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/*
* Copyright 2019 Xilinx Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#pragma once
#include <assert.h>
#include <iostream>
#include <memory>
#include <unordered_map>
namespace vitis {
namespace ai {
template <typename T>
struct WeakSingleton {
static std::weak_ptr<T> the_instance_;
template <typename... Args>
static std::shared_ptr<T> create(Args&&... args) {
std::shared_ptr<T> ret;
if (the_instance_.expired()) {
ret = std::make_shared<T>(std::forward<Args>(args)...);
the_instance_ = ret;
}
ret = the_instance_.lock();
assert(ret != nullptr);
return ret;
}
};
template <typename T>
std::weak_ptr<T> WeakSingleton<T>::the_instance_;
// we don't support c++17 yet.
template <class...>
using my_void_t = void;
template <typename T, class = void>
struct invoke_initialize_if_possible {
static void initialize(T* t) {}
};
template <typename T>
struct WithInjection;
template <typename T>
using is_derived_from_with_injection =
typename std::enable_if<std::is_base_of<WithInjection<T>, T>::value>::type;
template <typename T>
using is_not_derived_from_with_injection =
typename std::enable_if<!std::is_base_of<WithInjection<T>, T>::value>::type;
template <typename T>
struct invoke_initialize_if_possible<T, is_derived_from_with_injection<T>> {
static void initialize(T* t) {
// with_injection<T>::create(...) invokes initialize() already,
// void invoke it twice;
}
};
template <typename T>
struct invoke_initialize_if_possible<
T, my_void_t<decltype(std::declval<T>().initialize()),
// see comment above, otherwise, ambigurous template defined.
is_not_derived_from_with_injection<T>>> {
static void initialize(T* t) { t->initialize(); }
};
template <typename K, typename T>
struct WeakStore {
static std::unordered_map<K, std::weak_ptr<T>> the_store_;
template <typename... Args>
static std::shared_ptr<T> create(const K& key, Args&&... args) {
std::shared_ptr<T> ret;
if (the_store_[key].expired()) {
ret = create_1(std::forward<Args>(args)...);
invoke_initialize_if_possible<T>::initialize(ret.get());
the_store_[key] = ret;
}
ret = the_store_[key].lock();
assert(ret != nullptr);
return ret;
}
private:
template <typename... Args>
static typename std::enable_if<!std::is_constructible<T, Args...>::value,
std::shared_ptr<T>>::type
create_1(Args&&... args) {
return T::create(std::forward<Args>(args)...);
}
template <typename... Args>
static typename std::enable_if<std::is_constructible<T, Args...>::value,
std::shared_ptr<T>>::type
create_1(Args&&... args) {
return std::make_shared<T>(std::forward<Args>(args)...);
}
};
template <typename K, typename T>
std::unordered_map<K, std::weak_ptr<T>> WeakStore<K, T>::the_store_;
} // namespace ai
} // namespace vitis
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