Обработка исключительных ситуаций

Пример

#include <iostream>		void f2(){
#include <fstream>		try{ f3(); }
using namespace std;		catch(except& e){
class except{		cout<<"Exception caught in f2 and
		rethrow"<< endl;
public:
		throw e;} }
except(){
		void f1(){
cout<<"Exception
		try{f2(); }
constructed"<<endl; }
except(const except&){		catch(except& e)
cout<<"Exception copied"<<endl;	}	{
void check(){		cout<<"Exception caught in f1"<<endl;
cout<<"Exception		e.check();} }
checked"<<endl;}		int _tmain()
};		{
void f3(){ throw except();}		f1();
		cin.get();
		return 0;
		}

Обработка исключений ,

сгенерированных оператором

new

#include <new> #include <iostream> using namespace std; int _tmain()

{

int *p,i; try{

p=new int[32];

}

catch(bad_alloc){ cout<<"Allocation falure.\n"; return 1;

}

for(i=0;i<32;i++) { p[i]=i; cout<<p[i]<<" ";} delete [] p;

return 0;

}

Перегрузка new и delete

void* operator new(size_t size)

{

return pointer_to_mem;

}

void* operator new[](size_t size)

{

return pointer_to_mem;

}

void operator delete(void *p){

}

void operator delete[](void *p){

}

Пример

class three_d{ int x,y,z; public:

three_d(){x=y=z=0;} three_d(int i, int j, int k){ x=i;y=j;z=k;}

void* operator new(size_t size); void* operator new[](size_t size); void operator delete(void *p); void operator delete[](void *p);

void show(){cout<<x<<y<<z<<endl;}

};

void* three_d::operator new(size_t size){

void *p; p=malloc(size); if(!p){ bad_alloc ba; throw ba;

}

}

void three_d::operator delete(void *p){ free(p);

}

Пример

void* three_d::operator new[](size_t size){

void *p; p=malloc(size); if(!p){ bad_alloc ba; throw ba;

}

}

void three_d::operator delete[](void *p){

free(p);

}

int main()

{

three_d *p1; int i;

try{

p1=new three_d[32];

}

catch(bad_alloc){ cout<<"Allocation falure.\n"; return 1;

}

for(i=0;i<32;i++) p1[i].show(); delete [] p1;

return 0;

}

Стандартные функции

void exit(int status);

status=0//EXIT_SUCCESS status=1//EXIT_FALURE

void abort();