gwang

#include <vector>
#include <iostream>
#include <algorithm>

using namespace std;

void printVector(vector<int> & data)
{ 
  cout << "[";
  for (int j = 0; j < data.size(); j++)

gwang

require 'open-uri'
require 'open_uri_redirections'
require 'certified'
require 'json'
require 'pp'

USERNAME = 'gwang'

query = ARGV.first.downcase

gwang

1. When using Cygwin and Codeblocks, the gdb.exe complains that cannot open /cygdrive/c/.../yourfile.cpp. [Refer to this stackoverflow page] (http://stackoverflow.com/questions/18559506/codeblocks-gdb-cannot-open-file-error).
2. You can fix this porblem by: Create a registry key path at HKEY_CURRENT_USER\Software\Cygnus Solutions\Cygwin\ using the New->Key. 3. The under HKEY_CURRENT_USER\Software\Cygnus Solutions\Cygwin\mounts v2 create a string value
3. Name: cygdrive prefix
4. Value: /cygdrive

gwang

1. Refer to this tutorial

2. Commands:

   grub> set pager=1
   grub> ls
   (hd0) (hd0,msdos2) (hd0,msdos1)
   grub> ls (hd0,1)/
   lost+found/ bin/ boot/ cdrom/ dev/ etc/ home/  lib/
   lib64/ media/ mnt/ opt/ proc/ root/ run/ sbin/ 
   

gwang

1. Refer to this link

   1. gvm pkgset create learning
   2. gvm pkgset use learning
   3. gvm pkgset list
   4. edit env gvm pkgenv learning

# original line
export GOPATH; GOPATH="/Users/james/.gvm/pkgsets/go1.2/learning:$GOPATH"
# new edited line

gwang

package main
import "fmt"

// Method inheritance in GoLang is particularly interesting:
// 1. If a struct A has an anonymous field of struct B, then an object of A has all the methods from B.
//    Yes, that means you can call those methods of B directly without referring the field name,
//    just as if those methods are native to A. (Refer to the struct Student in the example below.)
// 2. This does not work if the field is named though. (Refer to the struct Employee case in the
//    example below. )
// 3. Then what happens if A has a method whose name overlaps with one of B's methods?

gwang

// refer to: http://mikespook.com/2012/07/function-call-by-name-in-golang/
func foo() {
    // does something
}

func bar(int i1, int i2, int i3) {
    // does something else. 
}

func Call(m map[string]interface{}, name string, params ... interface{}) (result []reflect.Value, err error) {

gwang

1. Remove a file/directory in the repo but not locally:
   1. git rm --cached filepath
   2. git rm --cached -r directory_path
2. To undo adding a file or directory:
   1. git reset $file_or_dir_name
3. Start a bitbucket repo with existing project in local directory
   1. create a repo with ${repo_name} in bitbucket web
   2. cd your_project_path
   3. git init
   4. git remote add origin [email protected]:${user_name}/${repo_name}.git

gwang

package main
import (
	"fmt"
	"runtime"
)
func main() {
	runtime.GOMAXPROCS(4)
	ch := make(chan int)
	go generate(ch)
	for {

gwang

Problem: after upgrading the Ubuntu guest (running on Windows 7 host) to 15.10, 
1. The full screen mode stopped working; 
2. The shared folder with windows host stopped working; 

Fixes: 
1. Upgraded to virtual box version 5.0.10 (the latest version at the time). 
2. Install VirtualBox Guest Additional as usual 
  # sudo mount /dev/sr0 /media/cdrom
  # cd /media/cdrom
  # sudo ./VBoxLinuxAddtionRun