Hi,
does anybody know how to bring std.conv.to or something similar to output into an output range?

int a = 42;
char[25] buffer;
to!typeof(buffer[])(a, buffer[]);

I want to send these texts throw sockets. Therefore I'd like to reuse the buffer.

Mafi

On 02/07/2012 02:35 PM, Mafi wrote:
> Hi,
> does anybody know how to bring std.conv.to or something similar to
> output into an output range?
>
> int a = 42;
> char[25] buffer;
> to!typeof(buffer[])(a, buffer[]);
>
> I want to send these texts throw sockets. Therefore I'd like to reuse
> the buffer.
>
> Mafi

You could use std.format.formattedWrite.

import std.exception, std.format, std.stdio;

// I don't know if this already exists somewhere:
struct Filler(T:T[]){
    this(T[] pl){payload = pl;}
    size_t index=0;
    T[] payload;
    void put(const T[] s){
        enforce(payload.length>=index+s.length);
        payload[index..index+s.length]=s;
        index+=s.length;
    }
    void put(char s){
        enforce(payload.length>=index);
        payload[index++]=s;
    }
    @property auto data(){return payload[0..index];}
}
auto filler(T)(T pl){return Filler!T(pl);}

void main(){
    int a = 42;
    char[25] buffer;
    auto f = filler(buffer[]);
    formattedWrite(&f,"%s",a);
    writeln(f.data);
}

On 02/07/2012 04:49 PM, Timon Gehr wrote:
> On 02/07/2012 02:35 PM, Mafi wrote:
>> Hi,
>> does anybody know how to bring std.conv.to or something similar to
>> output into an output range?
>>
>> int a = 42;
>> char[25] buffer;
>> to!typeof(buffer[])(a, buffer[]);
>>
>> I want to send these texts throw sockets. Therefore I'd like to reuse
>> the buffer.
>>
>> Mafi
>
> You could use std.format.formattedWrite.
>
> import std.exception, std.format, std.stdio;
>
> // I don't know if this already exists somewhere:
> struct Filler(T:T[]){
> this(T[] pl){payload = pl;}
> size_t index=0;
> T[] payload;
> void put(const T[] s){
> enforce(payload.length>=index+s.length);
> payload[index..index+s.length]=s;
> index+=s.length;
> }
> void put(char s){

Should be 'void put(T s)'.

> enforce(payload.length>=index);
> payload[index++]=s;
> }
> @property auto data(){return payload[0..index];}
> }
> auto filler(T)(T pl){return Filler!T(pl);}
>
> void main(){
> int a = 42;
> char[25] buffer;
> auto f = filler(buffer[]);
> formattedWrite(&f,"%s",a);
> writeln(f.data);
> }

On 02/07/2012 04:50 PM, Timon Gehr wrote:
> On 02/07/2012 04:49 PM, Timon Gehr wrote:
>> On 02/07/2012 02:35 PM, Mafi wrote:
>>> Hi,
>>> does anybody know how to bring std.conv.to or something similar to
>>> output into an output range?
>>>
>>> int a = 42;
>>> char[25] buffer;
>>> to!typeof(buffer[])(a, buffer[]);
>>>
>>> I want to send these texts throw sockets. Therefore I'd like to reuse
>>> the buffer.
>>>
>>> Mafi
>>
>> You could use std.format.formattedWrite.
>>
>> import std.exception, std.format, std.stdio;
>>
>> // I don't know if this already exists somewhere:
>> struct Filler(T:T[]){
>> this(T[] pl){payload = pl;}
>> size_t index=0;
>> T[] payload;
>> void put(const T[] s){
>> enforce(payload.length>=index+s.length);
>> payload[index..index+s.length]=s;
>> index+=s.length;
>> }
>> void put(char s){
>
> Should be 'void put(T s)'.

Just noticed that this overload is not even necessary.

>
>> enforce(payload.length>=index);
>> payload[index++]=s;
>> }
>> @property auto data(){return payload[0..index];}
>> }
>> auto filler(T)(T pl){return Filler!T(pl);}
>>
>> void main(){
>> int a = 42;
>> char[25] buffer;
>> auto f = filler(buffer[]);
>> formattedWrite(&f,"%s",a);
>> writeln(f.data);
>> }
>

Maybe std.outbuffer...

    auto buffer = new OutBuffer();

    int a = 42;
    buffer.write(a);

    byte[] bytes = cast(byte[]) buffer.toBytes();
    ubyte[] ubytes = buffer.toBytes();


Pedro Lacerda



2012/2/7 Mafi <mafi@example.org>

> Hi,
> does anybody know how to bring std.conv.to or something similar to output
> into an output range?
>
> int a = 42;
> char[25] buffer;
> to!typeof(buffer[])(a, buffer[]);
>
> I want to send these texts throw sockets. Therefore I'd like to reuse the buffer.
>
> Mafi
>

Sorry, I didn't reused the buffer. Hope this helps:

    auto buffer = new OutBuffer();

    int a = 42;
    buffer.write(a);

    byte[] bytes = cast(byte[]) buffer.toBytes();
    ubyte[] ubytes = buffer.toBytes();

    buffer.offset = 0; // cleared
    buffer.write(cast(byte[]) [1,2,0x2]);

Timon, std.outbuffer.OutBuffer looks like your Filler struct.

Pedro Lacerda



2012/2/7 Timon Gehr <timon.gehr@gmx.ch>

> On 02/07/2012 04:50 PM, Timon Gehr wrote:
>
>> On 02/07/2012 04:49 PM, Timon Gehr wrote:
>>
>>> On 02/07/2012 02:35 PM, Mafi wrote:
>>>
>>>> Hi,
>>>> does anybody know how to bring std.conv.to or something similar to
>>>> output into an output range?
>>>>
>>>> int a = 42;
>>>> char[25] buffer;
>>>> to!typeof(buffer[])(a, buffer[]);
>>>>
>>>> I want to send these texts throw sockets. Therefore I'd like to reuse the buffer.
>>>>
>>>> Mafi
>>>>
>>>
>>> You could use std.format.formattedWrite.
>>>
>>> import std.exception, std.format, std.stdio;
>>>
>>> // I don't know if this already exists somewhere:
>>> struct Filler(T:T[]){
>>> this(T[] pl){payload = pl;}
>>> size_t index=0;
>>> T[] payload;
>>> void put(const T[] s){
>>> enforce(payload.length>=index+**s.length);
>>> payload[index..index+s.length]**=s;
>>> index+=s.length;
>>> }
>>> void put(char s){
>>>
>>
>> Should be 'void put(T s)'.
>>
>
> Just noticed that this overload is not even necessary.
>
>
>
>>  enforce(payload.length>=index)**;
>>> payload[index++]=s;
>>> }
>>> @property auto data(){return payload[0..index];}
>>> }
>>> auto filler(T)(T pl){return Filler!T(pl);}
>>>
>>> void main(){
>>> int a = 42;
>>> char[25] buffer;
>>> auto f = filler(buffer[]);
>>> formattedWrite(&f,"%s",a);
>>> writeln(f.data);
>>> }
>>>
>>
>>
>

Am 07.02.2012 16:50, schrieb Timon Gehr:
> On 02/07/2012 04:49 PM, Timon Gehr wrote:
>> On 02/07/2012 02:35 PM, Mafi wrote:
>>> Hi,
>>> does anybody know how to bring std.conv.to or something similar to
>>> output into an output range?
>>>
>>> int a = 42;
>>> char[25] buffer;
>>> to!typeof(buffer[])(a, buffer[]);
>>>
>>> I want to send these texts throw sockets. Therefore I'd like to reuse
>>> the buffer.
>>>
>>> Mafi
>>
>> You could use std.format.formattedWrite.
>>
>> import std.exception, std.format, std.stdio;
>>
>> // I don't know if this already exists somewhere:
>> struct Filler(T:T[]){
>> this(T[] pl){payload = pl;}
>> size_t index=0;
>> T[] payload;
>> void put(const T[] s){
>> enforce(payload.length>=index+s.length);
>> payload[index..index+s.length]=s;
>> index+=s.length;
>> }
>> void put(char s){
>
> Should be 'void put(T s)'.
>
>> enforce(payload.length>=index);
>> payload[index++]=s;
>> }
>> @property auto data(){return payload[0..index];}
>> }
>> auto filler(T)(T pl){return Filler!T(pl);}
>>
>> void main(){
>> int a = 42;
>> char[25] buffer;
>> auto f = filler(buffer[]);
>> formattedWrite(&f,"%s",a);
>> writeln(f.data);
>> }
>

Thanks :) This solution seems to work.
I just wanted to point out that I forgot the ampersand and this was hard to track down. I seemed to work but index wasn't incremented so I always got an empty slice.

Mafi