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template<class RR , class FF > |
constexpr | TransformedRangeView (RR &&rawRange, FF &&f) noexcept |
| Construct from range and function.
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constexpr const_iterator | begin () const noexcept |
| Obtain a iterator to the first element.
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constexpr iterator | begin () noexcept |
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constexpr const_iterator | end () const noexcept |
| Obtain a iterator past the last element.
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constexpr iterator | end () noexcept |
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template<class It = const_iterator, std::enable_if_t< std::is_same_v< typename It::iterator_category, std::random_access_iterator_tag >, int > = 0> |
constexpr decltype(auto) | operator[] (std::size_t i) const noexcept |
| Provide const element access for random-accessible ranges.
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template<class It = iterator, std::enable_if_t< std::is_same_v< typename It::iterator_category, std::random_access_iterator_tag >, int > = 0> |
constexpr decltype(auto) | operator[] (std::size_t i) noexcept |
| Provide mutable element access for random-accessible ranges.
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template<class Range = R, class = std::void_t<decltype(std::declval<const Range>().size())>> |
auto | size () const noexcept |
| Obtain the size of the range.
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constexpr bool | empty () const noexcept |
| Checks whether the range is empty.
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const RawRange & | rawRange () const noexcept |
| Export the wrapped untransformed range.
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RawRange & | rawRange () noexcept |
| Export the wrapped untransformed range.
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template<class R, class F, class T = ValueTransformationTag>
class Dune::TransformedRangeView< R, F, T >
A range transforming the values of another range on-the-fly.
This behaves like a range providing begin()
and end()
. The iterators over this range internally iterate over the wrapped range. When dereferencing the iterator, the value is transformed on-the-fly using a given transformation function leaving the underlying range unchanged.
The transformation may either return temporary values or l-value references. In the former case the range behaves like a proxy-container. In the latter case it forwards these references allowing, e.g., to sort a subset of some container by applying a transformation to an index-range for those values.
The iterators of the TransformedRangeView have the same iterator_category as the ones of the wrapped container.
If range is given as r-value, then the returned TransformedRangeView stores it by value, if range is given as (const) l-value, then the TransformedRangeView stores it by (const) reference.
If R is a value type, then the TransformedRangeView stores the wrapped range by value, if R is a reference type, then the TransformedRangeView stores the wrapped range by reference.
- Template Parameters
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R | Underlying range. |
F | Unary function used to transform the values in the underlying range. |
T | Class for describing how to apply the transformation |
T has to be either ValueTransformationTag (default) or IteratorTransformationTag. In the former case, the transformation is applied to the values obtained by dereferencing the wrapped iterator. In the latter case it is applied to the iterator directly, allowing to access non-standard functions of the iterator.