/*
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 *
 * Copyright 2022, Danny Robson <danny@nerdcruft.net>
 */

#pragma once

#include <concepts>
#include <string>
#include <string_view>

namespace cruft::concepts {
    /// A literal c-string character array.
    template <typename T>
    concept c_string =
        std::is_array_v<std::remove_cvref_t<T>> and
        std::is_same_v<
            std::remove_cvref_t<
                std::remove_all_extents_t<
                    std::remove_cvref_t<T>
                >
            >,
            char
        >;

    /// A type that behaves like a string. ie, a sequence of characters
    template <typename T>
    concept stringy =
        std::same_as<T, std::string> or
        std::same_as<T, std::string_view> or
        std::same_as<T, char const*> or
        std::same_as<T, char *> or
        c_string<T>;


    /// A type that behaves like a string _and_ has a null terminator
    template <typename T>
    concept null_stringy =
        std::same_as<T, std::string> or
        std::same_as<T, char const*> or
        std::same_as<T, char      *>;
}