2005-04-06 Thierry GERAUD &lt;theo(a)tegucigalpa.lrde.epita.fr&gt; * mlc/bool.hh: Make clear that ::ret is not ::val. * mlc/properties.hh: Likewise. * mlc/if.hh: Likewise. * mlc/value.hh: Likewise. * tests/main/tests/is_a1: Likewise. Index: tests/main/tests/is_a1 =================================================================== --- tests/main/tests/is_a1 (revision 115) +++ tests/main/tests/is_a1 (working copy) @@ -13,21 +13,21 @@ 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(); + is_false<mlc_is_a(int, bool)::val>::ensure(); + is_true<mlc_is_a(B, A)::val>::ensure(); + is_true<mlc_is_a(C, A)::val>::ensure(); + is_false<mlc_is_a(A, B)::val>::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_false<mlc_is_a_(int, bool)::val>::ensure(); + is_true<mlc_is_a_(B, A)::val>::ensure(); + is_true<mlc_is_a_(C, A)::val>::ensure(); + is_false<mlc_is_a_(A, B)::val>::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(); + is_true<mlc_is_a_(T_B<int>, T_A)::val>::ensure(); + is_false<mlc_is_a_(T_A<int>, T_B)::val>::ensure(); foo<int>(); } Index: mlc/bool.hh =================================================================== --- mlc/bool.hh (revision 115) +++ mlc/bool.hh (working copy) @@ -34,30 +34,62 @@ namespace mlc { + struct Boolean_value + { + }; - /// Specialization of mlc::value for T = bool and v = true; it provides ::ensure(). + /// Specializations of mlc::value for T = bool; when v = true, ensure() is provided. + template <> - struct value <bool, true> + struct value <bool, true> : public Boolean_value { + static const bool b = true; + static const bool val = true; static void ensure() {} - static const bool ret = true; - private: - value(); + protected: + value() {} }; + template <> + struct value <bool, false> : public Boolean_value + { + static const bool b = false; + static const bool val = false; + protected: + value() {} + }; + /// Typedefs of true_type and false_type. typedef value<bool, true> true_type; typedef value<bool, false> false_type; - /// Class is_true<b> (provided for bkd compability). - template <bool b> - struct is_true : public value<bool, b> + /// Classes is_true<b> and is_false<b> (provided for bkd compability). + + template <bool b> struct is_true {}; + template <> struct is_true <true> { static void ensure() {} }; + + template <bool b> struct is_false {}; + template <> struct is_false <false> { static void ensure() {} }; + + + + /// Logical unary not of a Boolean type + + template <typename T> + struct not_ : public value<bool, !T::b> { + // FIXME: static assert here and below s.a. ~not_() { mlc_is_a(not_<T>, Boolean_value); } }; + /// Logical binary operators between a couple of Boolean types + template <typename L, typename R> struct and_ : public value <bool, (L::b && R::b)> {}; + template <typename L, typename R> struct or_ : public value <bool, (L::b || R::b)> {}; + template <typename L, typename R> struct nand_ : public value <bool, (L::b && !R::b)> {}; + template <typename L, typename R> struct xor_ : public value <bool, ((L::b && !R::b) || (!L::b && R::b))> {}; + } // end of namespace mlc Index: mlc/properties.hh =================================================================== --- mlc/properties.hh (revision 115) +++ mlc/properties.hh (working copy) @@ -33,6 +33,7 @@ # include <mlc/if.hh> # include <mlc/cmp.hh> +# include <mlc/types.hh> Index: mlc/if.hh =================================================================== --- mlc/if.hh (revision 115) +++ mlc/if.hh (working copy) @@ -38,19 +38,30 @@ namespace mlc { - template <typename cond_type, typename then_type, typename else_type> - struct if_; - - template <typename then_type, typename else_type> - struct if_ <true_type, then_type, else_type> + namespace internal { - typedef then_type ret; - }; - template <typename then_type, typename else_type> - struct if_ <false_type, then_type, else_type> + template <bool b, typename then_type, typename else_type> + struct if_; + + template <typename then_type, typename else_type> + struct if_ <true, then_type, else_type> + { + typedef then_type ret; + }; + + template <typename then_type, typename else_type> + struct if_ <false, then_type, else_type> + { + typedef else_type ret; + }; + + } // end of namespace mlc::internal + + + template <typename cond_type, typename then_type, typename else_type> + struct if_ : public internal::if_ < cond_type::b, then_type, else_type > { - typedef else_type ret; }; Index: mlc/value.hh =================================================================== --- mlc/value.hh (revision 115) +++ mlc/value.hh (working copy) @@ -39,9 +39,9 @@ template <typename T, T v> struct value { - static const T ret = v; - private: - value(); + static const T val = v; + value() {} + operator T() const { return v; } };