mirror of
https://github.com/NVIDIA/TensorRT-LLM.git
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110 lines
2.8 KiB
C++
110 lines
2.8 KiB
C++
/*
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* Copyright (c) 2024, NVIDIA CORPORATION. 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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*/
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#pragma once
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#include "tensorrt_llm/common/config.h"
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#include <functional>
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#include <memory>
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#include <optional>
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TRTLLM_NAMESPACE_BEGIN
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namespace common
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{
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/**
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* @brief Wrapper that holds an optional reference and integrates with std containers.
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* @details The wrapper uses a std::optional<std::reference_wrapper<T>> at its core.
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When constructed with a unique or shared ptr with a nullptr value, it is interpreted as not holding a value,
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meaning the std::optional of the wrapper object will be false.
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*
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* @tparam T
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*/
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template <typename T>
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class OptionalRef
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{
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private:
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std::optional<std::reference_wrapper<T>> opt;
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public:
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OptionalRef() = default;
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OptionalRef(T& ref)
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: opt(std::ref(ref))
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{
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}
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OptionalRef(std::nullopt_t)
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: opt(std::nullopt)
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{
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}
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OptionalRef(std::shared_ptr<T> const& ptr)
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: opt(ptr ? std::optional<std::reference_wrapper<T>>(std::ref(*ptr)) : std::nullopt)
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{
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}
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// Constructor for std::shared_ptr<std::remove_const_t<T>> when T is const-qualified
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template <typename U = T, typename = std::enable_if_t<std::is_const_v<U>>>
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OptionalRef(std::shared_ptr<std::remove_const_t<T>> const& ptr)
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: opt(ptr ? std::optional<std::reference_wrapper<T>>(std::ref(*ptr)) : std::nullopt)
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{
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}
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OptionalRef(std::unique_ptr<T> const& ptr)
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: opt(ptr ? std::optional<std::reference_wrapper<T>>(std::ref(*ptr)) : std::nullopt)
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{
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}
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// Constructor for std::unique_ptr<std::remove_const_t<T>> when T is const-qualified
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template <typename U = T, typename = std::enable_if_t<std::is_const_v<U>>>
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OptionalRef(std::unique_ptr<std::remove_const_t<T>> const& ptr)
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: opt(ptr ? std::optional<std::reference_wrapper<T>>(std::ref(*ptr)) : std::nullopt)
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{
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}
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T* operator->() const
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{
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return opt ? &(opt->get()) : nullptr;
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}
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T& operator*() const
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{
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return opt->get();
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}
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explicit operator bool() const
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{
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return opt.has_value();
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}
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bool has_value() const
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{
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return opt.has_value();
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}
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T& value() const
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{
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return opt->get();
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}
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};
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} // namespace common
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TRTLLM_NAMESPACE_END
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