Using lambdas in 2.068 becomes painful:

>import std.algorithm;
>
>struct Foo {
>	int baz(int v) {
>		static int id;
>		return v + id++;
>	}
>	void bar() {
>		auto arr1 = [1, 2, 3];
>		auto arr2 = [4, 5, 6];
>		arr1.map!(i =>
>			arr2.map!(j => baz(i + j))
>		);
>	}
>}
>
>void main() {
>}

>Error: pure function 'bug.Foo.bar.__lambda1!int.__lambda1.__lambda2' cannot call impure function 'bug.Foo.baz'

Also after switching to dmd 2.068 I got many stupid errors in lambdas (defined inside class non-static functions):

>Error: need 'this' for '...' of type '...'

I have no idea how to fix it and had to go back to 2.067.

On 8/25/15 9:59 AM, Jack Applegame wrote:
> Using lambdas in 2.068 becomes painful:
>
>> import std.algorithm;
>>
>> struct Foo {
>>     int baz(int v) {
>>         static int id;
>>         return v + id++;
>>     }
>>     void bar() {
>>         auto arr1 = [1, 2, 3];
>>         auto arr2 = [4, 5, 6];
>>         arr1.map!(i =>
>>             arr2.map!(j => baz(i + j))
>>         );
>>     }
>> }
>>
>> void main() {
>> }
>
>> Error: pure function 'bug.Foo.bar.__lambda1!int.__lambda1.__lambda2'
>> cannot call impure function 'bug.Foo.baz'

That seems like a bug, I see no pure in sight there, the compiler shouldn't infer pure if the inferred function is calling impure functions.

> Also after switching to dmd 2.068 I got many stupid errors in lambdas
> (defined inside class non-static functions):
>
>> Error: need 'this' for '...' of type '...'
>
> I have no idea how to fix it and had to go back to 2.067.

Can you post an example?

-Steve

On Tuesday, 25 August 2015 at 14:05:17 UTC, Steven Schveighoffer wrote:
> Can you post an example?

import std.range;
import std.algorithm;

class Foo {
	int baz() {	return 1;}
	void bar() {
		auto s = [1].map!(i => baz()); // compiles
		auto r = [1].map!(i => [1].map!(j => baz())); // Error: need 'this' for 'baz' of type 'int()'
	}
}

On 8/25/15 1:05 PM, Jack Applegame wrote:
> On Tuesday, 25 August 2015 at 14:05:17 UTC, Steven Schveighoffer wrote:
>> Can you post an example?
>
> import std.range;
> import std.algorithm;
>
> class Foo {
>      int baz() {    return 1;}
>      void bar() {
>          auto s = [1].map!(i => baz()); // compiles
>          auto r = [1].map!(i => [1].map!(j => baz())); // Error: need
> 'this' for 'baz' of type 'int()'
>      }
> }


https://issues.dlang.org/show_bug.cgi?id=14962

-Steve

On Tuesday, 25 August 2015 at 18:03:21 UTC, Steven Schveighoffer wrote:
>
>
> https://issues.dlang.org/show_bug.cgi?id=14962
>
> -Steve

Thanks.