On Monday, 20 January 2014 at 19:36:13 UTC, Nordlöw wrote:
Has anyone cooked up a generic D struct that groups together min
and max values of a type and default-initializes them in the
correct way?
Something like
struct Limits(T)
{
/* TODO: Fix purity of this by fixing Bytes.value() */
auto init() @trusted /* pure */ nothrow { return
tuple(T.max,
T.min); }
alias _minmax this;
Tuple!(T,T) _minmax;
}
auto limits(T)() { return Limits!T(); }
unittest {
Limits!int x;
dln(x);
}
I want min and max to default initialize to T.max, T.min so they
are prepared for x = min/max(x, ...) arithmetic. But the code
above doesn't work because the init() function isn't called and
I
don't know why. And I can't use default member initialization
because I want `Limits` to work also with types such as
`SysTime`
when min and max are only know at run-time.
I'm aware of `std.datetime.span` but it isn't generic.
Ideas anyone?
import std.stdio;
import std.typecons;
struct Limits(T)
{
auto _minmax = tuple(T.min, T.max);
alias _minmax this;
}
void main()
{
auto a = tuple(int.min, int.max);
a[1] = 2;
writeln(a);
Limits!int x;
writeln(x._minmax);
writeln(x);
x[0] = 1;
writeln(x);
writeln("end");
}
I'm not sure what you want to do.
