176 lines
7.4 KiB
C++
176 lines
7.4 KiB
C++
// Copyright 2021 The Tint Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#ifndef SRC_TINT_UTILS_TRANSFORM_H_
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#define SRC_TINT_UTILS_TRANSFORM_H_
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#include <algorithm>
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#include <type_traits>
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#include <utility>
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#include <vector>
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#include "src/tint/utils/traits.h"
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#include "src/tint/utils/vector.h"
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namespace tint::utils {
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/// Transform performs an element-wise transformation of a vector.
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/// @param in the input vector.
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/// @param transform the transformation function with signature: `OUT(IN)`
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/// @returns a new vector with each element of the source vector transformed by `transform`.
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template <typename IN, typename TRANSFORMER>
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auto Transform(const std::vector<IN>& in, TRANSFORMER&& transform)
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-> std::vector<decltype(transform(in[0]))> {
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std::vector<decltype(transform(in[0]))> result(in.size());
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for (size_t i = 0; i < result.size(); ++i) {
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result[i] = transform(in[i]);
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}
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return result;
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}
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/// Transform performs an element-wise transformation of a vector.
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/// @param in the input vector.
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/// @param transform the transformation function with signature: `OUT(IN, size_t)`
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/// @returns a new vector with each element of the source vector transformed by `transform`.
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template <typename IN, typename TRANSFORMER>
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auto Transform(const std::vector<IN>& in, TRANSFORMER&& transform)
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-> std::vector<decltype(transform(in[0], 1u))> {
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std::vector<decltype(transform(in[0], 1u))> result(in.size());
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for (size_t i = 0; i < result.size(); ++i) {
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result[i] = transform(in[i], i);
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}
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return result;
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}
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/// Transform performs an element-wise transformation of a vector.
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/// @param in the input vector.
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/// @param transform the transformation function with signature: `OUT(IN)`
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/// @returns a new vector with each element of the source vector transformed by `transform`.
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template <typename IN, size_t N, typename TRANSFORMER>
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auto Transform(const Vector<IN, N>& in, TRANSFORMER&& transform)
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-> Vector<decltype(transform(in[0])), N> {
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const auto count = in.Length();
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Vector<decltype(transform(in[0])), N> result;
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result.Reserve(count);
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for (size_t i = 0; i < count; ++i) {
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result.Push(transform(in[i]));
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}
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return result;
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}
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/// Transform performs an element-wise transformation of a vector.
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/// @param in the input vector.
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/// @param transform the transformation function with signature: `OUT(IN, size_t)`
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/// @returns a new vector with each element of the source vector transformed by `transform`.
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template <typename IN, size_t N, typename TRANSFORMER>
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auto Transform(const Vector<IN, N>& in, TRANSFORMER&& transform)
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-> Vector<decltype(transform(in[0], 1u)), N> {
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const auto count = in.Length();
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Vector<decltype(transform(in[0], 1u)), N> result;
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result.Reserve(count);
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for (size_t i = 0; i < count; ++i) {
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result.Push(transform(in[i], i));
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}
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return result;
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}
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/// Transform performs an element-wise transformation of a slice.
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/// @param in the input slice.
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/// @param transform the transformation function with signature: `OUT(IN)`
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/// @tparam N the small-array size of the returned Vector
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/// @returns a new vector with each element of the source vector transformed by `transform`.
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template <size_t N, typename IN, typename TRANSFORMER>
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auto Transform(Slice<IN> in, TRANSFORMER&& transform) -> Vector<decltype(transform(in[0])), N> {
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Vector<decltype(transform(in[0])), N> result;
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result.Reserve(in.len);
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for (size_t i = 0; i < in.len; ++i) {
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result.Push(transform(in[i]));
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}
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return result;
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}
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/// Transform performs an element-wise transformation of a slice.
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/// @param in the input slice.
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/// @param transform the transformation function with signature: `OUT(IN, size_t)`
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/// @tparam N the small-array size of the returned Vector
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/// @returns a new vector with each element of the source vector transformed by `transform`.
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template <size_t N, typename IN, typename TRANSFORMER>
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auto Transform(Slice<IN> in, TRANSFORMER&& transform) -> Vector<decltype(transform(in[0], 1u)), N> {
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Vector<decltype(transform(in[0], 1u)), N> result;
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result.Reserve(in.len);
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for (size_t i = 0; i < in.len; ++i) {
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result.Push(transform(in[i], i));
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}
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return result;
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}
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/// Transform performs an element-wise transformation of a vector reference.
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/// @param in the input vector.
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/// @param transform the transformation function with signature: `OUT(IN)`
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/// @tparam N the small-array size of the returned Vector
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/// @returns a new vector with each element of the source vector transformed by `transform`.
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template <size_t N, typename IN, typename TRANSFORMER>
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auto Transform(VectorRef<IN> in, TRANSFORMER&& transform) -> Vector<decltype(transform(in[0])), N> {
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return Transform<N>(in.Slice(), std::forward<TRANSFORMER>(transform));
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}
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/// Transform performs an element-wise transformation of a vector reference.
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/// @param in the input vector.
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/// @param transform the transformation function with signature: `OUT(IN, size_t)`
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/// @tparam N the small-array size of the returned Vector
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/// @returns a new vector with each element of the source vector transformed by `transform`.
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template <size_t N, typename IN, typename TRANSFORMER>
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auto Transform(VectorRef<IN> in, TRANSFORMER&& transform)
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-> Vector<decltype(transform(in[0], 1u)), N> {
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return Transform<N>(in.Slice(), std::forward<TRANSFORMER>(transform));
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}
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/// TransformN performs an element-wise transformation of a vector, transforming and returning at
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/// most `n` elements.
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/// @param in the input vector.
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/// @param n the maximum number of elements to transform.
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/// @param transform the transformation function with signature: `OUT(IN)`
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/// @returns a new vector with at most n-elements of the source vector transformed by `transform`.
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template <typename IN, typename TRANSFORMER>
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auto TransformN(const std::vector<IN>& in, size_t n, TRANSFORMER&& transform)
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-> std::vector<decltype(transform(in[0]))> {
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const auto count = std::min(n, in.size());
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std::vector<decltype(transform(in[0]))> result(count);
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for (size_t i = 0; i < count; ++i) {
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result[i] = transform(in[i]);
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}
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return result;
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}
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/// TransformN performs an element-wise transformation of a vector, transforming and returning at
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/// most `n` elements.
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/// @param in the input vector.
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/// @param n the maximum number of elements to transform.
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/// @param transform the transformation function with signature: `OUT(IN, size_t)`
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/// @returns a new vector with at most n-elements of the source vector transformed by `transform`.
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template <typename IN, typename TRANSFORMER>
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auto TransformN(const std::vector<IN>& in, size_t n, TRANSFORMER&& transform)
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-> std::vector<decltype(transform(in[0], 1u))> {
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const auto count = std::min(n, in.size());
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std::vector<decltype(transform(in[0], 1u))> result(count);
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for (size_t i = 0; i < count; ++i) {
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result[i] = transform(in[i], i);
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}
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return result;
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}
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} // namespace tint::utils
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#endif // SRC_TINT_UTILS_TRANSFORM_H_
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