GCC Code Coverage Report


Directory: gridformat/
File: gridformat/common/field.hpp
Date: 2024-11-20 14:41:59
Exec Total Coverage
Lines: 67 67 100.0%
Functions: 104 302 34.4%
Branches: 289 1178 24.5%

Line Branch Exec Source
1 // SPDX-FileCopyrightText: 2022-2023 Dennis Gläser <dennis.glaeser@iws.uni-stuttgart.de>
2 // SPDX-License-Identifier: MIT
3 /*!
4 * \file
5 * \ingroup Common
6 * \copydoc GridFormat::Field
7 */
8 #ifndef GRIDFORMAT_COMMON_FIELD_HPP_
9 #define GRIDFORMAT_COMMON_FIELD_HPP_
10
11 #include <memory>
12 #include <cstddef>
13 #include <concepts>
14 #include <type_traits>
15 #include <utility>
16 #include <ranges>
17 #include <cmath>
18
19 #include <gridformat/common/md_layout.hpp>
20 #include <gridformat/common/precision.hpp>
21 #include <gridformat/common/serialization.hpp>
22 #include <gridformat/common/type_traits.hpp>
23 #include <gridformat/common/exceptions.hpp>
24 #include <gridformat/common/concepts.hpp>
25 #include <gridformat/common/ranges.hpp>
26
27 namespace GridFormat {
28
29 //! \addtogroup Common
30 //! \{
31
32 /*!
33 * \brief Abstract interface for fields of values that is used by writers/readers to store fields.
34 * \details Allows you to obtain information on the layout of the field, the precision of its value type,
35 * and to retrieve its values in serialized form or to export them into containers.
36 */
37 class Field {
38 public:
39 //! Can be used as a flag to disable resizing upon export (e.g. to write to the beginning of larger range)
40 static constexpr struct DisableResize {} no_resize{};
41
42 622398 virtual ~Field() = default;
43
44 159852 Field() = default;
45 151344 Field(Field&&) = default;
46 Field(const Field&) = delete;
47 Field& operator=(Field&&) = default;
48 Field& operator=(const Field&) = delete;
49
50 //! Return the layout of this field
51 1061806 MDLayout layout() const {
52 1061806 return _layout();
53 }
54
55 //! Return the precision of the scalar field values
56 548320 DynamicPrecision precision() const {
57 548320 return _precision();
58 }
59
60 //! Return the size of all field values in serialized form
61 185017 std::size_t size_in_bytes() const {
62
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185017 return layout().number_of_entries()*precision().size_in_bytes();
63 }
64
65 //! Return the field values in serialized form
66 163336 Serialization serialized() const {
67 163336 auto result = _serialized();
68
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163336 if (result.size() != size_in_bytes())
69
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1 throw SizeError("Serialized size does not match expected number of bytes");
70 163335 return result;
71 1 }
72
73 //! Visit the scalar values of the field in the form of an std::span
74 template<typename Visitor>
75 97919 decltype(auto) visit_field_values(Visitor&& visitor) const {
76
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146880 return precision().visit([&] <typename T> (const Precision<T>&) {
77
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48961 const auto serialization = serialized();
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97922 return visitor(serialization.template as_span_of<T>());
79 146880 });
80 }
81
82 //! Export the field values into the provided range, resize if necessary, and return it
83 template<std::ranges::range R> requires(Concepts::Scalar<MDRangeValueType<R>>)
84 17513 decltype(auto) export_to(R&& output_range) const {
85 17513 return _export_to<true>(std::forward<R>(output_range));
86 }
87
88 //! Export the field values into the provided range without resizing (given range must be large enough)
89 template<std::ranges::range R> requires(Concepts::Scalar<MDRangeValueType<R>>)
90 2 decltype(auto) export_to(R&& output_range, DisableResize) const {
91 2 return _export_to<false>(std::forward<R>(output_range));
92 }
93
94 //! Export the field as a scalar (works only if the field is a scalar field)
95 template<Concepts::Scalar S>
96 6453 void export_to(S& out) const {
97
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6453 const auto my_layout = layout();
98
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6453 const auto serialization = serialized();
99
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6453 if (my_layout.number_of_entries() != 1)
100
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2 throw TypeError("Field cannot be exported into a scalar");
101
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13073 visit_field_values([&] <typename T> (std::span<const T> data) {
102 3254 out = static_cast<S>(data[0]);
103 });
104 6455 }
105
106 //! Export the field as a scalar (works only if the field is a scalar field)
107 template<Concepts::Scalar S>
108 6383 S export_to() const {
109 S out;
110
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6383 export_to(out);
111 6382 return out;
112 }
113
114 //! Export the field into a resizable range (e.g. std::vector)
115 template<Concepts::ResizableMDRange R>
116 requires(Concepts::StaticallySizedMDRange<std::ranges::range_value_t<R>> or
117 Concepts::Scalar<std::ranges::range_value_t<R>>)
118 16412 R export_to() const {
119
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16412 return export_to(R{});
120 }
121
122 private:
123 DynamicPrecision _prec;
124
125 virtual MDLayout _layout() const = 0;
126 virtual DynamicPrecision _precision() const = 0;
127 virtual Serialization _serialized() const = 0;
128
129 //! Export the field values into the provided range and return it
130 template<bool enable_resize, std::ranges::range R> requires(Concepts::Scalar<MDRangeValueType<R>>)
131 17517 decltype(auto) _export_to(R&& output_range) const {
132
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17517 const auto my_layout = layout();
133
134 if constexpr (Concepts::ResizableMDRange<R> && enable_resize) {
135
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17157 const auto num_scalars = my_layout.number_of_entries();
136
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17157 const auto num_sub_scalars = get_md_layout<std::ranges::range_value_t<R>>().number_of_entries();
137
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17157 if (num_scalars%num_sub_scalars != 0)
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6 throw TypeError(
139 "Cannot export the field into the given range type. "
140 "Number of entries in the field is not divisible by the "
141 "number of entries in the value_type of the provided range."
142 );
143
144
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17151 output_range.resize(
145 num_scalars/num_sub_scalars,
146
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17151 DefaultValue<std::ranges::range_value_t<R>>::get()
147 );
148 } else {
149
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360 const auto output_range_layout = get_md_layout(output_range);
150
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360 if (output_range_layout.number_of_entries() < my_layout.number_of_entries())
151
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4 throw SizeError(
152
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4 std::string{"Cannot fill the given range. Too few entries. "} +
153
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8 "Number of field entries: '" + std::to_string(my_layout.number_of_entries()) + "'; " +
154
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8 "Number of range entries: '" + std::to_string(output_range_layout.number_of_entries()) + "'"
155 );
156 360 }
157
158 17509 std::size_t offset = 0;
159
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35093 visit_field_values([&] <typename T> (std::span<const T> data) {
160 8767 _export_to(output_range, data, offset);
161 });
162
163 35018 return std::forward<R>(output_range);
164 17517 }
165
166 template<std::ranges::range R, Concepts::Scalar T>
167 55042 void _export_to(R& range,
168 std::span<const T> data,
169 std::size_t& offset) const {
170 if constexpr (mdrange_dimension<R> > 1)
171
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38574 std::ranges::for_each(range, [&] (std::ranges::range auto& sub_range) {
172 18754 _export_to(sub_range, data, offset);
173 });
174 else
175
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53976 std::ranges::for_each_n(
176 std::ranges::begin(range),
177
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53976 std::min(Ranges::size(range), data.size() - offset),
178 566554 [&] <typename V> (V& value) {
179 283277 value = static_cast<V>(data[offset++]);
180 }
181 );
182 55042 }
183 };
184
185 //! Pointer type used by writers/readers for fields
186 using FieldPtr = std::shared_ptr<const Field>;
187
188 //! Factory function for field pointers
189 template<typename F> requires(
190 std::derived_from<std::remove_cvref_t<F>, Field> and
191 !std::is_lvalue_reference_v<F>)
192 151344 FieldPtr make_field_ptr(F&& f) {
193
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151344 return std::make_shared<std::add_const_t<F>>(std::forward<F>(f));
194 }
195
196 //! \} group Common
197
198 } // namespace GridFormat
199
200 #endif // GRIDFORMAT_COMMON_FIELD_HPP_
201