common.h

// Copyright 2017 Kakao Corp. <http://www.kakaocorp.com>
//
// 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 <iostream>
#include <memory>

namespace n2 {

enum class GraphPostProcessing {
    SKIP = 0,
    MERGE_LEVEL0 = 1
};

enum class NeighborSelectingPolicy {
    NAIVE = 0,
    HEURISTIC = 1,
    HEURISTIC_SAVE_REMAINS = 2,
};

enum class DistanceKind {
    UNKNOWN = -1,
    ANGULAR = 0,
    L2 = 1
};

// Source: https://ideone.com/av9b8p

template<typename ... Args>
std::string string_format(const std::string& format, Args ... args){
    size_t size = 1 + snprintf(nullptr, 0, format.c_str(), args ...);
    std::unique_ptr<char[]> buf(new char[size]);
    snprintf(buf.get(), size, format.c_str(), args ...);
    return std::string(buf.get(), buf.get() + size);
}

} // namespace n2