// ========================================== 
// * Samples 
// * Member and non-member operators
// * Usage Sample Code 
// ------------------------------------------ 
// * Language : C++ 
// * Compiler: GNU g++ 3.4.4
// * Content  : Program files, Log files 
// * Version  : MOP-1.1 
// ------------------------------------------ 
// * Attachments
//   - mem-nomem-operators-1-1.cpp 
//   - mem-nomem-operators-1-1.log 
// ========================================== 



#include <iostream> 
using namespace std;

// ------
struct Blah1 {};
struct Blah2 {};

// ------
class Foo 
{ 
friend Foo operator+ (const Foo& arg1, const Foo& arg2); 
friend Foo operator+ (int arg1,        const Foo& arg2); 
friend Foo operator+ (const Foo& arg1, int arg2); 

private: 
  int     m_value; 

public : 
  Foo () {}
  Foo (const Blah1&)
  {
    cout << "Constructor: " << __PRETTY_FUNCTION__ << endl; 
  }

  explicit Foo (const Blah2&)
  {
    cout << "Constructor: " << __PRETTY_FUNCTION__ << endl; 
  }


  Foo& operator- (const Foo& arg) 
  { 
    m_value -= arg.m_value; 
    cout << "Member:      " << __PRETTY_FUNCTION__ << endl; 
    return (*this); 
  } 

  Foo& operator- (int arg) 
  { 
    m_value -= arg; 
    cout << "Member:      " << __PRETTY_FUNCTION__ << endl; 
    return (*this); 
  } 

}; 


// ------
Foo operator+ (const Foo& arg1, const Foo& arg2) 
{ 
  Foo foo; 
  foo.m_value = arg1.m_value + arg2.m_value; 
  cout << "Non-Member:  " << __PRETTY_FUNCTION__ << endl; 
  return foo; 
} 

// ------
Foo operator+ (int arg1, const Foo& arg2) 
{ 
  Foo foo; 
  foo.m_value = arg1 + arg2.m_value; 
  cout << "Non-Member:  " << __PRETTY_FUNCTION__ << endl; 
  return foo; 
} 

// ------
Foo operator+ (const Foo& arg1, int arg2) 
{ 
  Foo foo; 
  foo.m_value = arg1.m_value + arg2; 
  cout << "Non-Member:  " << __PRETTY_FUNCTION__ << endl; 
  return foo; 
} 


// ------
struct Bar 
{ 
  operator Foo () { cout << "operator:    " <<  __PRETTY_FUNCTION__ << endl;} 
}; 


// ------
int main () 
{ 
Foo f0, f1, f2; 
  f0 = f1 + f2; 
  f0 = f1 - f2; 

  cout << endl;
int i1 = 127;
  f0 = f1 + i1; 
  f0 = i1 + f1; 
  f0 = f1 - i1; 
  // f0 = i1 - f1;	// no match for 'operator-' in 'i1 - f1'

  cout << endl;
Blah1 b1;
  f0 = f1 + b1; 
  f0 = b1 + f1; 
  f0 = f1 - b1; 
  // f0 = b1 - f1;	// no match for 'operator-' in 'b1 - f1'

  cout << endl;
Blah2 b2;
  // f0 = f1 + b2;	// no match for 'operator+' in 'f1 + b2' 
  // f0 = b2 + f1;	// no match for 'operator+' in 'b2 + f1'
  // f0 = f1 - b2;	// no match for 'operator+' in 'b2 + f1' 
  // f0 = b1 - f1;	// no match for 'operator-' in 'b1 - f1'

  cout << endl;
Foo foo; 
Bar bar; 
  f0 = foo + bar; 
  f0 = foo - bar; 
  f0 = bar + foo; 
  // f0 = bar - foo;	// no match for 'operator-' in 'bar - foo'

  return 0; 
}