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An element-wise vector transformation utility function. Similar to JS/TS's map() method on arrays. Change-Id: I4baf52daa918f2e7bf5f9b4af13894fe66826f7c Reviewed-on: https://dawn-review.googlesource.com/c/tint/+/69103 Kokoro: Kokoro <noreply+kokoro@google.com> Commit-Queue: Ben Clayton <bclayton@chromium.org> Reviewed-by: Antonio Maiorano <amaiorano@google.com>
63 lines
2.0 KiB
C++
63 lines
2.0 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_UTILS_TRANSFORM_H_
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#define SRC_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/traits.h"
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namespace tint {
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namespace 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
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/// `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:
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/// `OUT(IN, size_t)`
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/// @returns a new vector with each element of the source vector transformed by
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/// `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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} // namespace utils
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} // namespace tint
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#endif // SRC_UTILS_TRANSFORM_H_
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