diff options
author | giovannibajo <giovannibajo@138bc75d-0d04-0410-961f-82ee72b054a4> | 2004-01-10 01:22:06 +0000 |
---|---|---|
committer | giovannibajo <giovannibajo@138bc75d-0d04-0410-961f-82ee72b054a4> | 2004-01-10 01:22:06 +0000 |
commit | ac0e86ef145495837c088854b000198d5ecad464 (patch) | |
tree | e7ab4e31ac294b08c30411b19de19a87b4d61f31 /gcc/testsuite/g++.dg/other | |
parent | 718177344359bb6bc5563dc92102fd60a0e4231b (diff) |
DR 337
PR c++/9256
* g++.dg/other/abstract1.C: New test.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@75619 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'gcc/testsuite/g++.dg/other')
-rw-r--r-- | gcc/testsuite/g++.dg/other/abstract1.C | 59 |
1 files changed, 59 insertions, 0 deletions
diff --git a/gcc/testsuite/g++.dg/other/abstract1.C b/gcc/testsuite/g++.dg/other/abstract1.C new file mode 100644 index 00000000000..86962c7bc3a --- /dev/null +++ b/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-error "" } +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-error "from here" } + + + +/* + * 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; |