69 lines
2.0 KiB
69 lines
2.0 KiB
/*
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Copyright (c) 2016 PaddlePaddle Authors. All Rights Reserve.
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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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http://www.apache.org/licenses/LICENSE-2.0
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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 <memory>
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#include <typeindex>
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#include <typeinfo>
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#include "paddle/platform/assert.h"
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namespace paddle {
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namespace framework {
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class Variable {
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public:
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template <typename T>
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const T& Get() const {
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PADDLE_ASSERT(holder_ != nullptr);
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PADDLE_ASSERT(std::type_index(typeid(T)) ==
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std::type_index(holder_->Type()));
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return *static_cast<const T*>(holder_->Ptr());
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}
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template <typename T>
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T* GetMutable() {
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if (holder_ == nullptr ||
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std::type_index(typeid(T)) != std::type_index(holder_->Type())) {
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holder_.reset(new PlaceholderImpl<T>(new T()));
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}
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return static_cast<T*>(holder_->Ptr());
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}
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private:
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struct Placeholder {
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virtual ~Placeholder() {}
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virtual const std::type_info& Type() const = 0;
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virtual void* Ptr() const = 0;
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};
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// Placeholder hides type T, so it doesn't appear as a template
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// parameter of Variable.
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template <typename T>
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struct PlaceholderImpl : public Placeholder {
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PlaceholderImpl(T* ptr) : ptr_(ptr), type_(typeid(T)) {}
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virtual const std::type_info& Type() const { return type_; }
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virtual void* Ptr() const { return static_cast<void*>(ptr_.get()); }
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std::unique_ptr<T> ptr_;
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const std::type_info& type_;
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};
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std::unique_ptr<Placeholder>
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holder_; // pointers to a PlaceholderImpl object indeed.
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};
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} // namespace framework
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} // namespace paddle
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