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Array<int> ia(n); ia.Range(2, END-1)

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This commit is contained in:
Joachim Schoeberl 2021-03-29 22:39:50 +02:00
parent 7b62f39460
commit 1f45601387
1 changed files with 20 additions and 0 deletions
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20
libsrc/core/array.hpp
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@ -212,6 +212,20 @@ namespace ngcore
template <typename T>
constexpr T IndexBASE () { return T(0); }
class IndexFromEnd
{
ptrdiff_t i;
public:
constexpr IndexFromEnd (ptrdiff_t ai) : i(ai) { }
IndexFromEnd operator+ (ptrdiff_t inc) const { return i+inc; }
IndexFromEnd operator- (ptrdiff_t dec) const { return i-dec; }
// operator ptrdiff_t () const { return i; }
ptrdiff_t Value() const { return i; }
};
constexpr IndexFromEnd END(0);
template <class T, class IndexType = size_t> class FlatArray;
@ -560,6 +574,12 @@ namespace ngcore
return FlatArray<T> (end-start, data+start);
}
/// takes range starting from position start of end-start elements
NETGEN_INLINE FlatArray<T> Range (size_t start, IndexFromEnd indend) const
{
return this->Range(start, size_t(Size()+indend.Value()));
}
/// takes range starting from position start of end-start elements
NETGEN_INLINE FlatArray<T> Range (T_Range<size_t> range) const
{