#include <iostream>

using namespace std;

class Foo
{
public:
  Foo ( void );
  explicit Foo ( int var );  //遵循1
  int getVar ( void );
  ~Foo ( void );
private:
  int a;
};
Foo::Foo ( void )
{
  a = 0;
}
Foo::Foo ( int var )
{
  a = var;
}
int Foo::getVar ( void )
{
  return a;
}
Foo::~Foo ( void )
{
}

void f ( int );

int main ( void )
{
  Foo thef ( 1 );

  int i = 1;

  f ( i );

  return ( 0 );
}

void f ( int i )
{
  int j;

  Foo thef ( 1 );

  //...

  j = thef.getVar ( );
}