There have been some posts about Ada example 19 (both x19a.adb and
xthick19a.adb) causing problems, possibly on 64-bit systems but not
32-bit systems.
Fortunately, example 19 is short.
Unfortunately, example 19 runs fine on my machine, OS X.
Could someone send me detailed info about what happens? On 7/18/08,
Alan indicated this runtime error:
raised STORAGE_ERROR : stack overflow (or erroneous memory access)
This is an Ada exception being raised. Was there a line number
associated with this output?
I would like to try to find, as exactly as possible, where this
problem is arising. Toward that end, I can supply shortened versions
of example 19 with some lines deleted, until we get a version that
runs OK. OTOH, the editing might be easier for someone with a 64-bit
box to do. Ada comments are everything on a line following two
dashes, --. Here is an example of what I would try first. Note that I
have only deleted only the last two calls that create the "northern
view" of the map, leaving the others intact.
Jerry
..... Preliminary Stuff ....., then this...
procedure x19a is
minx, maxx, miny, maxy : Long_Float;
procedure mapform19(n : Integer; x, y : in out Real_Vector);
pragma Convention(C, mapform19);
procedure mapform19(n : Integer; x, y : in out Real_Vector) is
xp, yp, radius : Long_Float;
begin
for i in 0 .. n - 1 loop
radius := 90.0 - y(i);
xp := radius * cos(x(i) * pi / 180.0);
yp := radius * sin(x(i) * pi / 180.0);
x(i) := xp;
y(i) := yp;
end loop;
end mapform19;
begin
-- Parse and process command line arguments
plparseopts(PL_PARSE_FULL);
plinit;
-- Longitude (x) and latitude (y)
miny := -70.0;
maxy := 80.0;
-- Cartesian plots
-- Most of world
minx := 190.0;
maxx := 190.0 + 360.0;
plcol0(1);
plenv(minx, maxx, miny, maxy, 1, -1);
plmap(null, USA_States_and_Continents, minx, maxx, miny, maxy);
-- The Americas
minx := 190.0;
maxx := 340.0;
plcol0(1);
plenv(minx, maxx, miny, maxy, 1, -1);
plmap(null, USA_States_and_Continents, minx, maxx, miny, maxy);
plend;
end x19a;
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