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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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stl_concept_covering.cpp
+13 -7
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@@ -109,13 +109,19 @@ namespace part_sum
// for std::power
template <class Base>
boost::multipliable_archetype<Base>
identity_element(std::multiplies< boost::multipliable_archetype<Base> >) {
return boost::multipliable_archetype<Base>(boost::dummy_cons);
namespace power_stuff {
struct monoid_archetype {
monoid_archetype(boost::detail::dummy_constructor x) { }
};
boost::multipliable_archetype<monoid_archetype>
identity_element
(std::multiplies< boost::multipliable_archetype<monoid_archetype> >)
{
return boost::multipliable_archetype<monoid_archetype>(boost::dummy_cons);
}
}
int
main()
{
@@ -1075,12 +1081,12 @@ main()
// SGI STL extension
{
int n = 1;
multipliable_archetype<> x(dummy_cons);
multipliable_archetype<power_stuff::monoid_archetype> x(dummy_cons);
x = std::power(x, n);
}
{
int n = 1;
typedef multipliable_archetype<> T;
typedef multipliable_archetype<power_stuff::monoid_archetype> T;
T x(dummy_cons);
x = std::power(x, n, multiplies<T>());
}