How to implement opCmp?
Honey via Digitalmars-d-learn
digitalmars-d-learn at puremagic.com
Fri Jun 9 07:53:13 PDT 2017
Hi everyone!
Given
struct Pair(T, U = T)
{
T f;
U s;
}
what is the intended way to genrically implement opCmp for this
struct?
The naive approach
struct Pair(T, U = T)
{
// [...]
int opCmp(const Pair r) const
{
immutable c = f.opCmp(r.f);
return c != 0 ? c : s.opCmp(r.s);
}
}
yields
Error: no property 'opCmp' for type 'const(int)'
if one tries to compare pairs of int.
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