enjoylife

#include <stdlib.h>
#include <stdio.h>
#include <assert.h>

#define CEILING(x,y) (((x) + (y) - 1) / (y))

#define LEADINGBIT(r) ((sizeof(unsigned long int)*8) - __builtin_clzl(r))

#define BITLAST(k,n) ((k) & ((1<<(n))-1)) // for geting subset of bits
#define BITSUBSET(k,m,n) BITLAST((k)>>(m),((n)-(m)))

enjoylife

if [ `date +%w` -eq 6 ]; then
  echo "Enjoy your life. Do not work on Sunday!"
  exit 1
fi
exit 0

enjoylife

files=$(git diff-index --name-only HEAD | grep -P '\.js$')
for file in $files; do
  esvalidate $file
  if [ $? -eq 1 ]; then
    echo "Syntax error: $file"
    exit 1
  fi
done

enjoylife

#include <stdio.h>
#include <math.h>

#ifndef M_PI
#	define M_PI 3.1415926535
#endif
#ifndef ABS
#	define ABS(a) ((a) > 0 ? (a) : -(a))
#endif

enjoylife

/* Stack-based Douglas Peucker line simplification routine 
   returned is a reduced GLatLng array 
   After code by  Dr. Gary J. Robinson,
   Environmental Systems Science Centre,
   University of Reading, Reading, UK
*/

function GDouglasPeucker (source, kink)
/* source[] Input coordinates in GLatLngs 	*/
/* kink	in metres, kinks above this depth kept  */

enjoylife

1. Generate keys on local machine: `ssh-keygen`

2. Create `~/.ssh` directory on remote machine

3. Copy `local:~/.ssh/id_rsa.pub` to `user@remote:~/.ssh/authorized_keys`

  method a) `ssh-copy-id -i ~/.ssh/id_rsa.pub user@host`
  method b) cat .ssh/id_rsa.pub | ssh user@host 'cat >> .ssh/authorized_keys'

enjoylife

a=a|b, b=a^b, a=a^b

//aka
 a=a+b, b=a-b, a=a-b

enjoylife

#define likely(x) __builtin_expect((x),1)
#define unlikely(x) __builtin_expect((x),0)

enjoylife

static inline uint64_t kbi_popcount64(uint64_t y) // standard popcount; from wikipedia
{
	y -= ((y >> 1) & 0x5555555555555555ull);
	y = (y & 0x3333333333333333ull) + (y >> 2 & 0x3333333333333333ull);
	return ((y + (y >> 4)) & 0xf0f0f0f0f0f0f0full) * 0x101010101010101ull >> 56;
}

enjoylife

#include <time.h>

int main()
{
    clock_t tic = clock();

    my_expensive_function_which_can_spawn_threads();

    clock_t toc = clock();