { virtual void f() = 0; }; // { dg-message "note" } +struct Complete { void f(); }; + + +/* + * TEST 1 + * Arrays of abstract elements cannot be declared. + */ + +Abstract a0[2]; // { dg-error "" } +Abstract (*a1)[2]; // { dg-error "" } +Abstract (**a2)[2]; // { dg-error "" } +Abstract (***a3)[2]; // { dg-error "" } +Abstract *a4; +Abstract *a5[2]; +Abstract (*a6[2])[2]; // { dg-error "" } +Abstract **a7[2]; +Abstract *(*a8[2])[2]; +Abstract (**a9[2])[2]; // { dg-error "" } + +/* + * TEST 2 + * If a pointer to an array of abstract elements is created during template + * instantiation, an error should occur. + */ + +template <class T> struct K { + T (*a)[2]; // { dg-error "abstract class type" } +}; + +template struct K<Abstract>; // { dg-message "required" } + + + +/* + * TEST 3 + * Deducing an array of abstract elements during type deduction is a silent + * failure (rejects overload). + */ + +template <bool> struct StaticAssert; +template <> struct StaticAssert<true> {}; + +typedef char Yes; +typedef struct { char x[2]; } No; + +template<typename U> No is_abstract(U (*k)[1]); +template<typename U> Yes is_abstract(...); + +StaticAssert<sizeof(is_abstract<Abstract>(0)) == sizeof(Yes)> b1; +StaticAssert<sizeof(is_abstract<Complete>(0)) == sizeof(No)> b2; +StaticAssert<sizeof(is_abstract<int>(0)) == sizeof(No)> b3; |