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96 lines
2.9 KiB
96 lines
2.9 KiB
// Copyright (c) 2018 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 <memory>
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#include <typeindex>
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#include <typeinfo>
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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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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_ENFORCE(holder_ != nullptr, "Variable must hold some thing");
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PADDLE_ENFORCE(IsType<T>(),
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"Variable must be type %s, the holding type is %s",
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typeid(T).name(), holder_->Type().name());
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return *static_cast<const T*>(holder_->Ptr());
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}
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bool IsInitialized() const { return holder_ != nullptr; }
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template <typename T>
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T* GetMutable() {
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if (!IsType<T>()) {
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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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template <typename T>
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bool IsType() const {
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return holder_ != nullptr &&
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std::type_index(typeid(T)) == std::type_index(holder_->Type());
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}
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void Clear() { holder_.reset(); }
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std::type_index Type() const {
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PADDLE_ENFORCE(holder_ != nullptr, "Must hold memory");
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return holder_->Type();
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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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// name_ is only meaningful with a Scope and accessible by it.
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//
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// NOTE: Please don't expose name_ by adding methods like
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// Variable::Name or Scope::VarName! A variable could have a human
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// readable name or an auto-generated scope-unique name. In the
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// former case, the caller knows the name and doesn't need to access
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// the name; in the latter case, the variable should be identified
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// by its address but not the unreadable name.
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friend class Scope;
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const std::string* name_;
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};
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} // namespace framework
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} // namespace paddle
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