C++ Threads(Hilos)

C++ Thread

Ejemplo de como implementar threads con la libreria thread en c++

El programa debe calcular el area de circulos y triangulos por separado.

/* Version g++ 4.6.3 - Linux/Ubuntu 12.04
 * Compilacion g++ qareas.cpp -o qarea -std=c++0x -pthread
 */
#include <iostream> 
#include <stdlib.h>
#include <thread>
#define CIRCLES 10
#define TRIANGLES 10
using namespace std;

class Circle
{
  public:
    Circle(int r) : radio(r) {}
    ~Circle() {}

    void circleArea(){ area = 3.14159 * (radio*radio); }
    void showArea(){ cout<<"C -"<<radio<<" - "<<area<<endl; }

  private:
    int radio;
    double area;
};

class Triangle
{
  public:
    Triangle(int b, int h) : base(b), high(h) {}
    ~Triangle(){  }

    void triangleArea(){ area = ( base * high) / 2; }
    void showArea(){ cout<<"T -"<<base<<" - "<<high<<" - "<<area; }
  private:
    int base, high;
    double area;
};

void TrianglesArea(){
  int i;
  srand (time(NULL));
  for(i = 0; i < TRIANGLES; i++){
    Triangle* t = new Triangle(rand()%10+1,rand()%15+10);
    t->triangleArea();
    t->showArea();
    delete t;
    sleep(1);
  }
}

void CirclesArea(){
  int i;
  srand (time(NULL));
  for(i = 0; i < CIRCLES; i++){
    Circle* c = new Circle(rand()%10+1);
    c->circleArea();
    c->showArea();
    delete c;
    sleep(1);
  }
}
int main(void){

  cout<<"Id Area"<<endl;
  thread circles(CirclesArea);
  thread triangles(TrianglesArea);

  circles.join();
  triangles.join();

  return 0;
}