• John Chapman (7/7) May 25 2020 Is it possible to overload a function template for rectangular
• =?UTF-8?Q?Ali_=c3=87ehreli?= (18/23) May 25 2020 import std.traits;

John Chapman <johnch_atms hotmail.com> writes:

Is it possible to overload a function template for rectangular 
arrays? Is there any way to tell them apart from normal ones?

void foo(T)(T[] a) {}
void foo(T)(T[][] a) {}

auto ra = new int[][](5, 5);
ra.foo(); // matches both

Thanks for any hints.

=?UTF-8?Q?Ali_=c3=87ehreli?= <acehreli yahoo.com> writes:

On 5/25/20 1:20 AM, John Chapman wrote:
 void foo(T)(T[] a) {}
 void foo(T)(T[][] a) {}
 
 auto ra = new int[][](5, 5);
 ra.foo(); // matches both

import std.traits;

void foo(T)(T[] a)
if (!isArray!T) {}

void foo(T)(T[] a)
if (isArray!T) {}

Or you can take T as parameter and check ElementType!T:

import std.traits;
import std.range;

void foo(T)(T a)
if (!isArray!(ElementType!T)) {}

void foo(T)(T a)
if (isArray!(ElementType!T)) {}

void main() {
   auto ra = new int[][](5, 5);
   ra.foo();
}

Ali