I'm just learning D, so please bear with me if I'm asking
something naive.
Consider the following code skeleton:
// in part A of the application...
//
-------------------------------------------------------------
alias bool function(int n) validator_t;
bool isEven(int n) { ... }
bool isPrime(int n) { ... }
/**
* keeps asking for an int from the user until it passes
* the given validator.
*/
int readInt(string prompt, validator_t validator) { ... }
// in part B of the application which knows nothing about
part A
//
-------------------------------------------------------------
/**
* does something that involves reading an integer from input
*/
void foo(intReader_t reader) { ... }
I'm trying to pass curried versions of `readInt` to `foo`.
Obviously, I don't wish part B to know about the details of a
"reader" nor I'd like to pass `prompt` and `validator` to `foo`
(this really doesn't concern `foo` at all).
I see that the solution is using `partial` from `std.functional`;
for example:
partial!(partial!(readInt, "Enter an integer:"), &isEven)
However, I'm not sure if this is correct (let alone idiomatic!)
and even if this is the correct way of currying `readInt`, what
should be the signature of `foo`?
I'd appreciate any help/hint on this.
