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john smith
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 Posted: Fri Jan 28, 2005 2:50 am Post subject: overriding global new |
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I am trying to override global new.
Yes, I know this is not a good idea, but I want to do it anyway. Notice
that I am not trying to override new in a class.
Any suggestions? I thought the below would work but it just goes into a
recursive call (infinite loop)
Is this not possible? ummm
Many thanks to any suggestions.
#include <iostream>
class car {
public:
car()
{
std::cout << "car " << std::endl;
}
int type;
};
int main()
{
car my_car;
car* p_my_car = new car();
return 0;
}
void* operator new( size_t my_size)
{
std::cout << "now grabbing some memory" << std::endl;
return ::operator new( my_size );
}
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Ian McCulloch
Guest
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| Posted: Fri Jan 28, 2005 2:58 am Post subject: Re: overriding global new |
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john smith wrote:
| Quote: | I am trying to override global new.
Yes, I know this is not a good idea, but I want to do it anyway. Notice
that I am not trying to override new in a class.
Any suggestions? I thought the below would work but it just goes into a
recursive call (infinite loop)
Is this not possible? ummm
|
[...]
| Quote: | void* operator new( size_t my_size)
{
std::cout << "now grabbing some memory" << std::endl;
return ::operator new( my_size );
}
|
Your global operator new is calling itself. I guess you meant to call the
'default' operator new instead? I don't think you can do that, but instead
you can use malloc. Also, you need to be *very* careful what you call
inside operator new. Any kind of C++-style IO or string handling is likely
to do some internal memory management, which may in turn .... call operator
new! Indeed, that is quite likely with your std::cout << "now grabbing
some memory" << std::endl; line. You can do C-style IO though. Try:
#include
void* operator new(size_t size)
{
std::printf("now grabbing some memoryn");
return malloc(size);
}
HTH,
Ian McCulloch
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