C/C++ Programming

#include <cstdio>
class SampleClass
{
public:
      SampleClass(const char *announce_string) {
            printf("%s\n", announce_string);
      }
};

SampleClass X("X instantiated");
SampleClass __attribute__ ((init_priority(60000))) Y("Y instantiated");

int
main(void)
{
      return 0;
}

% ./a.out
Y instantiated
X instantiated

class SampleClass
{
public:
      explicit SampleClass(int x, int y = 0);
};

http://weblogs.asp.net/kennykerr/archive/2004/08/31/Explicit-Constructors.aspx
http://blogs.msdn.com/oldnewthing/archive/2006/05/24/605974.aspx

template <typename T>
class BaseClass
{
protected:
      int x_;
};

template <typename T>
class DerivedClass : public BaseClass<T>
{
public:
      void print_x(void) {
            cout << "X = " << this->x_ << endl;
      }
};

Credit: http://ultrahigh.org/2007/05/05/mixing-inheritance-and-templates/

In a statement like this:

      if ((condition1)&&(condition2)){
           ...
      }

if condition1 evaluates to false, then condition2 may not be evaluated.

To print the contents of a buffer in hex:

for (i=0; i < buflen; (cout << hex << setfill('0') << setw(2) << (int(buffer[i++])&0x00ff)));

Need to do some reading on Design Patterns. Also check out Boost libraries.

To measure the execution time of a section of code:

#include <sys/times.h>
#include <cstdlib>

int main(void){

....

const unsigned int TICK_PER_SEC = sysconf(_SC_CLK_TCK);
tms tm;
float start_time, end_time;
times(&tm);
start_time = ((float)(tm.tms_stime+tm.tms_utime))/TICK_PER_SEC;

// Code whose execution time is to be measured
....

times(&tm);
end_time = ((float)(tm.tms_stime+tm.tms_utime))/TICK_PER_SEC;

cout << "Elapsed time = " << (end_time-start_time) << " seconds." << endl;

....

}