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Smoke::t_class is now also used for classes not wrapped by Smoke & remove global-space part from enum symbols.
Annotate for file src/overload-resolution.lisp
2009-04-17 tobias
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;;; C++ overload resolution
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;;; See: http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2008/n2800.pdf
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;;;
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;;; We handle only the most common cases. Stuff like virtual inheritance
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;;; that is not needed is not implemented.
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15:26:55 '
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(in-package :smoke)
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(declaim (inline cmp))
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(defun cmp (a b)
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(- a b))
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(declaim (inline strcmp))
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(defcfun strcmp :int (s1 :pointer) (s2 :pointer))
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(declaim (inline cstring/=))
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(defun cstring/= (string1 string2)
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"Returns T when the C strings STRING1 and STRING2 are not equal
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and NIL otherwise."
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(not (zerop (strcmp string1 string2))))
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(defun method-cmp (method class-id name)
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"Compares METHOD to the method with NAME of class CLASS-ID."
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(declare (foreign-pointer name)
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(type (smoke-index 0) class-id)
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(smoke-method method)
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(optimize (speed 3) (debug 0) (safety 0)))
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(let ((id-cmp (cmp (the (smoke-index 0) (method-slot-value method 'class))
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(the (smoke-index 0) class-id))))
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(declare (type smoke-index id-cmp))
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(if (/= 0 id-cmp)
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id-cmp
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(strcmp (smoke-method-name method)
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name))))
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(declaim (inline first-unabigious-index))
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(defun first-unabigious-index (smoke index)
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(declare (type smoke-index index)
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(optimize (speed 3)))
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(if (>= index 0)
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index
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(mem-aref (smoke-module-ambiguous-method-list smoke)
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'smoke-index
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(- index))))
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(defun find-method-for-class (name class)
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"Returns the index of a method with name NAME for class CLASS."
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(declare (type foreign-pointer name)
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(type smoke-class class)
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(optimize (speed 3)))
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(let* ((start 1) ;; 0 is "no method"
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(class-id (id class))
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(smoke (smoke class))
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(end (1+ (smoke-array-length (smoke-module-method-maps smoke)))))
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(declare (type (smoke-index 0) start end)
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(dynamic-extent start))
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(loop until (> start end) do
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(let* ((index (the smoke-index (floor (+ end start) 2)))
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(method (make-smoke-method
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:smoke smoke
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:id (the (smoke-index 0)
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(first-unabigious-index
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smoke
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(foreign-slot-value
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(mem-aref (smoke-array-pointer
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(smoke-module-method-maps
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smoke))
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'smoke-method-map index)
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'smoke-method-map
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'method)))))
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(cmp (the smoke-index (method-cmp method class-id name))))
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(declare (type smoke-index cmp)
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(dynamic-extent method))
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(if (< cmp 0)
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(setf start (1+ index))
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(if (> cmp 0)
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(setf end (1- index))
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(return-from find-method-for-class index))))))
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-1)
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(defmacro push-candidate-method (index name argument-count class methods
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const-p)
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(with-gensyms (method-map method-index method ambig-index i smoke)
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`(let* ((,smoke (smoke ,class))
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(,method-map (mem-aref
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(smoke-array-pointer
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(smoke-module-method-maps ,smoke))
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'smoke-method-map
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(the smoke-index ,index)))
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(,method-index (foreign-slot-value ,method-map 'smoke-method-map 'method))
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(,method (make-smoke-method
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:smoke ,smoke
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:id (first-unabigious-index
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,smoke
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,method-index))))
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(declare (type smoke-index ,method-index))
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(if (cstring/= ,name
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(smoke-method-name ,method))
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nil
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(progn
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(when (= (the smoke-index ,argument-count)
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(the smoke-index (get-arguments-length ,method)))
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(if (< ,method-index 0)
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(let ((,ambig-index (- ,method-index)))
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(declare (type smoke-index ,ambig-index))
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(loop as ,i = (the smoke-index
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(mem-aref (smoke-module-ambiguous-method-list
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,smoke)
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'smoke-index
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,ambig-index))
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while (> (the smoke-index ,i) 0) do
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(incf ,ambig-index)
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(let ((,method (make-smoke-method :smoke ,smoke
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:id ,i)))
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(unless (and ,const-p (not (const-p ,method)))
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(push ,method ,methods)))))
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(unless (and ,const-p (not (const-p ,method)))
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(push ,method ,methods))))
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t)))))
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(defun viable-functions (name argument-count class &optional const-p)
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(declare (optimize (speed 3)))
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(with-foreign-string (name name)
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(let ((methods))
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(let ((smoke (smoke class)))
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(let ((start-index (find-method-for-class name class)))
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(declare (type smoke-index start-index))
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(when (>= start-index 0)
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(loop for index from start-index downto 1
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while (push-candidate-method index name argument-count class
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methods const-p))
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(loop for index from (1+ start-index)
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to (the smoke-index (smoke-array-length
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(smoke-module-method-maps smoke)))
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while (push-candidate-method index name argument-count class
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methods const-p)))))
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methods)))
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(declaim (inline make-conversion make-exact-match make-promotion
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make-number-conversion make-pointer-conversion
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make-boolean-conversion make-user-conversion))
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(defstruct conversion
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(function-name nil :type (or symbol list function) :read-only t)
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(rank -1 :type fixnum :read-only t))
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(defstruct (exact-match (:include conversion (rank 0))))
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(defstruct (promotion (:include conversion (rank 1))))
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(defstruct (number-conversion (:include conversion (rank 2))))
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(defstruct (pointer-conversion (:include conversion (rank 3)))
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(from (find-class t) :type class :read-only t)
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(to (find-class t) :type class :read-only t))
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(defstruct (boolean-conversion (:include conversion (rank 4))))
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(defstruct (user-conversion (:include conversion (rank 5))))
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(defgeneric conversion<= (conversion1 conversion2)
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;; 13.3.3.2 Ranking implicit conversion sequences
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;; 4
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(:method (conversion1 conversion2)
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(declare (optimize (speed 3)))
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(and (not (null conversion1))
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(or (null conversion2)
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(<= (the fixnum (conversion-rank conversion1))
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(the fixnum (conversion-rank conversion2))))))
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(:method ((conversion1 pointer-conversion) (conversion2 pointer-conversion))
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(declare (optimize (speed 3)))
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(if (eq (pointer-conversion-from conversion1)
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(pointer-conversion-from conversion2))
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;; A->B < A->C <=> B subclass of C
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(subtypep (pointer-conversion-to conversion1)
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(pointer-conversion-to conversion2))
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(if (eq (pointer-conversion-to conversion1)
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(pointer-conversion-to conversion2))
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;; B->A < C->A <=> B subclass of C
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(subtypep (pointer-conversion-from conversion1)
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(pointer-conversion-from conversion2))
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nil))))
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'
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(defgeneric conversion= (conversion1 conversion2)
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(:method (conversion1 conversion2)
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(and (conversion<= conversion1 conversion2)
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(conversion<= conversion2 conversion1)))
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(:method ((conversion1 (eql nil)) (conversion2 (eql nil)))
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t))
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(defun max-conversion (conversion1 conversion2)
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"Returns the greater conversion of CONVERSION1 and CONVERSION2."
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(if (null conversion2)
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conversion1
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(if (conversion<= conversion1 conversion2)
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conversion2
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conversion1)))
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(eval-when (:compile-toplevel :load-toplevel :execute)
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(defun conversion-function (name &optional arg)
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(if arg
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`(if (using-typep)
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`(,,name
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(find-class ',(class-name ,arg)))
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#'(lambda (object)
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(funcall (fdefinition ,name)
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object ,arg)))
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`(if (using-typep)
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,name
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(fdefinition ,name)))))
'
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(defmacro make-match (type &optional (name ''identity) (argument nil)
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&rest args)
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`(,(symbolicate 'make- (eval type))
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:function-name ,(conversion-function name argument)
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,@args))
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(defun+using-type get-conversion-sequence object (object type &optional user)
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"Retrains a conversion sequence to convert a instance of type CLASS
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to an instance of type TYPE. When USER is true user conversions are considered."
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(if-let (match (call-using-type exact-match object type))
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(if (eql t match)
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(make-match 'exact-match)
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(make-match 'exact-match match))
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(or (call-using-type promotion object type)
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(call-using-type conversion object type)
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(and user
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(call-using-type user-conversion object type)))))
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(defun+using-types standard-conversion-sequence (method classes &optional user)
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"Returns the conversion sequences to convert the arguments of types CLASSES
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to the types required by METHOD."
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(if (null classes)
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(values (make-match 'exact-match) nil)
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(let ((max-rank)
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(conversions))
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(loop for type in (arguments method)
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for class in classes do
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(let ((rank (call-using-type get-conversion-sequence class type user)))
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(when (null rank)
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(setf max-rank nil)
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(return nil))
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(setf max-rank (max-conversion rank max-rank))
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(push (conversion-function-name rank) conversions)))
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(values max-rank (reverse conversions)))))
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(defun+using-types conversion-sequence (method classes)
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(call-using-types standard-conversion-sequence method classes t))
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(defun+using-types find-best-viable-function (name arguments class
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&optional const-p)
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"Returns the method named NAME of class CLASS that can be called
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using arguments of types TYPES with the lowest conversion sequence."
'
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(call-using-types find-best-viable-function2
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(function-using-types conversion-sequence)
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name arguments class const-p))
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(defun+using-types find-best-viable-function2 (get-sequence name objects class
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&optional const-p)
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(when (and (using-typep)
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(not (typep class 'smoke-standard-class)))
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(throw 'unspecific-type class))
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(let ((viable-functions (viable-functions name (length objects)
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class const-p))
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(best-rank)
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(best-method)
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(conversions))
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(if (null viable-functions)
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(dolist (class (closer-mop:class-direct-superclasses class)
'
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(values best-method nil))
'
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(when (typep class 'smoke-standard-class)
'
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(multiple-value-bind (method conversions)
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(call-using-types find-best-viable-function2 get-sequence name objects class const-p)
'
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(when method
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(return (values method conversions))))))
'
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(loop for method in viable-functions
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finally (return (values best-method conversions)) do
'
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(block next
'
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(multiple-value-bind (rank method-conversions)
'
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(funcall get-sequence method objects)
'
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(when (and rank (conversion<= rank best-rank))
'
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(when (conversion= rank best-rank)
'
282
;; FIXME catch all ambigious overloads
'
283
(if const-p
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(error "Ambigious overload ~A." method)
'
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(when (const-p method)
'
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;; assume that the previous method is a non
'
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;; const one and thus more specific.
'
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(return-from next))))
'
289
(setf best-rank rank)
'
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(setf best-method method)
'
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(setf conversions method-conversions)
'
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(when (and (conversion= rank (make-match 'exact-match))
'
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(not (xor const-p (const-p method))))
'
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(return (values method conversions))))))))))
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(defvar *from-lisp-translations* (make-hash-table :test 'equal))
11:07:39 '
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'
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(defmacro define-from-lisp-translation (type-names lisp-type
'
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&optional
'
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(conversion-function-name 'identity))
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"Defines a translation from LISP-TYPE to the C++ types TYPE-NAMES using
14:11:35 '
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the function CONVERSION-FUNCTION-NAME."
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`(progn ,@(loop for type-name in (ensure-list type-names)
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collect `(setf (gethash ,type-name *from-lisp-translations*)
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#'(lambda (type type-p)
11:49:34 '
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(and (if type-p
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(subtypep type ',lisp-type)
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(typep type ',lisp-type))
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',conversion-function-name))))))
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'
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(define-from-lisp-translation ("void*" "const void*" "void**" "const void**")
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foreign-pointer)
'
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'
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;; FIXME grovel this?
'
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(deftype c-integer (ctype)
'
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(let ((bits (* 8 (foreign-type-size ctype))))
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(if (starts-with-subseq
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(symbol-name :unsigned)
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(symbol-name ctype))
'
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`(unsigned-byte ,bits)
'
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`(signed-byte ,bits))))
'
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'
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'
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(defun+using-type exact-match object (object type)
'
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"Test for an exact match."
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(case (type-id type)
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(0 (when-let (test (gethash (name type) *from-lisp-translations*))
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(funcall test object (using-typep))))
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(1 (object.typep 'boolean))
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(2 (object.typep 'standard-char))
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(3 (object.typep '(c-integer :unsigned-char)))
'
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(4 (object.typep '(c-integer :short)))
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(5 (object.typep '(c-integer :unsigned-short)))
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(6 (object.typep '(c-integer :int)))
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(7 (object.typep '(c-integer :unsigned-int)))
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(8 (object.typep '(c-integer :long)))
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(9 (object.typep '(c-integer :unsigned-long)))
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(10 (object.typep 'single-float))
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(11 (object.typep 'double-float))
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(12 (object.typep 'enum)) ;; FIXME enum-type
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(13 (if (class-p type)
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(and (object.typep 'smoke-standard-object)
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(smoke-type= (get-class type) (object.type-of)))
'
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(when-let (test (gethash (name type) *from-lisp-translations*))
'
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(funcall test object (using-typep)))))))
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'
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(defun make-cleanup-pointer (pointer cleanup-function)
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"Returns a pointer that calls CLEANUP-FUNCTION with pointer as argument
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when it is finalized."
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(let ((address (pointer-address pointer)))
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(tg:finalize pointer #'(lambda ()
'
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(funcall cleanup-function
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(make-pointer address))))))
'
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(defun make-auto-pointer (pointer)
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"Returns a pointer that frees the memory at POINTER when it is finalized."
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(make-cleanup-pointer pointer #'foreign-free))
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(defun coerce-c-string (string)
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(make-auto-pointer (foreign-string-alloc string)))
'
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(defun coerce-enum (enum)
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(cxx-support:value enum))
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(defun coerce-double-float (number)
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(float number 0d0))
'
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'
369
;; FIXME incomplete
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(defun+using-type promotion object (object type)
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(declare (smoke-type type))
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(case (type-id type)
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(0 (when (and (string= (name type) "const char*")
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(object.typep 'string))
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(make-match 'promotion 'coerce-c-string)))
'
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(6 (when (object.typep 'enum)
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(make-match 'promotion 'coerce-enum)))
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(7 (when (object.typep 'enum)
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(make-match 'promotion 'coerce-enum)))
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(11 (when (object.typep 'real)
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(make-match 'promotion 'coerce-double-float)))))
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(declaim (inline coerce-to-class))
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(defun coerce-cast (object to-class)
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(cast object to-class))
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(defun coerce-to-void (object)
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object)
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(defun+using-type conversion-cast object (object type)
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(when (and (class-p type)
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(object.typep 'smoke-standard-object)
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(derived-p (object.type-of) (get-class type))
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(find-smoke-class (get-class type)))
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(make-match 'pointer-conversion
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'coerce-cast
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(find-smoke-class (get-class type))
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:from (object.type-of)
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:to (find-smoke-class (get-class type)))))
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'
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(defun+using-type conversion-void object (object type)
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(when (and (string= (name type) "void*")
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(object.typep 'smoke-standard-object))
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(make-match 'pointer-conversion
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'coerce-void
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nil
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:from (object.type-of)
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:to (find-class 't))))
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'
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(defun+using-type conversion-pointer object (object type)
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;; Not using pointer-p to allow passing a raw pointer for objects on
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;; the stack and references.
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;; (e.g.: for qInstallMsgHandler(QtMsgHandler) )
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;;
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;; FIXME this breaks passing pointers to references.
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;;
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;; e.g.: calling the function foo(QByteArray& foo) with
'
418
;; (foo pointer) assumes pointer to point to a QByteArray, but
'
419
;; actually the conversion sequence QByteArray(pointer) should be
'
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;; used. When pointer is a null pointer it fails horribly!.
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;;
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;; But it is needed for passing the int pointer in QApplication(int&, char**).
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(when (and (or (= 0 (type-id type)) ; voidp
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(= 13 (type-id type))) ; class
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(object.typep 'foreign-pointer))
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(make-match 'pointer-conversion 'identity nil
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:from (find-class 't)
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:to (find-class 't)))) ;; FIXME get the class when applicable
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'
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(defun+using-type conversion object (object type)
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(or (call-using-type conversion-cast object type)
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(call-using-type conversion-void object type)
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(call-using-type conversion-pointer object type)))
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'
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(defun+using-type user-conversion object (object type)
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(or (call-using-type operator-conversion object type)
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(call-using-type constructor-conversion object type)))
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439
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(defun conversion-operator-name (to-type)
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(concatenate 'string
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"operator "
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(if (class-p to-type)
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(name (get-class to-type))
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(name to-type))))
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(defun coerce-to-type (object method)
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(pointer-call method (pointer object)))
'
449
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(defun+using-type operator-conversion object (object type)
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(when (object.typep 'smoke-standard-object)
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(let ((method (find-smoke-method (object.type-of)
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(conversion-operator-name type))))
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(when (valid-p method)
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(if (pointer-p type)
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(make-match 'user-conversion
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'coerce-to-type
'
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method)
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(make-match 'user-conversion
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(lispify (name method) :cxx)))))))
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(declaim (inline coerce-to-class))
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(defun coerce-to-class (object to-class)
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464
(make-instance to-class
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465
:args (list object)))
'
466
'
467
(defun+using-type constructor-conversion object (object type)
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468
(when (class-p type)
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(let ((to-class (find-smoke-class (get-class type) nil)))
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(when (and to-class
'
471
(call-using-types find-best-viable-function2
'
472
(if (using-typep)
'
473
#'standard-conversion-sequence-using-types
'
474
#'standard-conversion-sequence)
'
475
(constructor-name (get-class type))
'
476
(list object) to-class))
'
477
(make-match 'user-conversion
'
478
'coerce-to-class
'
479
to-class)))))
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15:26:55 '
481
(defun call-sequence (method object sequence &rest args)
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482
(s-call method object
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(mapcar #'(lambda (conversion argument)
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484
(funcall conversion argument))
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sequence args)))
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487
(defun format-no-applicable-cxx-method (stream name class arguments)
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(format stream
'
489
"No applicable method ~S of ~A for ~S.
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Candidates are:~{~T~A~%~}."
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name class arguments
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(mapcar #'signature
'
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(viable-functions name
'
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(length arguments)
'
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(smoke-class-of class)))))
'
496
'
497
(define-condition no-applicable-cxx-method (error)
'
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((method :initarg :method :reader condition-method)
'
499
(class :initarg :class :reader condition-class)
'
500
(arguments :initarg :arguments :reader condition-arguments))
'
501
(:report (lambda (condition stream)
'
502
(format-no-applicable-cxx-method stream
'
503
(condition-method condition)
'
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(condition-class condition)
'
505
(condition-arguments condition)))))
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(defun call-using-args (object-or-class name arguments)
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"Calls the method NAME of OBJECT-OR-CLASS with ARGUMENTS."
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(declare (optimize (speed 3))
13:22:32 '
511
(type (or smoke-standard-class smoke-standard-object)
'
512
object-or-class))
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(multiple-value-bind (method sequence)
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(find-best-viable-function name
17:24:36 '
515
arguments
'
516
(smoke-class-of object-or-class)
'
517
(when (typep object-or-class
'
518
'smoke-standard-object)
'
519
(const-p object-or-class)))
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(when (null method)
11:43:13 '
521
(error (make-condition 'no-applicable-cxx-method
'
522
:method name
'
523
:class object-or-class
'
524
:arguments arguments)))
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(if (static-p method)
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526
(apply #'call-sequence method (null-pointer) sequence arguments)
'
527
(apply #'call-sequence method (cast object-or-class (get-class method))
'
528
sequence arguments))))