Gpc February 2017

gpc@gnu.de

5 participants
3 discussions

strict productions
by Paul Isaacs 01 Mar '17

01 Mar '17

Hello, Is the 10206 spec not strict? 6.8.6.2 Indexed-function-accesses An indexed-function-access shall denote a component of the value of a function-access possessing an array-type or a string-type. indexed-function-access = array-function `[' index-expression { `,' index-expression } `]' j string-function `[' index-expression `]' . array-function = function-access . But: 6.8.6 Function accesses function-access = entire-function-access | component-function-access | substring-function-access . component-function-access = indexed-function-access | record-function-access . entire-function-access = function-designator . And: 6.8.5 Function-designators function-designator = function-name [ actual-parameter-list ] According to the productions an indexed-function-access => array-function => function-access=>indexed-function -access Therefore, the only exit is via entire-function-access. But this would lead to a sentence of the form: x( a,b,c)[ 6,7,8 ] being valid and it is not. From: 6.8.6.2 Indexed-function-accesses An indexed-function-access shall denote a component of the value of a function-access possessing an array-type or a string-type. But this would be an identifier and the function-access productions do not indicate identifiers. Are the productions not strict? Does function-access include identifiers? Regards, Paul Isaacs

3 10

10206 productions re-write
by Paul Isaacs 24 Feb '17

24 Feb '17

Hello, Is the following rewrite correct? variable-access = entire-variable | component-variable | identified-variable | buffer-variable entire-variable = variable-identifier component-variable = indexed-variable | field-designator identified-variable = pointer-variable, '^' buffer-variable = file-variable, '^' indexed-variable = array-variable, `,', index-expression, < `,', index-expression > `]' field-designator = record-variable, ` .', field-specifier | field-designator-identifier array-variable = variable-access record-variable = variable-access pointer-variable = variable-access file-variable = variable-access field-specifier = field-identifier REWRITTEN variable access = entire variable | ( array variable, '[' index expression, < ',', index expression > ']' | record variable, '.' field specifier | field designator identifier | pointer variable, '^' | file variable, '^' | field specifier ), { '^' | '[' index expression, { ',', index expression }, ']' | '.', field specifier | field designator identifier } Thanks, Paul Isaacs

3 4

Two Dimensional Arrays
by Peter 14 Feb '17

14 Feb '17

Hi, Does anyone know the syntax for initializing a dynamic array of more than one dimension? type {$ifdef __GPC__} tMSet (n:CWord) = Array [1..n, 1..n] Of double; {$else} tMSet = Array Of Array Of double; var MSet : tMSet; {$endif} pMSet : ^tMSet; ........ {$ifdef __GPC__} new (pMset, n, n); {$else} SetLength (Mset, n, n); pMSet := @Mset; {$endif} The above works in FPC, but fails in GPC on the "new" with "error: `New' applied to this schema requires 1 discriminant value" This general approach works fine for 1D arrays. Regards, Peter B

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Gpc February 2017