Trying to use mixin, i get an unsupported char error.

protected template GenMessageGetId(uint id) {
    immutable string GenMessageGetId
        = "public immutable(int) getId() const { \n" ~ id ~ "; \n}";
}

public mixin template Packet(uint id, T...) {
    ...

    private static string buildPacket() {
         ...

         return GenMessageGetId!(id);
    }

    mixin (buildPacket());
}

class MyPacket : Message {
    mixin Packet!(3, ...); -> Error: unsupported char 0x03
}

GenMessageGetId is generating "unsupported char 0x03".

On Tuesday, 22 October 2013 at 15:01:20 UTC, Agustin wrote:
> Trying to use mixin, i get an unsupported char error.
>
> protected template GenMessageGetId(uint id) {
>     immutable string GenMessageGetId
>         = "public immutable(int) getId() const { \n" ~ id ~ "; \n}";
> }
>
> public mixin template Packet(uint id, T...) {
>     ...
>
>     private static string buildPacket() {
>          ...
>
>          return GenMessageGetId!(id);
>     }
>
>     mixin (buildPacket());
> }
>
> class MyPacket : Message {
>     mixin Packet!(3, ...); -> Error: unsupported char 0x03
> }
>
> GenMessageGetId is generating "unsupported char 0x03".

protected template GenMessageGetId(uint id) {
    immutable string GenMessageGetId
        = "public immutable(int) getId() const { \nreturn" ~ id ~ ";
\n}";
}

On Tuesday, 22 October 2013 at 15:01:20 UTC, Agustin wrote:
>         = "public immutable(int) getId() const { \n" ~ id ~ "; \n}";

You'll probably want to convert id to a string there

import std.conv;

 "public immutable(int) getId() const { \n" ~ to!string(id) ~ ";

and also put in return for that function:
 "public immutable(int) getId() const { \n return " ~ to!string(id) ~ ";


and it should compile. What was happening before is string ~ int implicitly converts the int to a char, and cast(char)(3) isn't a printable character, and isn't allowed in D source code.

On Tuesday, 22 October 2013 at 15:01:20 UTC, Agustin wrote:
> Trying to use mixin, i get an unsupported char error.
>
> protected template GenMessageGetId(uint id) {
>     immutable string GenMessageGetId
>         = "public immutable(int) getId() const { \n" ~ id ~ "; \n}";
> }
>
> public mixin template Packet(uint id, T...) {
>     ...
>
>     private static string buildPacket() {
>          ...
>
>          return GenMessageGetId!(id);
>     }
>
>     mixin (buildPacket());
> }
>
> class MyPacket : Message {
>     mixin Packet!(3, ...); -> Error: unsupported char 0x03
> }
>
> GenMessageGetId is generating "unsupported char 0x03".

do you perhaps want to!string(id) ???

On Tuesday, 22 October 2013 at 15:05:16 UTC, Adam D. Ruppe wrote:
> On Tuesday, 22 October 2013 at 15:01:20 UTC, Agustin wrote:
>>        = "public immutable(int) getId() const { \n" ~ id ~ "; \n}";
>
> You'll probably want to convert id to a string there
>
> import std.conv;
>
>  "public immutable(int) getId() const { \n" ~ to!string(id) ~ ";
>
> and also put in return for that function:
>  "public immutable(int) getId() const { \n return " ~ to!string(id) ~ ";
>
>
> and it should compile. What was happening before is string ~ int implicitly converts the int to a char, and cast(char)(3) isn't a printable character, and isn't allowed in D source code.

Works great, thanks! :)

John Colvin:

> do you perhaps want to!string(id) ???

Or:

id.text

Bye,
bearophile

On Tuesday, 22 October 2013 at 15:16:17 UTC, bearophile wrote:
> John Colvin:
>
>> do you perhaps want to!string(id) ???
>
> Or:
>
> id.text
>
> Bye,
> bearophile


I like id.text better than to!string, thanks

On 10/22/2013 08:56 AM, Agustin wrote:

> On Tuesday, 22 October 2013 at 15:16:17 UTC, bearophile wrote:
>> John Colvin:
>>
>>> do you perhaps want to!string(id) ???
>>
>> Or:
>>
>> id.text
>>
>> Bye,
>> bearophile
>
>
> I like id.text better than to!string, thanks

Me too but the following looks nice too:

    id.to!string

Ali