[Olena-patches] proto-1.0 61: Add comparison traits in metalic

Index: ChangeLog from Damien Thivolle &lt;damien(a)lrde.epita.fr&gt; * mlc/cmp.hh: Add comparison traits (greatereq, greater, neq, ...). cmp.hh | 82 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++- 1 files changed, 81 insertions(+), 1 deletion(-) Index: mlc/cmp.hh --- mlc/cmp.hh (revision 59) +++ mlc/cmp.hh (working copy) @@ -32,11 +32,16 @@ # include <mlc/bool.hh> -namespace mlc +namespace mlc { namespace type { + /*-----------------. + | Type comparisons | + `-----------------*/ + + template <typename T, typename U> struct eq : returns_bool_<false> {}; @@ -45,7 +50,82 @@ } // end of namespace type + /*-------------------. + | Values comparisons | + `-------------------*/ + // These struct are quite handy since constructions like + // is_true<a < b>::ensure() cannot be parsed. + + template<int i, int j> + struct less + { + enum { ret = (i < j) }; + static void ensure() { is_true<ret>::ensure(); }; + }; + + template<int i, int j> + struct lesseq + { + enum { ret = (i <= j) }; + static void ensure() { is_true<ret>::ensure(); }; + }; + + template<int i, int j> + struct eq + { + enum { ret = (i == j) }; + static void ensure() { is_true<ret>::ensure(); }; + }; + + template<int i, int j> + struct neq + { + enum { ret = (i != j) }; + static void ensure() { is_true<ret>::ensure(); }; + }; + + template<int i, int j> + struct greater + { + enum { ret = (i > j) }; + static void ensure() { is_true<ret>::ensure(); }; + }; + + template<int i, int j> + struct greatereq + { + enum { ret = (i >= j) }; + static void ensure() { is_true<ret>::ensure(); }; + }; + + template<int i, int j> + struct min + { + enum { ret = (i < j ? i : j) }; + }; + + template<int i, int j> + struct max + { + enum { ret = (i > j ? i : j) }; + }; + + template<int i, int j, int N> + struct maxN + { + enum { ret = (i > j ? + (i > N ? N : i) : + (j > N ? N : j)) }; + }; + + template<int i, int N> + struct saturateN + { + enum { ret = (i > N ? N : i) }; + }; + + } // end of namespace mlc