Edit detail for SandBoxConditionalFunctions revision 1 of 1

Conditional for inner functions in a package.

On 02 Jan 2007 16:44:11 +0100 Francois Maltey wrote:

A *.spad file can contain conditionals such as:

 if R is Integer then
   aFunction x == a definition for integer
 else 
   aFunction x == an other definition

Or conditionals involving has.

But the function aFunction must be an exported function. If aFunction is a local function in the package the test is always false.

So some packages export a lot of local functions, for example elemntry.spad.

)sh EF

 ElementaryFunction(R: Join(Comparable,IntegralDomain),F: Join(FunctionSpace(R),RadicalCategory)) is a package constructor
 Abbreviation for ElementaryFunction is EF 
 This constructor is not exposed in this frame.
------------------------------- Operations --------------------------------

 acos : F -> F                         acosh : F -> F
 acot : F -> F                         acoth : F -> F
 acsc : F -> F                         acsch : F -> F
 asec : F -> F                         asech : F -> F
 asin : F -> F                         asinh : F -> F
 atan : F -> F                         atanh : F -> F
 belong? : BasicOperator -> Boolean    cos : F -> F
 cosh : F -> F                         cot : F -> F
 coth : F -> F                         csc : F -> F
 csch : F -> F                         exp : F -> F
 iiacos : F -> F                       iiacosh : F -> F
 iiacot : F -> F                       iiacoth : F -> F
 iiacsc : F -> F                       iiacsch : F -> F
 iiasec : F -> F                       iiasech : F -> F
 iiasin : F -> F                       iiasinh : F -> F
 iiatan : F -> F                       iiatanh : F -> F
 iicos : F -> F                        iicosh : F -> F
 iicot : F -> F                        iicoth : F -> F
 iicsc : F -> F                        iicsch : F -> F
 iiexp : F -> F                        iilog : F -> F
 iisec : F -> F                        iisech : F -> F
 iisin : F -> F                        iisinh : F -> F
 iisqrt2 : () -> F                     iisqrt3 : () -> F
 iitan : F -> F                        iitanh : F -> F
 localReal? : F -> Boolean             log : F -> F
 pi : () -> F                          sec : F -> F
 sech : F -> F                         sin : F -> F
 sinh : F -> F                         tan : F -> F
 tanh : F -> F                        
 operator : BasicOperator -> BasicOperator
 specialTrigs : (F, List(Record(func: F,pole: Boolean))) -> Union(F,"failed")

all the ixxx functions might be inner functions because they are defined after a conditional.

The file elmentry.spad explains

the following should be local, but are conditional

I can't find any advice about it in the 30-year book.

Where is the problem ? What can aldor do ? Export too much functions complicate the use of axiom.

You can test this very short package for expression -------------------------------------------------------------------

)abbrev package TRYCOND TryConditions

TryConditions (R, F): Exports == Implementation where
  R : Join (OrderedSet, GcdDomain)
  F : Join (FunctionSpace R, TranscendentalFunctionCategory)

  Exports ==> with
    result    : F -> F
    expResult : F -> F

  Implementation ==> add
    iResult : F -> F
    iResult x == cos x
    expResult x == cos x 
    if R is Integer then
      iResult x == sin x
      expResult x == sin x 
    result x == iResult x

   Compiling FriCAS source code from file 
      /var/lib/zope2.10/instance/axiom-wiki/var/LatexWiki/6806777473810003701-25px002.spad
      using old system compiler.
   TRYCOND abbreviates package TryConditions 
------------------------------------------------------------------------
   initializing NRLIB TRYCOND for TryConditions 
   compiling into NRLIB TRYCOND 
****** Domain: R already in scope
****** Domain: F already in scope
   compiling local iResult : F -> F
Time: 0.04 SEC.

   compiling exported expResult : F -> F
Time: 0 SEC.

   compiling local iResult : F -> F
Time: 0 SEC.

   compiling exported expResult : F -> F
Time: 0 SEC.

   compiling exported result : F -> F
Time: 0 SEC.

(time taken in buildFunctor:  0)

;;;     ***       |TryConditions| REDEFINED

;;;     ***       |TryConditions| REDEFINED
Time: 0 SEC.

   Cumulative Statistics for Constructor TryConditions
      Time: 0.04 seconds

   finalizing NRLIB TRYCOND 
   Processing TryConditions for Browser database:
--->-->TryConditions(constructor): Not documented!!!!
--->-->TryConditions((result (F F))): Not documented!!!!
--->-->TryConditions((expResult (F F))): Not documented!!!!
--->-->TryConditions(): Missing Description
; compiling file "/var/aw/var/LatexWiki/TRYCOND.NRLIB/TRYCOND.lsp" (written 04 APR 2022 07:10:35 PM):

; /var/aw/var/LatexWiki/TRYCOND.NRLIB/TRYCOND.fasl written
; compilation finished in 0:00:00.018
------------------------------------------------------------------------
   TryConditions is now explicitly exposed in frame initial 
   TryConditions will be automatically loaded when needed from 
      /var/aw/var/LatexWiki/TRYCOND.NRLIB/TRYCOND

test

-- Expect sin : right
result (sin x)

(1)

-- Expect cos : result sin  
result (sin %i)

   There are 1 exposed and 1 unexposed library operations named result 
      having 1 argument(s) but none was determined to be applicable. 
      Use HyperDoc Browse, or issue
                             )display op result
      to learn more about the available operations. Perhaps 
      package-calling the operation or using coercions on the arguments
      will allow you to apply the operation.

   Cannot find a definition or applicable library operation named 
      result with argument type(s) 
                        Expression(Complex(Integer))

      Perhaps you should use "@" to indicate the required return type, 
      or "$" to specify which version of the function you need.