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class CallableClass
 {
 private:
 // Number of iterations
 int m_iterations;
 
 public:
 
 // Default constructor
 CallableClass()
 {
 m_iterations=10;
 }
 
 // Constructor with number of iterations
 CallableClass(int iterations)
 {
 m_iterations=iterations;
 }
 
 
 // Copy constructor
 CallableClass(const CallableClass& source)
 {
 m_iterations=source.m_iterations;
 }
 
 // Destructor
 ~CallableClass()
 {
 }
 
 // Assignment operator
 CallableClass& operator = (const CallableClass& source)
 {
 m_iterations=source.m_iterations;
 return *this;
 }
 
 // Static function called by thread
 static void StaticFunction() 
 {
 for (int i=0; i < 10; i++) // Hard-coded upper limit
 {
 cout<<i<<"Do something in parallel (Static function)."<<endl;
 boost::this_thread::yield(); // 'yield' discussed in section 18.6
 }
 }
 
 // Operator() called by the thread
 void operator () ()
 {
 for (int i=0; i<m_iterations; i++)
 {
 cout<<i<<" - Do something in parallel (operator() )."<<endl;
 boost::this_thread::yield();
 }
 }
 
 };
 
 

prog.cpp: In static member function ‘static void CallableClass::StaticFunction()’:
prog.cpp:45:2: error: ‘cout’ was not declared in this scope
  cout<<i<<"Do something in parallel (Static function)."<<endl;
  ^~~~
prog.cpp:45:58: error: ‘endl’ was not declared in this scope
  cout<<i<<"Do something in parallel (Static function)."<<endl;
                                                          ^~~~
prog.cpp:46:2: error: ‘boost’ has not been declared
  boost::this_thread::yield(); // 'yield' discussed in section 18.6
  ^~~~~
prog.cpp: In member function ‘void CallableClass::operator()()’:
prog.cpp:55:2: error: ‘cout’ was not declared in this scope
  cout<<i<<" - Do something in parallel (operator() )."<<endl;
  ^~~~
prog.cpp:55:57: error: ‘endl’ was not declared in this scope
  cout<<i<<" - Do something in parallel (operator() )."<<endl;
                                                         ^~~~
prog.cpp:56:2: error: ‘boost’ has not been declared
  boost::this_thread::yield();
  ^~~~~

Standard output is empty