Re: Conversion to output ranges

[Timon Gehr]

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);
}