data_type.h

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/*
 * Copyright (C) 2006-2011 David Robillard <d@drobilla.net>
 * Copyright (C) 2007-2011 Carl Hetherington <carl@carlh.net>
 * Copyright (C) 2007-2015 Paul Davis <paul@linuxaudiosystems.com>
 *
 * 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.
 */
 
#pragma once
 
#include <string>
#include <stdint.h>
#include <glib.h>
 
#include "ardour/libardour_visibility.h"
 
namespace ARDOUR {
 
class LIBARDOUR_API DataType
{
public:
        enum Symbol {
                AUDIO = 0,
                MIDI = 1,
                NIL = 2,
        };
 
        static const uint32_t num_types = 2;
 
        DataType(const Symbol& symbol)
        : _symbol(symbol)
        {}
 
        static DataType front() { return DataType((Symbol) 0); }
 
        DataType(const std::string& str)
        : _symbol(NIL) {
                if (!g_ascii_strncasecmp(str.c_str(), "audio", str.length())) {
                        _symbol = AUDIO;
                } else if (!g_ascii_strncasecmp(str.c_str(), "midi", str.length())) {
                        _symbol = MIDI;
                }
        }
 
        const char* to_string() const {
                switch (_symbol) {
                case AUDIO: return "audio";
                case MIDI:  return "midi";
                default:    return "unknown"; // reeeally shouldn't ever happen
                }
        }
 
        const char* to_i18n_string () const;
 
        inline operator uint32_t() const { return (uint32_t)_symbol; }
 
        class iterator {
        public:
 
                iterator(uint32_t index) : _index(index) {}
 
                DataType  operator*()  { return DataType((Symbol)_index); }
                iterator& operator++() { ++_index; return *this; } // yes, prefix only
                bool operator==(const iterator& other) { return (_index == other._index); }
                bool operator!=(const iterator& other) { return (_index != other._index); }
 
        private:
                friend class DataType;
 
                uint32_t _index;
        };
 
        static iterator begin() { return iterator(0); }
        static iterator end()   { return iterator(num_types); }
 
        bool operator==(const Symbol symbol) { return (_symbol == symbol); }
        bool operator!=(const Symbol symbol) { return (_symbol != symbol); }
 
        bool operator==(const DataType other) { return (_symbol == other._symbol); }
        bool operator!=(const DataType other) { return (_symbol != other._symbol); }
 
private:
        Symbol _symbol; // could be const if not for the string constructor
};
 
 
} // namespace ARDOUR