www.digitalmars.com         C & C++   DMDScript  

digitalmars.D.learn - Problems with stdio.byLine() in D Book

reply Chris A <CodexArcanum gmail.com> writes:
Hey all, I'm going over some examples in Alexandrescu's book, but I guess
something has changed in the language because the example isn't working for me.

The simple example:

void main(string[] args)
{
	uint[string] freqs;
	foreach(lines; stdin.byLine()) {
		foreach(word; split(strip(lines))) {
			++freqs[word.idup];
		}
	}
	foreach(key, value; freqs){
		writefln("%6u\t%s", value, key);
	}
	din.getc();
}


This throws an error during compile, like:
main.d(11): Error: no property 'ByLine' for type '_iobuf'
main.d(11): Error: function expected before (), not 1 of type int
main.d(11): Error: foreach: int is not an aggregate type

So seemingly byLine is no longer an existing function on stdin.  What is the
current version of what this code is trying to do?
Dec 16 2010
next sibling parent reply Andrej Mitrovic <andrej.mitrovich gmail.com> writes:
This works fine for me:

import std.stdio;
import std.string;

void main(string[] args)
{
       uint[string] freqs;
       foreach(lines; stdin.byLine()) {
               foreach(word; split(strip(lines))) {
                       ++freqs[word.idup];
               }
       }
       foreach(key, value; freqs){
               writefln("%6u\t%s", value, key);
       }
        getchar();
}

Perhaps you missed an import

On 12/16/10, Chris A <CodexArcanum gmail.com> wrote:
 Hey all, I'm going over some examples in Alexandrescu's book, but I guess
 something has changed in the language because the example isn't working for
 me.

 The simple example:

 void main(string[] args)
 {
 	uint[string] freqs;
 	foreach(lines; stdin.byLine()) {
 		foreach(word; split(strip(lines))) {
 			++freqs[word.idup];
 		}
 	}
 	foreach(key, value; freqs){
 		writefln("%6u\t%s", value, key);
 	}
 	din.getc();
 }


 This throws an error during compile, like:
 main.d(11): Error: no property 'ByLine' for type '_iobuf'
 main.d(11): Error: function expected before (), not 1 of type int
 main.d(11): Error: foreach: int is not an aggregate type

 So seemingly byLine is no longer an existing function on stdin.  What is the
 current version of what this code is trying to do?

Dec 16 2010
parent Chris A <CodexArcanum gmail.com> writes:
Hmm... maybe my compiler was out of date.  I downloaded DMD again and tried
your code, and it seems to build fine now.  

Sorry for the trouble then, thank you for setting me on the right path Andrej. 


Andrej Mitrovic Wrote:

 This works fine for me:
 
 import std.stdio;
 import std.string;
 
 void main(string[] args)
 {
        uint[string] freqs;
        foreach(lines; stdin.byLine()) {
                foreach(word; split(strip(lines))) {
                        ++freqs[word.idup];
                }
        }
        foreach(key, value; freqs){
                writefln("%6u\t%s", value, key);
        }
         getchar();
 }
 
 Perhaps you missed an import
 
 On 12/16/10, Chris A <CodexArcanum gmail.com> wrote:
 Hey all, I'm going over some examples in Alexandrescu's book, but I guess
 something has changed in the language because the example isn't working for
 me.

 The simple example:

 void main(string[] args)
 {
 	uint[string] freqs;
 	foreach(lines; stdin.byLine()) {
 		foreach(word; split(strip(lines))) {
 			++freqs[word.idup];
 		}
 	}
 	foreach(key, value; freqs){
 		writefln("%6u\t%s", value, key);
 	}
 	din.getc();
 }


 This throws an error during compile, like:
 main.d(11): Error: no property 'ByLine' for type '_iobuf'
 main.d(11): Error: function expected before (), not 1 of type int
 main.d(11): Error: foreach: int is not an aggregate type

 So seemingly byLine is no longer an existing function on stdin.  What is the
 current version of what this code is trying to do?


Dec 16 2010
prev sibling parent Andrej Mitrovic <andrej.mitrovich gmail.com> writes:
Don't forget to bookmark the errata page:
http://erdani.com/tdpl/errata/index.php?title=Main_Page ;)

On 12/16/10, Chris A <CodexArcanum gmail.com> wrote:
 Hmm... maybe my compiler was out of date.  I downloaded DMD again and tried
 your code, and it seems to build fine now.

 Sorry for the trouble then, thank you for setting me on the right path
 Andrej.


 Andrej Mitrovic Wrote:

 This works fine for me:

 import std.stdio;
 import std.string;

 void main(string[] args)
 {
        uint[string] freqs;
        foreach(lines; stdin.byLine()) {
                foreach(word; split(strip(lines))) {
                        ++freqs[word.idup];
                }
        }
        foreach(key, value; freqs){
                writefln("%6u\t%s", value, key);
        }
         getchar();
 }

 Perhaps you missed an import

 On 12/16/10, Chris A <CodexArcanum gmail.com> wrote:
 Hey all, I'm going over some examples in Alexandrescu's book, but I
 guess
 something has changed in the language because the example isn't working
 for
 me.

 The simple example:

 void main(string[] args)
 {
 	uint[string] freqs;
 	foreach(lines; stdin.byLine()) {
 		foreach(word; split(strip(lines))) {
 			++freqs[word.idup];
 		}
 	}
 	foreach(key, value; freqs){
 		writefln("%6u\t%s", value, key);
 	}
 	din.getc();
 }


 This throws an error during compile, like:
 main.d(11): Error: no property 'ByLine' for type '_iobuf'
 main.d(11): Error: function expected before (), not 1 of type int
 main.d(11): Error: foreach: int is not an aggregate type

 So seemingly byLine is no longer an existing function on stdin.  What is
 the
 current version of what this code is trying to do?



Dec 16 2010