include/openjij/graph/graph.hpp
// Copyright 2023 Jij 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 <cstddef>
#include <random>
#include <vector>
#include <nlohmann/json.hpp>
namespace openjij {
namespace graph {
using Spin = int;
using Spins = std::vector<Spin>;
using Binary = int;
using Binaries = std::vector<Binary>;
using Index = std::size_t;
using Nodes = std::vector<Index>;
/**
* @brief Abstract graph class
*/
class Graph {
private:
const std::size_t _num_spins; /**< total number of spins */
public:
/**
* @brief Graph constructor
*
* @param num_spins total number of spins
*/
explicit Graph(std::size_t num_spins) : _num_spins(num_spins) {}
/**
* @brief generate spins randomly.
*
* @return generated spins
*/
// const Spins gen_spin() const{
template <typename RandomNumberEngine>
const Spins gen_spin(RandomNumberEngine &random_numder_engine) const {
// generate spin array
Spins ret_spin(_num_spins);
std::uniform_int_distribution<> uid(0, 1);
for (auto &elem : ret_spin) {
elem = 2 * uid(random_numder_engine) - 1;
}
return ret_spin;
}
/**
* @brief generate spins randomly.
*
* @return generated spins
*/
template <typename RandomNumberEngine>
const Binaries gen_binary(RandomNumberEngine &random_numder_engine) const {
// generate binary array
Binaries ret_binary(_num_spins);
std::uniform_int_distribution<> uid(0, 1);
for (auto &elem : ret_binary) {
elem = uid(random_numder_engine);
}
return ret_binary;
}
/**
* @brief get number of spins
* @deprecated please use size()
*
* @return number of spins
*/
std::size_t get_num_spins() const noexcept { return _num_spins; }
/**
* @brief get number of spins
*
* @return number of spins
*/
std::size_t size() const noexcept { return _num_spins; }
};
} // namespace graph
} // namespace openjij