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									< title > Logtalk built-in method: assertz/1< / title > 
							 
						 
					
						
							
								
									
										
										
										
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									< link  rel = "stylesheet"  href = "../../screen.css"  type = "text/css"  media = "screen" / > 
							 
						 
					
						
							
								
							 
							
								
							 
							
								 
							
							
									< link  rel = "stylesheet"  href = "../../print.css"  type = "text/css"  media = "print" / > 
							 
						 
					
						
							
								
									
										
										
										
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								< div  class = "top-left" > Logtalk reference manual< / div >   
						 
					
						
							
								
							 
							
								
							 
							
								 
							
							
								< div  class = "top-right" > Built-in method: assertz/1< / div >  
						 
					
						
							
								
							 
							
								
							 
							
								 
							
							
								< div  class = "bottom-left" > < span  class = "page" / > < / div >   
						 
					
						
							
								
							 
							
								
							 
							
								 
							
							
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								< div  class = "navtop" > < a  href = "../../index.html" > contents< / a >  >  < a  href = "../index.html" > reference manual< / a >  >  < a  href = "../index.html#methods" > built-in methods< / a > < / div >  
						 
					
						
							
								
									
										
										
										
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								< h2  id = "methods_assertz1"  class = "codenp" > assertz/1< / h2 >  
						 
					
						
							
								
									
										
										
										
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								< h4 > Description< / h4 >  
						 
					
						
							
								
							 
							
								
							 
							
								 
							
							
								
							 
						 
					
						
							
								
									
										
										
										
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								< pre > assertz(Head) 
						 
					
						
							
								
									
										
										
										
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								assertz((Head:-Body))< / pre > 
							 
						 
					
						
							
								
									
										
										
										
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								< p >  
						 
					
						
							
								
							 
							
								
							 
							
								 
							
							
									Asserts a clause as the last one for an object's dynamic predicate. If the predicate is not already declared, then a dynamic predicate declaration is added to the object.
							 
						 
					
						
							
								
							 
							
								
							 
							
								 
							
							
								< / p >  
						 
					
						
							
								
							 
							
								
							 
							
								 
							
							
								
							 
						 
					
						
							
								
							 
							
								
							 
							
								 
							
							
								< h4 > Template and modes< / h4 >  
						 
					
						
							
								
							 
							
								
							 
							
								 
							
							
								
							 
						 
					
						
							
								
									
										
										
										
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								< pre > assertz(+clause)< / pre >  
						 
					
						
							
								
									
										
										
										
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								< h4 > Errors< / h4 >  
						 
					
						
							
								
									
										
										
										
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								< dl >  
						 
					
						
							
								
									
										
										
										
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									< dt > Head is a variable:< / dt > 
							 
						 
					
						
							
								
							 
							
								
							 
							
								 
							
							
										< dd > < code > instantiation_error< / code > < / dd > 
							 
						 
					
						
							
								
							 
							
								
							 
							
								 
							
							
									< dt > Head is a neither a variable nor a callable term:< / dt > 
							 
						 
					
						
							
								
							 
							
								
							 
							
								 
							
							
										< dd > < code > type_error(callable, Head)< / code > < / dd > 
							 
						 
					
						
							
								
							 
							
								
							 
							
								 
							
							
									< dt > Body cannot be converted to a goal:< / dt > 
							 
						 
					
						
							
								
							 
							
								
							 
							
								 
							
							
										< dd > < code > type_error(callable, Body)< / code > < / dd > 
							 
						 
					
						
							
								
							 
							
								
							 
							
								 
							
							
									< dt > The predicate indicator of Head is that of a private predicate:< / dt > 
							 
						 
					
						
							
								
							 
							
								
							 
							
								 
							
							
										< dd > < code > permission_error(modify, private_predicate, Head)< / code > < / dd > 
							 
						 
					
						
							
								
							 
							
								
							 
							
								 
							
							
									< dt > The predicate indicator of Head is that of a protected predicate:< / dt > 
							 
						 
					
						
							
								
							 
							
								
							 
							
								 
							
							
										< dd > < code > permission_error(modify, protected_predicate, Head)< / code > < / dd > 
							 
						 
					
						
							
								
							 
							
								
							 
							
								 
							
							
									< dt > The predicate indicator of Head is that of a static predicate:< / dt > 
							 
						 
					
						
							
								
							 
							
								
							 
							
								 
							
							
										< dd > < code > permission_error(modify, static_predicate, Head)< / code > < / dd > 
							 
						 
					
						
							
								
							 
							
								
							 
							
								 
							
							
								< / dl >  
						 
					
						
							
								
									
										
										
										
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								< h4 > Examples< / h4 >  
						 
					
						
							
								
							 
							
								
							 
							
								 
							
							
								
							 
						 
					
						
							
								
									
										
										
										
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								< dl >  
						 
					
						
							
								
									
										
										
										
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									< dt > To assert a clause as the last one for any dynamic predicate in < a  class = "glossary"  title = "Go to glossary definition"  href = "../../glossary.html#this" > this< / a > :< / dt > 
							 
						 
					
						
							
								
							 
							
								
							 
							
								 
							
							
										< dd > < code > assertz(Clause)< / code > < / dd > 
							 
						 
					
						
							
								
							 
							
								
							 
							
								 
							
							
									< dt > To assert a clause as the last one for any public or protected dynamic predicate in < a  class = "glossary"  title = "Go to glossary definition"  href = "../../glossary.html#self" > self< / a > :< / dt > 
							 
						 
					
						
							
								
							 
							
								
							 
							
								 
							
							
										< dd > < code > ::assertz(Clause)< / code > < / dd > 
							 
						 
					
						
							
								
							 
							
								
							 
							
								 
							
							
									< dt > To assert a clause as the last one for any public dynamic predicate in an object:< / dt > 
							 
						 
					
						
							
								
							 
							
								
							 
							
								 
							
							
										< dd > < code > Object::assertz(Clause)< / code > < / dd > 
							 
						 
					
						
							
								
							 
							
								
							 
							
								 
							
							
								< / dl >  
						 
					
						
							
								
									
										
										
										
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								< div  class = "footer" >  
						 
					
						
							
								
									
										
										
										
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									< div  class = "copyright" > 
							 
						 
					
						
							
								
							 
							
								
							 
							
								 
							
							
										< span > Copyright ©  < a  href = "mailto:pmoura@logtalk.org" > Paulo Moura< / a >  —  < a  href = "http://logtalk.org" > Logtalk.org< / a > < / span > < br / > 	
							 
						 
					
						
							
								
							 
							
								
							 
							
								 
							
							
										< span > Last updated on: October 26, 2006< / span > 
							 
						 
					
						
							
								
							 
							
								
							 
							
								 
							
							
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									< div  class = "navbottom" > 
							 
						 
					
						
							
								
							 
							
								
							 
							
								 
							
							
										< span > < a  href = "asserta1.html" > previous< / a >  | < a  href = "../../glossary.html" > glossary< / a >  | < a  href = "clause2.html" > next< / a > < / span > < br / > 
							 
						 
					
						
							
								
							 
							
								
							 
							
								 
							
							
										< span > < a  href = "http://validator.w3.org/check/referer" > XHTML< / a >  + < a  href = "http://jigsaw.w3.org/css-validator/check/referer" > CSS< / a > < / span > 
							 
						 
					
						
							
								
									
										
										
										
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