to_string.hh

/*
 * Copyright (C) 2015 ScyllaDB
 */

/*
 * This file is part of Scylla.
 *
 * Scylla is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Scylla is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Scylla.  If not, see <http://www.gnu.org/licenses/>.
 */

#pragma once

#include "core/sstring.hh"
#include <vector>
#include <sstream>
#include <unordered_set>
#include <set>
#include <experimental/optional>

#include "seastarx.hh"

template<typename Iterator>
static inline
sstring join(sstring delimiter, Iterator begin, Iterator end) {
    std::ostringstream oss;
    while (begin != end) {
        oss << *begin;
        ++begin;
        if (begin != end) {
            oss << delimiter;
        }
    }
    return oss.str();
}

template<typename PrintableRange>
static inline
sstring join(sstring delimiter, const PrintableRange& items) {
    return join(delimiter, items.begin(), items.end());
}

namespace std {

template<typename Printable>
static inline
sstring
to_string(const std::vector<Printable>& items) {
    return "[" + join(", ", items) + "]";
}

template<typename Printable>
static inline
sstring
to_string(const std::set<Printable>& items) {
    return "{" + join(", ", items) + "}";
}

template<typename Printable>
static inline
sstring
to_string(const std::unordered_set<Printable>& items) {
    return "{" + join(", ", items) + "}";
}

template<typename Printable>
static inline
sstring
to_string(std::initializer_list<Printable> items) {
    return "[" + join(", ", std::begin(items), std::end(items)) + "]";
}

template <typename T>
std::ostream& operator<<(std::ostream& os, const std::unordered_set<T>& items) {
    os << "{" << join(", ", items) << "}";
    return os;
}

template <typename T>
std::ostream& operator<<(std::ostream& os, const std::set<T>& items) {
    os << "{" << join(", ", items) << "}";
    return os;
}

template<typename T, size_t N>
std::ostream& operator<<(std::ostream& os, const std::array<T, N>& items) {
    os << "{" << join(", ", items) << "}";
    return os;
}

namespace experimental {

template <typename T>
std::ostream& operator<<(std::ostream& os, const std::experimental::optional<T>& opt) {
    if (opt) {
        os << "{" << *opt << "}";
    } else {
        os << "{}";
    }
    return os;
}

}

}