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Merge pull request #240 from denzor200/identity_view
Added boost::fusion::identity_view
This commit is contained in:
Joel de Guzman
GitHub
@ -130,6 +130,7 @@
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[def __reverse_view__ [link fusion.view.reverse_view `reverse_view`]]
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[def __zip_view__ [link fusion.view.zip_view `zip_view`]]
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[def __flatten_view__ [link fusion.view.flatten_view `flatten_view`]]
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[def __identity_view__ [link fusion.view.identity_view `identity_view`]]
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[def __array__ [link fusion.adapted.array array]]
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[def __std_pair__ [link fusion.adapted.std__pair `std::pair`]]
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@ -163,6 +163,7 @@
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<dt><span class="section"><a href="fusion/view/zip_view.html">zip_view</a></span></dt>
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<dt><span class="section"><a href="fusion/view/transform_view.html">transform_view</a></span></dt>
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<dt><span class="section"><a href="fusion/view/reverse_view.html">reverse_view</a></span></dt>
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<dt><span class="section"><a href="fusion/view/identity_view.html">identity_view</a></span></dt>
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<dt><span class="section"><a href="fusion/view/nview.html">nview</a></span></dt>
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<dt><span class="section"><a href="fusion/view/repetitive_view.html">repetitive_view</a></span></dt>
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<dt><span class="section"><a href="fusion/view/flatten_view.html">flatten_view</a></span></dt>
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@ -60,6 +60,7 @@ link against.
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* single_view
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* transform_view
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* zip_view
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* identity_view
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* container
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* deque
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* list
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@ -133,6 +133,7 @@ For any Forward Sequence s the following invariants always hold:
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* __transform_view__
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* __reverse_view__
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* __zip_view__
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* __identity_view__
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[endsect]
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@ -201,6 +202,7 @@ are not defined in __forward_sequence__.
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* __iterator_range__ (where adapted sequence is a Bidirectional Sequence)
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* __transform_view__ (where adapted sequence is a Bidirectional Sequence)
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* __zip_view__ (where adapted sequences are models of Bidirectional Sequence)
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* __identity_view__ (where adapted sequence is a Bidirectional Sequence)
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[endsect]
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@ -289,6 +291,7 @@ are not defined in __bidirectional_sequence__.
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* __iterator_range__ (where adapted sequence is a Random Access Sequence)
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* __transform_view__ (where adapted sequence is a Random Access Sequence)
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* __zip_view__ (where adapted sequences are models of Random Access Sequence)
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* __identity_view__ (where adapted sequence is a Random Access Sequence)
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[endsect]
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@ -361,6 +364,7 @@ you can use `__result_of_value_at_key__<S, K>`.]
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* __joint_view__ (where adapted sequences are __associative_sequence__\ s and __forward_sequence__\ s)
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* __reverse_view__ (where adapted sequence is an __associative_sequence__ and a __bidirectional_sequence__)
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* __transform_view__ (where adapted sequence is an __associative_sequence__ and a __forward_sequence__)
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* __identity_view__ (where adapted sequence is an __associative_sequence__ and a __forward_sequence__)
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[endsect]
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57
doc/view.qbk
57
doc/view.qbk
@ -1,6 +1,7 @@
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[/==============================================================================
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Copyright (C) 2001-2011 Joel de Guzman
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Copyright (C) 2006 Dan Marsden
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Copyright (c) 2022 Denis Mikhailov
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Use, modification and distribution is subject to the Boost Software
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License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
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@ -664,4 +665,60 @@ defined in __forward_sequence__.
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[endsect]
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[section identity_view]
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[heading Description]
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`identity_view` presents underlying sequence unchanged.
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[heading Header]
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#include <boost/fusion/view/identity_view.hpp>
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#include <boost/fusion/include/identity_view.hpp>
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[heading Synopsis]
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template <typename Sequence>
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struct identity_view;
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[heading Template parameters]
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[table
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[[Parameter] [Description] [Default]]
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[[`Sequence`] [A __forward_sequence__] []]
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]
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[heading Model of]
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* A model of __forward_sequence__ if `Sequence` is a __forward_sequence__ else, __bidirectional_sequence__ if `Sequence` is a __bidirectional_sequence__
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else, __random_access_sequence__ if `Sequence` is a __random_access_sequence__.
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* __associative_sequence__ if `Sequence` implements the __associative_sequence__ model.
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[variablelist Notation
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[[`IV`] [An `identity_view` type]]
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[[`s`] [An instance of `Sequence`]]
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[[`iv`, `iv2`] [Instances of `identity_view`]]
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]
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[heading Expression Semantics]
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Semantics of an expression is defined only where it differs from, or is not
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defined in the implemented models.
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[table
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[[Expression] [Semantics]]
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[[`IV(s)`] [Creates an `identity_view` given sequence, `s`.]]
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[[`IV(iv)`] [Copy constructs an `identity_view` from another `identity_view`, `iv`.]]
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[[`iv = iv2`] [Assigns to an `identity_view`, `iv`, from another `identity_view`, `iv2`.]]
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]
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[heading Example]
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typedef __vector__<int, short, double> vector_type;
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vector_type vec(2, 5, 3.3);
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__identity_view__<vector_type> identity(vec);
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std::cout << identity << std::endl; // (2 5 3.3)
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[endsect]
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[endsect]
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12
include/boost/fusion/include/identity_view.hpp
Normal file
12
include/boost/fusion/include/identity_view.hpp
Normal file
@ -0,0 +1,12 @@
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/*=============================================================================
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Copyright (c) 2022 Denis Mikhailov
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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==============================================================================*/
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#if !defined(FUSION_INCLUDE_IDENTITY_VIEW)
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#define FUSION_INCLUDE_IDENTITY_VIEW
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#include <boost/fusion/support/config.hpp>
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#include <boost/fusion/view/identity_view.hpp>
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#endif
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@ -17,5 +17,6 @@
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#include <boost/fusion/view/transform_view.hpp>
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#include <boost/fusion/view/zip_view.hpp>
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#include <boost/fusion/view/flatten_view.hpp>
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#include <boost/fusion/view/identity_view.hpp>
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#endif
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14
include/boost/fusion/view/identity_view.hpp
Normal file
14
include/boost/fusion/view/identity_view.hpp
Normal file
@ -0,0 +1,14 @@
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/*=============================================================================
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Copyright (c) 2022 Denis Mikhailov
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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==============================================================================*/
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#if !defined(BOOST_FUSION_SEQUENCE_IDENTITY_VIEW_HPP_INCLUDED)
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#define BOOST_FUSION_SEQUENCE_IDENTITY_VIEW_HPP_INCLUDED
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#include <boost/fusion/support/config.hpp>
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#include <boost/fusion/view/identity_view/identity_view.hpp>
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#endif
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43
include/boost/fusion/view/identity_view/identity_view.hpp
Normal file
43
include/boost/fusion/view/identity_view/identity_view.hpp
Normal file
@ -0,0 +1,43 @@
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/*=============================================================================
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Copyright (c) 2022 Denis Mikhailov
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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==============================================================================*/
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#if !defined(BOOST_FUSION_IDENTITY_VIEW_HPP_INCLUDED)
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#define BOOST_FUSION_IDENTITY_VIEW_HPP_INCLUDED
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#include <boost/fusion/support/config.hpp>
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#include <boost/fusion/view/transform_view.hpp>
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#include <boost/functional/identity.hpp>
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#include <boost/utility/result_of.hpp>
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namespace boost { namespace fusion {
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namespace detail {
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struct identity : boost::identity
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{
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};
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}
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}}
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namespace boost {
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template<typename T>
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struct result_of<fusion::detail::identity(T)>
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{
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typedef T type;
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};
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}
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namespace boost { namespace fusion {
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template<typename Sequence> struct identity_view
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: transform_view<Sequence, detail::identity>
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{
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typedef transform_view<Sequence, detail::identity> base_type;
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BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
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identity_view(Sequence& in_seq)
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: base_type(in_seq, detail::identity()) {}
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};
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}}
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#endif
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@ -156,6 +156,7 @@ project
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: <define>BOOST_FUSION_DISABLE_VARIADIC_VECTOR
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: tuple_traits__no_variadic ]
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[ run sequence/transform_view.cpp ]
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[ run sequence/identity_view.cpp ]
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[ run sequence/vector_comparison.cpp ]
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[ run sequence/vector_construction.cpp ]
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[ run sequence/vector_conversion.cpp ]
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193
test/sequence/identity_view.cpp
Normal file
193
test/sequence/identity_view.cpp
Normal file
@ -0,0 +1,193 @@
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/*=============================================================================
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Copyright (c) 2022 Denis Mikhailov
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Distributed under the Boost Software License, Version 1.0. (See accompanying
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file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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==============================================================================*/
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#include <boost/detail/lightweight_test.hpp>
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#include <boost/fusion/container/vector/vector.hpp>
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#include <boost/fusion/container/map/map.hpp>
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#include <boost/fusion/container/generation/make_map.hpp>
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#include <boost/fusion/algorithm/auxiliary/copy.hpp>
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#include <boost/fusion/adapted/mpl.hpp>
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#include <boost/fusion/sequence/io/out.hpp>
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#include <boost/fusion/container/generation/make_vector.hpp>
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#include <boost/fusion/sequence/comparison/equal_to.hpp>
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#include <boost/fusion/view/identity_view/identity_view.hpp>
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#include <boost/fusion/sequence/intrinsic/begin.hpp>
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#include <boost/fusion/sequence/intrinsic/at.hpp>
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#include <boost/fusion/sequence/intrinsic/value_at.hpp>
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#include <boost/fusion/sequence/intrinsic/at_key.hpp>
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#include <boost/fusion/sequence/intrinsic/value_at_key.hpp>
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#include <boost/fusion/sequence/intrinsic/has_key.hpp>
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#include <boost/fusion/sequence/intrinsic/begin.hpp>
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#include <boost/fusion/iterator/next.hpp>
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#include <boost/fusion/iterator/prior.hpp>
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#include <boost/fusion/iterator/advance.hpp>
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#include <boost/fusion/iterator/deref.hpp>
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#include <boost/fusion/iterator/distance.hpp>
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#include <boost/fusion/iterator/key_of.hpp>
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#include <boost/fusion/iterator/deref_data.hpp>
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#include <boost/fusion/iterator/value_of_data.hpp>
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#include <boost/fusion/support/pair.hpp>
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#include <boost/fusion/support/category_of.hpp>
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#include <boost/mpl/range_c.hpp>
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#include <boost/mpl/assert.hpp>
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#include <boost/mpl/at.hpp>
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#include <boost/mpl/map.hpp>
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#include <boost/type_traits/is_same.hpp>
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#include <boost/static_assert.hpp>
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#include <boost/typeof/typeof.hpp>
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#include <boost/type_traits/remove_reference.hpp>
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struct abstract
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{
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virtual void foo() = 0;
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};
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int
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main()
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{
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using namespace boost::fusion;
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std::cout << tuple_open('[');
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std::cout << tuple_close(']');
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std::cout << tuple_delimiter(", ");
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/// Testing the identity_view
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{
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typedef boost::mpl::range_c<int, 5, 9> sequence_type;
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sequence_type sequence;
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typedef identity_view<sequence_type> xform_type;
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xform_type xform(sequence);
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std::cout << xform << std::endl;
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BOOST_TEST((xform == make_vector(5, 6, 7, 8)));
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typedef boost::fusion::result_of::begin<xform_type>::type first_type;
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first_type first_it(boost::fusion::begin(xform));
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typedef boost::fusion::result_of::next<first_type>::type next_type;
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next_type next_it(boost::fusion::next(first_it));
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BOOST_TEST((*next_it == 6));
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BOOST_TEST((*boost::fusion::prior(next_it) == 5));
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BOOST_TEST((boost::fusion::distance(first_it, next_it) == 1));
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BOOST_TEST((*boost::fusion::advance_c<3>(boost::fusion::begin(xform)) == 8));
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BOOST_TEST((boost::fusion::at_c<2>(xform) == 7));
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BOOST_MPL_ASSERT((boost::is_same<boost::fusion::result_of::value_at_c<xform_type, 0>::type, boost::mpl::integral_c<int, 5> >));
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}
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{
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typedef vector<int, int, int, int, int> sequence_type;
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sequence_type seq;
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identity_view<sequence_type> ident(seq);
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copy(make_vector(1, 2, 3, 4, 5), ident);
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std::cout << seq << std::endl;
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BOOST_TEST((seq == make_vector(1, 2, 3, 4, 5)));
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}
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/// Associative
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{
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typedef map<
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pair<int, char>
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, pair<double, std::string>
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, pair<abstract, int> >
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map_type;
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typedef identity_view<map_type> transformed_type;
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BOOST_MPL_ASSERT((traits::is_associative<transformed_type>));
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BOOST_MPL_ASSERT((traits::is_random_access<transformed_type>));
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map_type m(
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make_pair<int>('X')
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, make_pair<double>("Men")
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, make_pair<abstract>(2));
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transformed_type t(m);
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std::cout << at_key<int>(t) << std::endl;
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std::cout << at_key<double>(t) << std::endl;
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std::cout << at_key<abstract>(t) << std::endl;
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BOOST_TEST(at_key<int>(t) == 'X');
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BOOST_TEST(at_key<double>(t) == "Men");
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BOOST_TEST(at_key<abstract>(t) == 2);
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BOOST_STATIC_ASSERT((
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boost::is_same<boost::fusion::result_of::value_at_key<transformed_type, int>::type, char>::value));
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BOOST_STATIC_ASSERT((
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boost::is_same<boost::fusion::result_of::value_at_key<transformed_type, double>::type, std::string>::value));
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BOOST_STATIC_ASSERT((
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boost::is_same<boost::fusion::result_of::value_at_key<transformed_type, abstract>::type, int>::value));
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std::cout << t << std::endl;
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BOOST_STATIC_ASSERT((boost::fusion::result_of::has_key<transformed_type, int>::value));
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BOOST_STATIC_ASSERT((boost::fusion::result_of::has_key<transformed_type, double>::value));
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BOOST_STATIC_ASSERT((boost::fusion::result_of::has_key<transformed_type, abstract>::value));
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BOOST_STATIC_ASSERT((!boost::fusion::result_of::has_key<transformed_type, std::string>::value));
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std::cout << deref_data(begin(t)) << std::endl;
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std::cout << deref_data(boost::fusion::next(begin(t))) << std::endl;
|
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BOOST_TEST(deref_data(begin(t)) == 'X');
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BOOST_TEST(deref_data(boost::fusion::next(begin(t))) == "Men");
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BOOST_TEST(deref_data(boost::fusion::next(next(begin(t)))) == 2);
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BOOST_STATIC_ASSERT((boost::is_same<boost::fusion::result_of::key_of<boost::fusion::result_of::begin<transformed_type>::type>::type, int>::value));
|
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BOOST_STATIC_ASSERT((boost::is_same<boost::fusion::result_of::key_of<boost::fusion::result_of::next<boost::fusion::result_of::begin<transformed_type>::type>::type>::type, double>::value));
|
||||
BOOST_STATIC_ASSERT((boost::is_same<boost::fusion::result_of::key_of<boost::fusion::result_of::next<boost::fusion::result_of::next<boost::fusion::result_of::begin<transformed_type>::type>::type>::type>::type, abstract>::value));
|
||||
BOOST_STATIC_ASSERT((boost::is_same<boost::fusion::result_of::value_of_data<boost::fusion::result_of::begin<transformed_type>::type>::type, char>::value));
|
||||
BOOST_STATIC_ASSERT((boost::is_same<boost::fusion::result_of::value_of_data<boost::fusion::result_of::next<boost::fusion::result_of::begin<transformed_type>::type>::type>::type, std::string>::value));
|
||||
BOOST_STATIC_ASSERT((boost::is_same<boost::fusion::result_of::value_of_data<boost::fusion::result_of::next<boost::fusion::result_of::next<boost::fusion::result_of::begin<transformed_type>::type>::type>::type>::type, int>::value));
|
||||
|
||||
// Test random access interface.
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||||
pair<int, char> a = at_c<0>(t); (void) a;
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||||
pair<double, std::string> b = at_c<1>(t);
|
||||
pair<abstract, int> c = at_c<2>(t);
|
||||
(void)c;
|
||||
|
||||
typedef boost::fusion::result_of::begin<transformed_type>::type first;
|
||||
typedef boost::fusion::result_of::next<first>::type second;
|
||||
typedef boost::fusion::result_of::next<second>::type third;
|
||||
|
||||
BOOST_MPL_ASSERT((boost::is_same<boost::fusion::result_of::value_of<first>::type, boost::fusion::pair<int, char> >));
|
||||
BOOST_MPL_ASSERT((boost::is_same<boost::fusion::result_of::value_of<second>::type, boost::fusion::pair<double, std::string> >));
|
||||
BOOST_MPL_ASSERT((boost::is_same<boost::fusion::result_of::value_of<third>::type, boost::fusion::pair<abstract, int> >));
|
||||
}
|
||||
|
||||
{
|
||||
// compile test only
|
||||
// make sure result_of::deref_data returns a reference
|
||||
typedef map<pair<float, int> > map_type;
|
||||
typedef identity_view<map_type> transformed_type;
|
||||
typedef boost::fusion::result_of::begin<transformed_type>::type i_type;
|
||||
typedef boost::fusion::result_of::deref_data<i_type>::type r_type;
|
||||
BOOST_STATIC_ASSERT((boost::is_same<r_type, int&>::value));
|
||||
}
|
||||
|
||||
{
|
||||
// compile test only
|
||||
// make sure result_of::deref_data is const correct
|
||||
typedef map<pair<float, int> > const map_type;
|
||||
typedef identity_view<map_type> transformed_type;
|
||||
typedef boost::fusion::result_of::begin<transformed_type>::type i_type;
|
||||
typedef boost::fusion::result_of::deref_data<i_type>::type r_type;
|
||||
BOOST_STATIC_ASSERT((boost::is_same<r_type, int const&>::value));
|
||||
}
|
||||
|
||||
{
|
||||
// compile test only
|
||||
// make sure result_of::deref_data will not const for non-constant references
|
||||
typedef map<pair<float, int&> > const map_type;
|
||||
typedef identity_view<map_type> transformed_type;
|
||||
typedef boost::fusion::result_of::begin<transformed_type>::type i_type;
|
||||
typedef boost::fusion::result_of::deref_data<i_type>::type r_type;
|
||||
BOOST_STATIC_ASSERT((boost::is_same<r_type, int&>::value));
|
||||
}
|
||||
|
||||
return boost::report_errors();
|
||||
}
|
||||
|
||||
Reference in New Issue
Block a user