On 20/01/16 11:41 PM, chardetm wrote:
Hi everyone,
I was wondering if it was possible to know at compile time if opSlice is
defined for a type, including built-in types like "string". Here is the
code I have:
import std.stdio;
struct Test {
Test opSlice(size_t i, size_t j) {
return this; // We don't care what it returns
}
}
void main () {
string s = "Hello";
auto s2 = s[0..2];
static if (is(typeof(&string.opSlice))) writeln("Ok string");
Test t;
auto t2 = t[0..2];
static if (is(typeof(&Test.opSlice))) writeln("Ok Test");
}
Output:
Ok Test
How to make it work for "string" too (if possible)? And is there a way
to differentiate "opSlice()" from "opSlice(size_t, size_t)" (or
"opSlice(T, T)" for any T)?
Thank you in advance!
template CanSlice(T) {
enum CanSlice = __traits(compiles, {T t; auto v = t[0 .. 1];}) ||
__traits(compiles, {T t; auto v = t.opSlice();});
}
Should work.
