bearophile wrote:
Andrei Alexandrescu:
* Encode operators by compile-time strings. For example, instead of the
plethora of opAdd, opMul, ..., we'd have this:
T opBinary(string op)(T rhs) { ... }
The string is "+", "*", etc.
Can you show an example of defining an operator, like a minus, with that?
T opBinary(string op)(T rhs) {
static if (op == "-") return data - rhs.data;
static if (op == "+") return data + rhs.data;
// ... maybe this would work too ...
mixin("return data " ~ op ~ "rhs.data;");
}
I love this syntax over the tons of different operation functions.
Makes it so much nicer, especially when supporting a bunch of different
paramater types (vectors are a good example of this).
T opBinary(string op)(T rhs)
T opBinary(string op)(float[3] rhs)
T opBinary(string op)(float rx, ry, rz)
....
In my set data structure I'd like to define "<=" among two sets as "is subset". Can
that design allow me to overload just <= and >= ? (opCmp is not enough here).
Bye,
bearophile
