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view: add 'covers' test

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This commit is contained in:
Danny Robson 2018-12-17 14:46:30 +11:00
parent 043dd73677
commit 3925431838
1 changed files with 13 additions and 0 deletions
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13
view.hpp
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@ -674,6 +674,7 @@ namespace cruft {
/////////////////////////////////////////////////////////////////////////// ///////////////////////////////////////////////////////////////////////////
/// Tests whether an iterator falls within a given view.
template <typename IteratorT> template <typename IteratorT>
constexpr bool constexpr bool
intersects (view<IteratorT> a, IteratorT b) intersects (view<IteratorT> a, IteratorT b)
@ -682,6 +683,18 @@ namespace cruft {
} }
///------------------------------------------------------------------------
/// Tests whether view `a` inclusively contains view `b`.
template <typename IteratorA, typename IteratorB>
constexpr bool
covers (
view<IteratorA,IteratorB> const &a,
view<IteratorA,IteratorB> const &b
) {
return a.begin () <= b.begin () && a.end () >= b.end ();
}
/////////////////////////////////////////////////////////////////////////// ///////////////////////////////////////////////////////////////////////////
template < template <
typename BeginA, typename EndA, typename BeginA, typename EndA,