[SCM] gawk branch, feature/bool, updated. gawk-4.1.0-4254-ga98f6b5

[Arnold Robbins]

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http://git.sv.gnu.org/cgit/gawk.git/commit/?id=a98f6b507ed2d540ee214cf1f9eb3487a542fd18

commit a98f6b507ed2d540ee214cf1f9eb3487a542fd18
Author: Arnold D. Robbins <arnold@skeeve.com>
Date:   Thu Mar 18 21:06:15 2021 +0200

    Update to bool.notes.

diff --git a/bool.notes b/bool.notes
index df3ec69..8e24c2b 100644
--- a/bool.notes
+++ b/bool.notes
@@ -1,30 +1,31 @@
-Fri Mar  5 13:42:44 IST 2021
+Thu Mar 18 21:05:29 IST 2021
 ============================
 
 Design Notes for a Boolean Type in Gawk
 
-1. At first glance, two new variables named TRUE and FALSE would make sense
-to be predefined values of boolean type.  However, since it's likely that
-many awk programs already use them, instead we'll add two new entries
-to PROCINFO: variables PROCINFO["true"] and PROCINFO["false"] of type bool.
+1. A new function  bool(val)  converts val to bool, returning Boolean TRUE
+or FALSE.  This is the generator for boolean values and is enough to have
+instead of predefining new variables TRUE and FALSE.
 
-Assigning from them copies the bool type, thus they are "factories" of bool
-variables.
+2. Assigning from a boolean value copies the bool type.
 
-2. They have numeric values 1 and 0 respectively, and string values
-"TRUE" and "FALSE".  Thus they differ from other variables where a
+3. Boolean variables have numeric values 1 and 0 respectively, and string
+values "TRUE" and "FALSE".  Thus they differ from other variables where a
 "false" value must be zero and null.
 
-This implies all of the following:
+Given:
 
-       print(PROCINFO["true"]) --> "TRUE"
-       print(PROCINFO["false"]) --> "FALSE"
+       true = bool(1)
+       false = bool(0)
+
+this implies all of the following:
+
+       print(true) --> "TRUE"
+       print(false) --> "FALSE"
        Same for %s in printf
        Same for bool_var ""
        printf %d gives 0/1
 
-3. Function  bool(val)  converts val to bool, returning Boolean TRUE or FALSE.
-
 4. typeof() returns "bool".
 
 5. Numeric operators treat booleans as numbers.  asort() sorts booleans before

-----------------------------------------------------------------------

Summary of changes:
 bool.notes | 29 +++++++++++++++--------------
 1 file changed, 15 insertions(+), 14 deletions(-)


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