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70 lines
1.6 KiB
70 lines
1.6 KiB
6 years ago
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// Copyright (c) 2019 PaddlePaddle Authors. All Rights Reserved.
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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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#pragma once
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#include <cstdint>
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#include <vector>
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#include "paddle/fluid/platform/enforce.h"
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namespace paddle {
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namespace framework {
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template <typename T, size_t N>
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class InlinedVector {
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static_assert(N > 0, "N must be larger than 0");
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public:
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inline InlinedVector() { len_ = 0; }
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inline size_t size() const { return len_; }
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inline T& operator[](size_t i) { return i < N ? head_[i] : tail_[i - N]; }
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inline const T& operator[](size_t i) const {
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return i < N ? head_[i] : tail_[i - N];
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}
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inline void emplace_back(const T& item) {
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if (LIKELY(len_ < N)) {
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head_[len_++] = item;
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} else {
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tail_.emplace_back(item);
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++len_;
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}
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}
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inline void pop_back() {
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if (UNLIKELY(len_ > N)) {
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tail_.pop_back();
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}
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--len_;
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}
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inline T& back() {
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if (LIKELY(len_ <= N)) {
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return head_[len_ - 1];
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} else {
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return tail_.back();
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}
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}
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private:
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T head_[N];
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size_t len_;
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std::vector<T> tail_;
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};
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} // namespace framework
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} // namespace paddle
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