memory allocation exception
Hi, I'm writing program that performs some calculations. User needs to enter a number of coeficients, and then program will calculate coeficients according some algorithm.
Basically I have this problem:
Code:
#include<new>
#include<iostream>
using namespace std;
int main()
{
int* arr;
try
{
arr=new int[0x7fffffff];
}
catch(bad_alloc &ba)
{
cout<<ba.what();
}
catch(...)
{
cout<<"Something went wrong!";
}
}
User can enter enormous number of wanted coefficients and allocation may fail.When I compile this code I get warning:
warning C4307: '*' : integral constant overflow.
And this simply doesn't work. I get exception in dbgheap.c
Actually my program is much more complicated (it is dialog based MFC application) but I decided to go step by step.
By the way I found this code in MSDN and it works:
Code:
#include<new>
#include<iostream>
using namespace std;
class MyClass
{
public:
MyClass( )
{
};
~MyClass( )
{
};
int imember[30];
};
int main( )
{
MyClass* fPtr;
try
{
fPtr = new MyClass[0x7fffffff];
delete[ ] fPtr;
}
catch( bad_alloc &ba)
{
cout << ba.what( ) << endl;
};
}
If someone can explain me why?
May be this will work correctly.
May be this will work correctly.
Regards.
Code:
#include<new>
#include<iostream>
using namespace std;
class MyClass
{
public:
MyClass( )
{
};
~MyClass( )
{
};
int imember[30];
};
int main( )
{
MyClass* fPtr;
try
{
fPtr = new MyClass;//BIG MEMORY ALLOCATED HERE
delete fPtr; // BIG TROUBLE HERE, OMITED []
}
catch( bad_alloc &ba)
{
cout << ba.what( ) << endl;
};
}
