rhumbertgz

hrguez@serenity:~$ lsb_release -a
No LSB modules are available.
Distributor ID:	Ubuntu
Description:	Ubuntu 15.10
Release:	15.10
Codename:	wily
hrguez@serenity:~$ uname -a
Linux serenity 4.2.0-42-generic #49-Ubuntu SMP Tue Jun 28 21:26:26 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux
hrguez@serenity:~$ cat /proc/cpuinfo | grep "model name" | head -n 1
model name	: AMD Opteron(tm) Processor 6376

rhumbertgz

defmodule MacroTest do

 def __using__(_opts) do
    quote do
      import unquote(__MODULE__)
    end
  end
  
  defmacro mymacro(do: block) do
    quote do

rhumbertgz

Reader Macros in Common Lisp

This post also appears on lisper.in.

Reader macros are perhaps not as famous as ordinary macros. While macros are a great way to create your own DSL, reader macros provide even greater flexibility by allowing you to create entirely new syntax on top of Lisp.

Paul Graham explains them very well in [On Lisp][] (Chapter 17, Read-Macros):

The three big moments in a Lisp expression's life are read-time, compile-time, and runtime. Functions are in control at runtime. Macros give us a chance to perform transformations on programs at compile-time. ...read-macros... do their work at read-time.

rhumbertgz

Hello, I have been trying to compile erlang_js with OTP 18.3, but allways I get this message  "Failed to load erlang_js_drv.so".

I tried in Ubunto 14.0.04 and OSX 10.11.4


Erlang log:
======================================================================================


==> erlang_js (eunit)

rhumbertgz

-module(demo_api_pb_service).

-behaviour(riak_api_pb_service).

-export([init/0,
         decode/2,
         encode/1,
         process/2,
         process_stream/3]).

rhumbertgz

Hello, I have an error trying to start riak after compiled it from the source code (riak 2.1.1). 
----------------------------------------
soft67:bin Humberto$ ./riak start
!!!!
!!!! WARNING: ulimit -n is 2560; 65536 is the recommended minimum.
!!!!
riak failed to start within 15 seconds,
see the output of 'riak console' for more information.
If you want to wait longer, set the environment variable
WAIT_FOR_ERLANG to the number of seconds to wait.

rhumbertgz

Hello everyone,

  I have been trying to follow the examples of hooks http://docs.basho.com/riak/2.0.0/dev/using/commit-hooks/, but allways obtained an error (see below).

  I am using Riak 2.0.0
  
These are the commands that I am using.

curl -XPUT -H "Content-Type: application/json" -d '{"props":{"precommit":[{"mod": "validate_demo", "fun": "validate"}]}}' http://127.0.0.1:8090/buckets/demo/props