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DR 337 PR c++/9256 

DR 337
	PR c++/9256
	* g++.dg/other/abstract1.C: New test.

From-SVN: r75619
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Giovanni Bajo 2004-01-10 01:22:06 +00:00
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gcc/testsuite/ChangeLog
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2004-01-10 Giovanni Bajo <giovannibajo@gcc.gnu.org>
DR 337
PR c++/9256
* g++.dg/other/abstract1.C: New test.
2004-01-09 Alexandre Oliva <aoliva@redhat.com>
* g++.dg/lookup/strong-using-1.C: New.

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gcc/testsuite/g++.dg/other/abstract1.C Normal file
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// { 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;