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/* -*- mode: objc; coding: utf-8 -*- */
/* Étoilisp/Mulklisp, a Common Lisp subset for the Étoilé runtime.
* Copyright (C) 2008 Matthias Andreas Benkard.
*
* 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 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, see <http://www.gnu.org/licenses/>.
*/
#import "MLKBinding.h"
#import "runtime-compatibility.h"
#import <Foundation/NSException.h>
#import <Foundation/NSString.h>
static id UNBOUND;
@implementation MLKBinding
+(void) initialize
{
UNBOUND = [[NSObject alloc] init];
}
-(MLKBinding *) init
{
return [self initWithValue:UNBOUND];
}
-(MLKBinding *) initWithValue:(id)something
{
self = [super init];
ASSIGN (value, something);
return self;
}
+(MLKBinding *) binding
{
return AUTORELEASE ([[self alloc] init]);
}
+(MLKBinding *) bindingWithValue:(id)something
{
return AUTORELEASE ([[self alloc] initWithValue:something]);
}
-(void) setValue:(id)something
{
ASSIGN (value, something);
}
-(id) value
{
if (value == UNBOUND)
[NSException raise:@"MLKUnboundVariableError"
format:@""];
return value;
}
-(BOOL) boundp
{
return !(value == UNBOUND);
}
-(void) makunbound
{
ASSIGN (value, UNBOUND);
}
-(void) dealloc
{
RELEASE (value);
[super dealloc];
}
@end
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