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changed how monoid identity element works

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[SVN r8374]
This commit is contained in:
Jeremy Siek
2000-12-01 00:57:49 +00:00
parent d4e8dfa10f
commit ffa42dd200
2 changed files with 18 additions and 11 deletions
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include/boost/pending/concept_archetypes.hpp
+5 -4
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@@ -36,6 +36,8 @@ namespace boost {
friend void dummy_friend(); // just to avoid warnings
};
// This is a helper class that provides a way to get a reference to
// an object.
template <class T>
class static_object {
public:
@@ -104,8 +106,9 @@ namespace boost {
default_archetype_base(detail::dummy_constructor x) { }
};
// Careful, don't use same type for T and Base. That
// results in the conversion operator being invalid.
// Careful, don't use same type for T and Base. That results in the
// conversion operator being invalid. Since T is often
// null_archetype, can't use null_archetype for Base.
template <class T, class Base = default_archetype_base>
class convertible_to_archetype : public Base {
private:
@@ -295,8 +298,6 @@ namespace boost {
return Return(dummy_cons); \
}
// The default constructor used in Return() above is bad.
BOOST_DEFINE_BINARY_OPERATOR_ARCHETYPE(+, plus_op)
BOOST_DEFINE_BINARY_OPERATOR_ARCHETYPE(*, time_op)
BOOST_DEFINE_BINARY_OPERATOR_ARCHETYPE(/, divide_op)