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How can I check if template variable parameter is iterable before handle it?
Feb 21, 2021
Marcone
Feb 21, 2021
Boris Carvajal
Feb 21, 2021
Marcone
February 21, 2021
Gravatar of MarconePosted by MarconeReply
Marcone
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import std;

void foo(T)(T bar){
	static if (bar.isiterable()) // Need Somethin to check if bar is iterable.
	{
		// Execute it if bar is iterable.
		foreach (i; bar)
		{

		}
	}
	else {
		// Execute it if bar is NOT iterable.
	}

}

void main(){
	foo(1);
	foo([1, 2, 3, 4, 5]);
}
February 21, 2021
Gravatar of Boris CarvajalPosted by Boris Carvajal
in reply to Marcone		Reply
Boris Carvajal
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Posted in reply to Marcone


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On Sunday, 21 February 2021 at 11:58:11 UTC, Marcone wrote:
> import std;
>
> void foo(T)(T bar){
> 	static if (bar.isiterable()) // Need Somethin to check if bar is iterable.
> 	{
> 		// Execute it if bar is iterable.
> 		foreach (i; bar)
> 		{
>
> 		}
> 	}
> 	else {
> 		// Execute it if bar is NOT iterable.
> 	}
>
> }
>
> void main(){
> 	foo(1);
> 	foo([1, 2, 3, 4, 5]);
> }

https://dlang.org/library/std/traits/is_iterable.html

import std.traits : isIterable;

void foo(T)(T bar){
    static if (isIterable!T)
    {
...
February 21, 2021
Gravatar of MarconePosted by Marcone
in reply to Boris Carvajal		Reply
Marcone
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Posted in reply to Boris Carvajal


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On Sunday, 21 February 2021 at 12:47:46 UTC, Boris Carvajal wrote:
> On Sunday, 21 February 2021 at 11:58:11 UTC, Marcone wrote:
>> import std;
>>
>> void foo(T)(T bar){
>> 	static if (bar.isiterable()) // Need Somethin to check if bar is iterable.
>> 	{
>> 		// Execute it if bar is iterable.
>> 		foreach (i; bar)
>> 		{
>>
>> 		}
>> 	}
>> 	else {
>> 		// Execute it if bar is NOT iterable.
>> 	}
>>
>> }
>>
>> void main(){
>> 	foo(1);
>> 	foo([1, 2, 3, 4, 5]);
>> }
>
> https://dlang.org/library/std/traits/is_iterable.html
>
> import std.traits : isIterable;
>
> void foo(T)(T bar){
>     static if (isIterable!T)
>     {
> ...

Thank you.

// Function isiterable()
bool isiterable(T)(T arg) nothrow {try {static if (isIterable!T){return true;} else {return false;}} catch(Throwable){return false;}}