dune-common 2.9.0
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A range transforming the values of another range on-the-fly. More...
#include <dune/common/rangeutilities.hh>
Public Types | |
using | const_iterator = Impl::TransformedRangeIterator< RawConstIterator, F, T > |
Const iterator type. | |
using | iterator = Impl::TransformedRangeIterator< RawIterator, F, T > |
Iterator type. | |
using | RawRange = std::remove_reference_t< R > |
Export type of the wrapped untransformed range. | |
Public Member Functions | |
template<class RR > | |
constexpr | TransformedRangeView (RR &&rawRange, const F &f) noexcept |
Construct from range and function. | |
constexpr const_iterator | begin () const noexcept |
Obtain a iterator to the first element. | |
constexpr iterator | begin () noexcept |
constexpr const_iterator | end () const noexcept |
Obtain a iterator past the last element. | |
constexpr iterator | end () noexcept |
template<class Dummy = R, class = std::void_t<decltype(std::declval<Dummy>().size())>> | |
auto | size () const |
Obtain the size of the range. | |
const RawRange & | rawRange () const |
Export the wrapped untransformed range. | |
RawRange & | rawRange () |
Export the wrapped untransformed range. | |
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.
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.
using Dune::TransformedRangeView< R, F, T >::const_iterator = Impl::TransformedRangeIterator<RawConstIterator, F, T> |
Const iterator type.
This inherits the iterator_category of the iterators of the underlying range.
using Dune::TransformedRangeView< R, F, T >::iterator = Impl::TransformedRangeIterator<RawIterator, F, T> |
Iterator type.
This inherits the iterator_category of the iterators of the underlying range.
using Dune::TransformedRangeView< R, F, T >::RawRange = std::remove_reference_t<R> |
Export type of the wrapped untransformed range.
Notice that this will always be the raw type with references removed, even if a reference is stored.
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inlineconstexprnoexcept |
Construct from range and function.
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inlineconstexprnoexcept |
Obtain a iterator to the first element.
The life time of the returned iterator is bound to the life time of the range since it only contains a pointer to the transformation function stored in the range.
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inlineconstexprnoexcept |
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inlineconstexprnoexcept |
Obtain a iterator past the last element.
The life time of the returned iterator is bound to the life time of the range since it only contains a pointer to the transformation function stored in the range.
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inlineconstexprnoexcept |
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inline |
Export the wrapped untransformed range.
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inline |
Export the wrapped untransformed range.
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inline |