Index: ChangeLog from Simon Odou &lt;simon(a)lrde.epita.fr&gt; * mlc/is_a.hh: New. Test inheritance between two classes. * tests/main/tests/is_a1: New. Add test for `is_a'. * tests/main: New. Add new test suite `main'. * tests/main/tests: New. * tests/main/Makefile.am: New. mlc/is_a.hh | 193 +++++++++++++++++++++++++++++++++++++++++++++++++ tests/main/Makefile.am | 3 tests/main/tests/is_a1 | 33 ++++++++ 3 files changed, 229 insertions(+) Index: tests/main/tests/is_a1 --- tests/main/tests/is_a1 (revision 0) +++ tests/main/tests/is_a1 (revision 0) @@ -0,0 +1,33 @@ +#include <mlc/bool.hh> +#include <mlc/is_a.hh> + +using namespace mlc; + +class A {}; +class B : public A {}; +class C : public B {}; + +template <class E> class T_A {}; +template <class T> class T_B : public T_A<T> {}; + +template <class T> +void foo() +{ + is_false<mlc_is_a(int, bool)::ret>::ensure(); + is_true<mlc_is_a(B, A)::ret>::ensure(); + is_true<mlc_is_a(C, A)::ret>::ensure(); + is_false<mlc_is_a(A, B)::ret>::ensure(); +} + +int main() +{ + is_false<mlc_is_a_(int, bool)::ret>::ensure(); + is_true<mlc_is_a_(B, A)::ret>::ensure(); + is_true<mlc_is_a_(C, A)::ret>::ensure(); + is_false<mlc_is_a_(A, B)::ret>::ensure(); + + is_true<mlc_is_a_(T_B<int>, T_A)::ret>::ensure(); + is_false<mlc_is_a_(T_A<int>, T_B)::ret>::ensure(); + + foo<int>(); +} Index: tests/main/Makefile.am --- tests/main/Makefile.am (revision 0) +++ tests/main/Makefile.am (revision 0) @@ -0,0 +1,3 @@ +## Process this file with Automake to produce Makefile.in -*- Makefile -*- + +include ../check/Makefile.runtests Index: mlc/is_a.hh --- mlc/is_a.hh (revision 0) +++ mlc/is_a.hh (revision 0) @@ -0,0 +1,193 @@ +// Copyright (C) 2001, 2002, 2003, 2004, 2005 EPITA Research and Development Laboratory +// +// This file is part of the Olena Library. This library is free +// software; you can redistribute it and/or modify it under the terms +// of the GNU General Public License version 2 as published by the +// Free Software Foundation. +// +// This library is distributed in the hope that it will be useful, +// but WITHOUT ANY WARRANTY; without even the implied warranty of +// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU +// General Public License for more details. +// +// You should have received a copy of the GNU General Public License +// along with this library; see the file COPYING. If not, write to +// the Free Software Foundation, 59 Temple Place - Suite 330, Boston, +// MA 02111-1307, USA. +// +// As a special exception, you may use this file as part of a free +// software library without restriction. Specifically, if other files +// instantiate templates or use macros or inline functions from this +// file, or you compile this file and link it with other files to +// produce an executable, this file does not by itself cause the +// resulting executable to be covered by the GNU General Public +// License. This exception does not however invalidate any other +// reasons why the executable file might be covered by the GNU General +// Public License. + +#ifndef METALIC_IS_A_HH +# define METALIC_IS_A_HH + +# include <mlc/any.hh> +# include <mlc/bool.hh> + +// private macro so do _not_ use it +# define is_a__check_result_ \ +sizeof(helper<T ,U >::check( (T *) helper<T,U >::makeT() )) \ +== sizeof(mlc::internal::yes_) + + +namespace mlc +{ + + namespace internal + { + + // + // wrap + // + // FIXME: This type is a workaround for g++-2.95 problem with implicit + // typename in <foo<T>::ret::dim>, + // write <wrap<typename foo<T>::ret>::dim instead. + // + + template <class T> struct wrap : public T {}; + + } // internal + + /*-----. + | is_a | + `-----*/ + + // FIXME: form is a namespace to avoid g++-3.2 bug with template function + // overloading in class. + + namespace form + { + enum { + class_ = 1, + template_l_class_g_class_ = 2, + template_l_class_class_g_class_ = 3 + // template_l_unsigned_class_g_class_ = 4 + // ... + }; + + template<unsigned id> + struct desc + { char dummy[id]; }; + + template<class T> + static desc< class_ > get(); + + template<template<class> class T> + static desc< template_l_class_g_class_ > get(); + + template<template<class,class> class T> + static desc< template_l_class_class_g_class_ > get(); + + // template<template<unsigned,class> class T> + // static desc < template_l_unsigned_class_g_class_ > get(); + + // ... + } + + namespace internal + { + + typedef char yes_; + struct no_ { char dummy[2]; }; + + + // dev note : below, is_a_<T,id> is a better factorization + // but g++ 2.95.4 has some trouble with it + + template<unsigned id> + struct is_a_; + + // _class_ + + + template<> + struct is_a_< form::class_ > + { + typedef is_a_< form::class_ > self; + + template<class T, class U> + struct helper + { + static yes_ check(U*); + static no_ check(...); + static T* makeT(); + }; + + template<class T, class U> + struct check + : public mlc::returns_bool_<( is_a__check_result_ )> + { + }; + }; + + // template_l_class_g_class_ + + template<> + struct is_a_< form::template_l_class_g_class_ > + { + typedef is_a_< form::template_l_class_g_class_ > self; + + template<class T, template<class> class U> + struct helper + { + template<class V> + static yes_ check(U<V>*); + static no_ check(...); + static T* makeT(); + }; + + template<class T, template<class> class U> + struct check + : public mlc::returns_bool_<( is_a__check_result_ )> + { + }; + }; + + // templatee_l_class_class_g_class_ + + template<> + struct is_a_< form::template_l_class_class_g_class_ > + { + typedef is_a_< form::template_l_class_class_g_class_ > self; + + template<class T, template<class,class> class U> + struct helper + { + template<class V, class W> + static yes_ check(U<V,W>*); + static no_ check(...); + static T* makeT(); + }; + + template<class T, template<class,class> class U> + struct check + : public mlc::returns_bool_<( is_a__check_result_ )> + {}; + }; + + } // end of internal + +} // end of mlc + +// private macros: do _not_ use them +# define is_a__2nd_is_meta(T,U) mlc::internal::is_a_< id_of_typeform(U) >::check<T, U > + +// client macros + +# define id_of_typeform(T) sizeof(mlc::form::get<T >()) + +template <class T> +struct id_ { typedef T ret; }; + +// FIXME: can we get rid of mlc::wrap ? +# define mlc_is_a(T, U) mlc::internal::wrap<typename mlc::internal::is_a_< id_of_typeform(U) >::check<T, U > > +# define mlc_is_a_(T, U) mlc::internal::wrap<mlc::internal::is_a_< id_of_typeform(U) >::check<T, U > > + +#endif // ndef METALIC_IS_A_HH