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/*
** Copyright (C) 2023 Dirk-Jan C. Binnema <djcb@djcbsoftware.nl>
**
** This program is free software; you can redistribute it and/or modify it
** under the terms of the GNU General Public License as published by the
** Free Software Foundation; either version 3, or (at your option) any
** later version.
**
** This program 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 this program; if not, write to the Free Software Foundation,
** Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
**
*/
#ifndef MU_OPTION__
#define MU_OPTION__
#include <tl/optional.hpp>
#include <stdexcept>
#include <string>
namespace Mu {
/// Either a value of type T, or None
template <typename T> using Option = tl::optional<T>;
template <typename T>
Option<T>
Some(T&& t)
{
return std::move(t);
}
constexpr auto Nothing = tl::nullopt; // 'None' is already taken.
template<typename T> T
unwrap(Option<T>&& res)
{
if (!!res)
return std::move(res.value());
else
throw std::runtime_error("failure is not an option");
}
/**
* Maybe create a string from a const char pointer.
*
* @param str a char pointer or NULL
*
* @return option with either the string or nothing if str was NULL.
*/
Option<std::string>
static inline to_string_opt(const char* str) {
if (str)
return std::string{str};
else
return Nothing;
}
/**
* Like maybe_string that takes a const char*, but additionally,
* g_free() the string.
*
* @param str char pointer or NULL (consumed)
*
* @return option with either the string or nothing if str was NULL.
*/
Option<std::string> to_string_opt_gchar(char*&& str);
} // namespace Mu
#endif /*MU_OPTION__*/
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