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/*
Copyright (C) 2014 Paul Davis
Author: David Robillard
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.,
675 Mass Ave, Cambridge, MA 02139, USA.
*/
#ifndef __ardour_variant_h__
#define __ardour_variant_h__
#include <stdint.h>
#include <limits.h>
#include <algorithm>
#include <stdexcept>
#include "ardour/libardour_visibility.h"
#include "pbd/compose.h"
#ifdef COMPILER_MSVC
#undef VOID
#endif
namespace ARDOUR {
/** A value with dynamic type (tagged union). */
class LIBARDOUR_API Variant
{
public:
enum Type {
VOID, ///< Nothing
BOOL, ///< Boolean
DOUBLE, ///< C double (64-bit IEEE-754)
FLOAT, ///< C float (32-bit IEEE-754)
INT, ///< Signed 32-bit int
LONG, ///< Signed 64-bit int
PATH, ///< File path string
STRING, ///< Raw string (no semantics)
URI ///< URI string
};
explicit Variant() : _type(VOID) { _long = 0; }
explicit Variant(bool value) : _type(BOOL) { _bool = value; }
explicit Variant(double value) : _type(DOUBLE) { _double = value; }
explicit Variant(float value) : _type(FLOAT) { _float = value; }
explicit Variant(int32_t value) : _type(INT) { _int = value; }
explicit Variant(int64_t value) : _type(LONG) { _long = value; }
/** Make a variant of a specific string type (string types only) */
Variant(Type type, const std::string& value)
: _type(type)
, _string(value)
{}
/** Make a numeric variant from a double (numeric types only).
*
* If conversion is impossible, the variant will have type VOID.
*/
Variant(Type type, double value)
: _type(type)
{
switch (type) {
case BOOL:
_bool = value != 0.0;
break;
case DOUBLE:
_double = (double)value;
break;
case FLOAT:
_float = (float)value;
break;
case INT:
_int = (int32_t)lrint(std::max((double)INT32_MIN,
std::min(value, (double)INT32_MAX)));
break;
case LONG:
_long = (int64_t)lrint(std::max((double)INT64_MIN,
std::min(value, (double)INT64_MAX)));
break;
default:
_type = VOID;
_long = 0;
}
}
/** Convert a numeric variant to a double. */
double to_double() const {
switch (_type) {
case BOOL: return _bool;
case DOUBLE: return _double;
case FLOAT: return _float;
case INT: return _int;
case LONG: return _long;
default: return 0.0;
}
}
bool get_bool() const { ensure_type(BOOL); return _bool; }
double get_double() const { ensure_type(DOUBLE); return _double; }
float get_float() const { ensure_type(FLOAT); return _float; }
int get_int() const { ensure_type(INT); return _int; }
long get_long() const { ensure_type(LONG); return _long; }
const std::string& get_path() const { ensure_type(PATH); return _string; }
const std::string& get_string() const { ensure_type(STRING); return _string; }
const std::string& get_uri() const { ensure_type(URI); return _string; }
Type type() const { return _type; }
static bool type_is_numeric(Type type) {
switch (type) {
case BOOL: case DOUBLE: case FLOAT: case INT: case LONG:
return true;
default:
return false;
}
}
private:
static const char* type_name(const Type type) {
static const char* names[] = {
"bool", "double", "float", "int", "long", "path", "string", "uri"
};
return names[type];
}
void ensure_type(const Type type) const {
if (_type != type) {
throw std::domain_error(
string_compose("get_%1 called on %2 variant",
type_name(type), type_name(_type)));
}
}
Type _type; ///< Type tag
std::string _string; ///< For all string types (PATH, STRING, URI)
// Union of all primitive numeric types
union {
bool _bool;
double _double;
float _float;
int32_t _int;
int64_t _long;
};
};
} // namespace ARDOUR
#endif // __ardour_variant_h__
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