mpd/src/config/Param.hxx

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/*
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* Copyright 2003-2017 The Music Player Daemon Project
* http://www.musicpd.org
*
* 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 2 of the License, 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 MPD_CONFIG_PARAM_HXX
#define MPD_CONFIG_PARAM_HXX
#include "check.h"
#include "Compiler.h"
#include <string>
class AllocatedPath;
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struct ConfigParam {
/**
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* The next ConfigParam with the same name. The destructor
* deletes the whole chain.
*/
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ConfigParam *next = nullptr;
std::string value;
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int line;
/**
* This flag is false when nobody has queried the value of
* this option yet.
*/
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bool used = false;
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explicit ConfigParam(int _line=-1)
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:line(_line) {}
gcc_nonnull_all
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explicit ConfigParam(const char *_value, int _line=-1) noexcept
:value(_value), line(_line) {}
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ConfigParam(const ConfigParam &) = delete;
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~ConfigParam();
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ConfigParam &operator=(const ConfigParam &) = delete;
/**
* Determine if this is a "null" instance, i.e. an empty
* object that was synthesized and not loaded from a
* configuration file.
*/
bool IsNull() const {
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return line < 0;
}
/**
* Parse the value as a path. If there is a tilde prefix, it
* is expanded.
*
* Throws #std::runtime_error on error.
*/
AllocatedPath GetPath() const;
};
#endif