Consider the following code to keep track of rectangle positions
on the screen; eg: (1,2)(3,2) ie: (left,top)(right,bottom),
providing get/set properties for one-based positions but only get
properties for zero-based positions:
```d
public struct gudtPosition {
final public void reset() { pintLeft1 = pintTop1 = pintRight1
= pintBottom1 = 0; }
private ushort pintLeft1 = 0;
private ushort pintTop1 = 0;
private ushort pintRight1 = 0;
private ushort pintBottom1 = 0;
final public const ushort left1() { return this.pintLeft1; }
final public const ushort top1() { return this.pintTop1; }
final public const ushort right1() { return this.pintRight1; }
final public const ushort bottom1() { return this.pintBottom1;
}
final public ushort left0() { return this.pintLeft1 = 0 ? 0 :
cast(ushort)(this.pintLeft1 - 1); }
final public ushort top0() { return this.pintTop1 = 0 ? 0 :
cast(ushort)(this.pintTop1 - 1); }
final public ushort right0() { return this.pintRight1 = 0 ? 0
: cast(ushort)(this.pintRight1 - 1); }
final public ushort bottom0() { return this.pintBottom1 = 0 ?
0 : cast(ushort)(this.pintBottom1 - 1); }
final public void left1(const ushort lintPosition) {
this.pintLeft1 = lintPosition; }
final public void top1(const ushort lintPosition) {
this.pintTop1 = lintPosition; }
final public void right1(const ushort lintPosition) {
this.pintRight1 = lintPosition; }
final public void bottom1(const ushort lintPosition) {
this.pintBottom1 = lintPosition; }
final public string caption0() { return /// eg: from (24,24)
to (48,48)
r"from ("c ~
std.format.format(r"%d"c, this.left0) ~
r","c ~
std.format.format(r"%d"c, this.top0) ~
r") to ("c ~
std.format.format(r"%d"c, this.right0) ~
r","c ~
std.format.format(r"%d"c, this.bottom0) ~
r")"c;
}
final public string caption1() { return /// eg: from (24,24)
to (48,48)
r"from ("c ~
std.format.format(r"%d"c, this.pintLeft1) ~
r","c ~
std.format.format(r"%d"c, this.pintTop1) ~
r") to ("c ~
std.format.format(r"%d"c, this.pintRight1) ~
r","c ~
std.format.format(r"%d"c, this.pintBottom1) ~
r")"c;
}
}
```
The code should be, I guess, self-explanatory to read. I do have
some things to learn here on the D-specifics:
- is there a way to unambiguously specify short integers values
like there is for long ones (eg: 1L means 1 long integer like:
long pintSomething = 1L;) ?
- that follows to what seems to be unnecessary castings in my
code snippet; if I write: ushort a = 1; ushort b = 2; ushort c;
why can't I write c = a + b; ? ... DMD refuses the last one
unless I explicitly write: c = cast(ushort) a + b; ... if all the
variables I defined are of the same type ... why should I do have
to cast() them afterwards ?
