forked from boostorg/utility
457 lines
102 KiB
Plaintext
457 lines
102 KiB
Plaintext
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¬ €ÿÿ ¯ ¬ €ÿÿ €ÿÿ ? Ù Ú % ðE1 ó Ÿ ¨6 Policy Adaptors and the Boost Iterator Adaptor Library Ÿ ¨= David Abrahams, www.boost.org
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Jeremy Siek, Indiana University ª 0 ó Ÿ ¨ Overview Ÿ ¨q Motivation
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Design of the Library
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Implementation of the Library
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Metaprogramming Details
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Policy Adaptors
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Conclusion ¡2 r ? ÌÌÌþ ª ? $ ó Ÿ ¨
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Motivation Ÿ ¨å Container of polymorphic objects
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Use a container of pointers?
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vector<Base*>
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Better: create a wrapper to make it look like a container of objects (not pointers)
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To implement, need an iterator adaptor to dereference the pointer ¡p " “ ® — "
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— ª Ì ó Ÿ ¨
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Motivation Ÿ Ê I t e r a t o r a d a p t o r s a r e e v e r y w h e r e
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V T L M . W e i s e r & G . P o w e l l
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D a t e I t e r a t o r J e f f G a r l a n d
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s t d : : r e v e r s e _ i t e r a t o r
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C h e c k e d _ i t e r B j a r n e S t r o u s t r u p
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S m a r t I t e r a t o r s T . B e c k e r
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C o m p o u n d I t e r a t o r s A . A l e x a n d r e s c u
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M T L & B G L i t e r a t o r s ¡Ž ! Å ! 9 @ ó
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Ÿ ¨
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Motivation Ÿ ¨£ Nonetheless, programmers often give up on the idea of creating a new iterator, instead resorting to rewriting algorithms. Why?
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Building iterators is
|
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Tedious
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Subtle ¡6 • ” þ ó Ÿ ¨
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Motivation Ÿ ¨û Building iterators is tedious
|
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Redundant operators
|
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Prefix and Postfix: ++ --
|
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Dereferencing: * -> []
|
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Comparison: == != < <= > >=
|
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Redundant type information
|
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reference == value_type&
|
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pointer == value_type*
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Constant/mutable iterator interactions ¡È X 0 '
|
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/ ' ó Ÿ ¨
|
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Motivation Ÿ ¨Ë Building iterator adaptors is tedious
|
|||
|
|
Change one aspect of behavior
|
|||
|
|
Leave other aspects the same
|
|||
|
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Aspects:
|
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Movement
|
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Dereference
|
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Equality Comparison
|
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Dist Measurement
|
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Writing dispatching functions is boring ¡r & ; : ( ; : ( ó
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Ÿ ¨
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Motivation Ÿ ¨u Building iterators is hard to get right
|
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operator-> for input iterators
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operator[] for adapted random access iterators ¡L ( N (
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% ó Ÿ ¨ Overview Ÿ ¨Y Motivation
|
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Design of the Library
|
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Implementation of the Library
|
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Policy Adaptors
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Conclusion ¡& Z úúþ: ó Ÿ ¨ Design Ÿ ¨‡ iterator_adaptor class template
|
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User supplies a policy class and Base type
|
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|
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iterator_adaptor generates a model of Random Access Iterator ¡H h + - ó
|
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Ÿ ¨ Design Ÿ
|
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T e m p l a t e p a r a m e t e r s :
|
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B a s e t h e u n d e r l y i n g a d a p t e d t y p e
|
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P o l i c i e s d e f i n e s i m p l e m e n t a t i o n o f c o r e b e h a v i o r s
|
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A s s o c i a t e d T y p e s : V a l u e , R e f e r e n c e , P o i n t e r , a n d C a t e g o r y
|
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S o m e t i m e s d e d u c i b l e f r o m B a s e ( e . g . r e v e r s e _ i t e r a t o r )
|
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B u t n o t a l w a y s ( e . g . , i n d i r e c t _ i t e r a t o r )
|
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¡z ‘ _ ‘ $ ª � a ó Ÿ ¨ Design Ÿ ¨ý Default policies class forwards all operations to the Base type
|
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struct default_iterator_policies {
|
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|
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template <class IterAdaptor>
|
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|
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typename IterAdaptor::reference
|
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|
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dereference(const IterAdaptor& x) const
|
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|
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{ return *x.base(); }
|
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|
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// ...
|
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|
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}; ¡f @ % • “ ® ? ( ¼ ª @ ½ ó Ÿ ¨ Example Use Ÿ ¨ indirect_iterator solves container of pointers problem
|
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|
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|
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struct indirect_iterator_policies
|
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|
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: public default_iterator_policies
|
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|
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{
|
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|
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template <class IterAdaptor>
|
|||
|
|
typename IterAdaptor::reference
|
|||
|
|
dereference(const IterAdaptor& x) const
|
|||
|
|
{ return **x.base(); }
|
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|
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}; ¡N 7 Z ã Z % $ à ª, ^ K o ó # Ÿ ¨ Behavior Delegation Ÿ ª
|
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|
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ó Ÿ ¨ Overview Ÿ ¨Y Motivation
|
|||
|
|
Design of the Library
|
|||
|
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Implementation of the Library
|
|||
|
|
Policy Adaptors
|
|||
|
|
Conclusion ¡& Z ! úúþ ó Ÿ ¨ Implementation Ÿ ¨Ì Redundant public interface reduced to core policies
|
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|
|
|
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|
|
reference operator*() const {
|
|||
|
|
return policies().dereference(*this);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
pointer operator->() const {
|
|||
|
|
return &policies().dereference(*this);
|
|||
|
|
} ¡\ 4 ™ 4 $ I I ó Ÿ ¨ Implementation Ÿ ¨Ü default_iterator_policies forwards behavior to the underlying iterator
|
|||
|
|
|
|||
|
|
template <class IterAdaptor>
|
|||
|
|
typename IterAdaptor::reference
|
|||
|
|
dereference(IterAdaptor& x) {
|
|||
|
|
return *x.base();
|
|||
|
|
}
|
|||
|
|
// more of the same ... ¡b G – , ’ ó Ÿ ¨ Implementation Ÿ ¨§ Constant/mutable iterator interactions should work:
|
|||
|
|
|
|||
|
|
iterator a, b;
|
|||
|
|
const_iterator ca, cb
|
|||
|
|
|
|||
|
|
a == b; a - b
|
|||
|
|
ca == b; ca - cb
|
|||
|
|
a == cb; a - cb;
|
|||
|
|
ca == cb; ca - cb; ¡f 4 t 4 $ & J ªt Y ó " Ÿ ¨ Implementation Ÿ ¨o All four combinations implemented with one function template
|
|||
|
|
|
|||
|
|
template <class B1, class B2, class P, class V1,
|
|||
|
|
class V2, class R1, class R2, class P1,
|
|||
|
|
class P2, class Cat, class Dist>
|
|||
|
|
bool operator==(
|
|||
|
|
iterator_adaptor<B1,Policies,V1,R1,P1,Cat,Dist> x,
|
|||
|
|
iterator_adaptor<B2,Policies,V2,R2,P2,Cat,Dist> y)
|
|||
|
|
{
|
|||
|
|
return x.policies().equal(x.iter(), y.iter());
|
|||
|
|
}
|
|||
|
|
¡T = Z 2 “ ® Z Z < 2 ª ½ ¯ ó Ÿ ¨ Implementation Ÿ T R e d u n d a n t a s s o c i a t e d t y p e s h a n d l e d v i a s m a r t d e f a u l t s
|
|||
|
|
V a l u e t y p e , i t e r a t o r c a t e g o r y , a n d d i f f e r e n c e t y p e o b t a i n e d f r o m s t d : : i t e r a t o r _ t r a i t s < B a s e >
|
|||
|
|
R e f e r e n c e a n d p o i n t e r t y p e : i f V a l u e e x p l i c i t l y s p e c i f i e d t h e n V a l u e & , V a l u e * , o t h e r w i s e u s e s t d : : i t e r a t o r _ t r a i t s < B a s e >
|
|||
|
|
r e m o v e _ c o n s t < V a l u e > ®ð v a l u e _ t y p e ¡œ 6 õ 6 A ] .
|
|||
|
|
ó Ÿ ¨ Implementation Ÿ ¨, Input iterator dereference may return by-value
|
|||
|
|
operator-> would return a pointer to a temporary!
|
|||
|
|
|
|||
|
|
pointer operator->() const {
|
|||
|
|
return &policies().dereference(*this);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
Instead return a proxy object that contains the value and has an operator->.
|
|||
|
|
Proxy has lifetime of the full expression ¡® a Z U Z w Z .
|
|||
|
|
' S B
|
|||
|
|
) ó Ÿ ¨ Implementation Ÿ ¨ô Naïve implementation of operator[]
|
|||
|
|
reference operator[](difference_type n)
|
|||
|
|
{ return *(*this+n); }
|
|||
|
|
Consider a disk-based iterator that reads in and caches the object.
|
|||
|
|
(*this + n) creates a temporary iterator
|
|||
|
|
Safe solution: return by value ¡p # E �
|
|||
|
|
B F = ó Ÿ ¨ Implementation Ÿ ¨§ May need additional state
|
|||
|
|
Example: strided_iterator needs to store stride
|
|||
|
|
Solution: store state in policies class; store instance of policies class in iterator_adaptor ¡: ¨ # d ª, # X $ ó Ÿ ¨ Overview Ÿ ¨Y Motivation
|
|||
|
|
Design of the Library
|
|||
|
|
Implementation of the Library
|
|||
|
|
Policy Adaptors
|
|||
|
|
Conclusion ¡& Z ? úúþ ó Ÿ ¨ Policy Adaptors Ÿ ¨¦ A Design Pattern
|
|||
|
|
Generates new models of a concept (or a family of concepts)
|
|||
|
|
Generates adaptors to selectively modify a behavioral aspect of any model of the concept. ó
|
|||
|
|
Ÿ ¨ Policy Adaptors Ÿ ¨Ñ 1. Identify core aspects of behavior.
|
|||
|
|
For iterators:
|
|||
|
|
Traversal
|
|||
|
|
Dereferencing
|
|||
|
|
Equality comparison
|
|||
|
|
Distance measurement
|
|||
|
|
Associated type exposure
|
|||
|
|
2. Define policy interface that encapsulates the core aspects ¡R : “ ® Z > “ ® : Z = þ ó Ÿ ¨ Policy Adaptors Ÿ 3 . W r i t e d e f a u l t p o l i c i e s c l a s s t h a t d i s p a t c h e s t o c o n c e p t s p u b l i c i n t e r f a c e
|
|||
|
|
|
|||
|
|
4 . B u i l d t h e a d a p t o r c l a s s
|
|||
|
|
G e n e r a l i z e d m o d e l o f c o n c e p t
|
|||
|
|
P a r a m e t e r i z e d o n P o l i c i e s c l a s s a n d B a s e t y p e
|
|||
|
|
P u b l i c i n t e r f a c e d e l e g a t e s w o r k t o P o l i c i e s c l a s s
|
|||
|
|
S t o r e s P o l i c i e s i n s t a n c e a s a d a t a m e m b e r ¡6 j “ ® § ’ " j § ó $ Ÿ ¨ Behavior Delegation Ÿ ª
|
|||
|
|
ó Ÿ ¨ Policy Adaptors Ÿ Ú P o l i c y a d a p t o r d e s i g n p a t t e r n a p p l i c a b l e w h e n :
|
|||
|
|
C o n c e p t h a s m u l t i p l e o r t h o g o n a l a s p e c t s
|
|||
|
|
C o n c e p t s w i t h r i c h i n t e r f a c e ( r e d u n d a n t f u n c t i o n s f o r e a s e o f u s e )
|
|||
|
|
C o n c e p t i s p o p u l a r , i . e . , i t i s a c o m m o n t a s k t o c r e a t e n e w m o d e l s o f t h e c o n c e p t ¡& / ¿ / ¿ ó Ÿ ¨ Overview Ÿ ¨Y Motivation
|
|||
|
|
Design of the Library
|
|||
|
|
Implementation of the Library
|
|||
|
|
Policy Adaptors
|
|||
|
|
Conclusion ¡& Z O
|
|||
|
|
úúþ ó Ÿ ¨
|
|||
|
|
Conclusion Ÿ ¨ÿ Boost Iterator Adaptor Library automates creation of iterators
|
|||
|
|
Factors out functional redundancy
|
|||
|
|
Change one aspect while reusing others
|
|||
|
|
Makes simple ideas easy to implement
|
|||
|
|
Policy adaptors are a powerful design pattern for creating models of rich concepts ¡6 ? I x ? I x ê øÈ ï ` ð z êêê T ëщ ü«@ U[ ¹| Ìÿ3 ` ð ÿÿÌ íᯠ™3 ÊÀâ ßÉw f 3 ™3f ` ð ÿÿÿ êêê ÝÝÝ ²²² MMM ––– ` ð v' êêê H ëщ ü«@ q ÿÿ™ Ì™ ` ð N œ êêê 3 f ëщ ü«@ ˆq» ™Ì €€ ` ð Mj* êêê ED% ëщ ü«@ ¥žy ÿÌ ÌÌ ` ð
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