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coord/comparator: allow delayed and defaulted deduction of arguments

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This commit is contained in:
Danny Robson 2019-05-12 07:51:42 +10:00
parent 6d48e5a8e5
commit 347b13ee60
1 changed files with 19 additions and 0 deletions
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19
coord/comparator.hpp
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@ -15,6 +15,11 @@
/////////////////////////////////////////////////////////////////////////////// ///////////////////////////////////////////////////////////////////////////////
namespace cruft::coord { namespace cruft::coord {
/// A StrictWeakOrder over coordinate types.
template <typename CoordT = void>
struct ordering;
/// A StrictWeakOrder over coordinate types. /// A StrictWeakOrder over coordinate types.
/// ///
/// The comparison operates across successive elements of the two /// The comparison operates across successive elements of the two
@ -35,4 +40,18 @@ namespace cruft::coord {
return false; return false;
} }
}; };
/// A StrictWeakOrder over coordinate types.
///
/// Deduction is deferred until the function is called, in the same way
/// that std::less<> operates.
template <>
struct ordering<void> {
template <typename CoordT>
bool operator() (CoordT const &a, CoordT const &b) const noexcept
{
return ordering<CoordT> {} (a, b);
}
};
} }