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digitalmars.D.learn - Conversion to output ranges

reply Mafi <mafi example.org> writes:
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
Feb 07 2012
next sibling parent reply Timon Gehr <timon.gehr gmx.ch> writes:
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); }
Feb 07 2012
parent reply Timon Gehr <timon.gehr gmx.ch> writes:
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);
 }

Feb 07 2012
next sibling parent reply Timon Gehr <timon.gehr gmx.ch> writes:
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);
 }


Feb 07 2012
parent Pedro Lacerda <pslacerda gmail.com> writes:
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);
 }



Feb 07 2012
prev sibling parent Mafi <mafi example.org> writes:
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
Feb 08 2012
prev sibling parent Pedro Lacerda <pslacerda gmail.com> writes:
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

Feb 07 2012