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|
#include <iostream>
class abstractSingleton
{
protected:
static abstractSingleton* instance;
abstractSingleton(){}
virtual ~abstractSingleton(){}
};
abstractSingleton* abstractSingleton::instance = NULL;
class concretSingleton1 : public abstractSingleton
{
private:
concretSingleton1() {}
~concretSingleton1() {}
public:
static abstractSingleton* GetInstance()
{
if ( abstractSingleton::instance == NULL ) {
abstractSingleton::instance = new concretSingleton1();
}
return abstractSingleton::instance;
}
void Message()
{
std::cout << "Ce message est affiche par concretSingleton1" << std::endl;
}
};
class concretSingleton2 : public abstractSingleton
{
private:
concretSingleton2() {}
~concretSingleton2() {}
public:
static abstractSingleton* GetInstance()
{
if ( abstractSingleton::instance == NULL )
{
abstractSingleton::instance = new concretSingleton2();
}
return abstractSingleton::instance;
}
void Message()
{
std::cout << "Ce message est affiche par concretSingleton2" << std::endl;
}
};
int main()
{
concretSingleton1* inst1 = NULL;
concretSingleton2* inst2 = NULL;
inst1 = dynamic_cast<concretSingleton1*> (concretSingleton1::GetInstance());
inst2 = dynamic_cast<concretSingleton2*> (concretSingleton2::GetInstance());
std::cout << " inst1 = " << inst1 << std::endl;
std::cout << " inst2 = " << inst2 << std::endl;
if (inst1 != NULL) inst1->Message();
if (inst2 != NULL) inst2->Message();
std::cout << std::endl << "Bizarre qu'un pointeur NULL plante pas..." << std::endl;
inst2->Message();
inst1->Message();
std::cin.ignore();
return 0;
} |
