• Atila Neves (8/8) Mar 25 2016 int delegate(int) dg = (i) => i * 2;
• data pulverizer (14/22) Mar 25 2016 Hmm, looks like your first delegate is a function type and the
• data pulverizer (3/33) Mar 25 2016 In fact for the second case I'd probably need to see a working

Atila Neves <atila.neves gmail.com> writes:

int delegate(int) dg = (i) => i * 2;

Error: non-constant nested delegate literal expression __lambda3


int delegate(int) dg;

static this() {
    dg = i => i * 2; // ok
}


Am I doing anything wrong?

Atila

data pulverizer <data.pulverizer gmail.com> writes:

On Friday, 25 March 2016 at 20:54:28 UTC, Atila Neves wrote:
 int delegate(int) dg = (i) => i * 2;

 Error: non-constant nested delegate literal expression __lambda3


 int delegate(int) dg;

 static this() {
    dg = i => i * 2; // ok
 }


 Am I doing anything wrong?

 Atila

Hmm, looks like your first delegate is a function type and the 
second is a function instance. So the first version written like 
this ...

import std.stdio;

alias dg = int delegate(int);

dg make_dg(){
	return i => i*2;
}

void main(){
	auto my_dg = make_dg();
	writeln(my_dg(3));
}

will work.

data pulverizer <data.pulverizer gmail.com> writes:

On Friday, 25 March 2016 at 23:40:37 UTC, data pulverizer wrote:
 On Friday, 25 March 2016 at 20:54:28 UTC, Atila Neves wrote:
 int delegate(int) dg = (i) => i * 2;

 Error: non-constant nested delegate literal expression 
 __lambda3


 int delegate(int) dg;

 static this() {
    dg = i => i * 2; // ok
 }


 Am I doing anything wrong?

 Atila

 Hmm, looks like your first delegate is a function type and the 
 second is a function instance. So the first version written 
 like this ...

 import std.stdio;

 alias dg = int delegate(int);

 dg make_dg(){
 	return i => i*2;
 }

 void main(){
 	auto my_dg = make_dg();
 	writeln(my_dg(3));
 }

 will work.

In fact for the second case I'd probably need to see a working 
struct/class prototype to make a firm comment on it.