set_new_handler allows you to specify a function to be called when memory allocation requests cannot be satisfied.
Nothrow
new is of limited utility, because it applies only to memory allocation; subsequent constructor calls may still throw exceptions.
1
#include
<
iostream
>
2
using
namespace
std;
3
4
class
Foo
5
{
6
public
:
7
Foo(){}
8
static
new_handler set_new_handler(new_handler p)
throw
();
9
void
*
operator
new
(size_t size);
10
private
:
11
static
new_handler currentHandler;
12
};
13
14
new_handler Foo::currentHandler
=
0
;
15
16
void
*
Foo::
operator
new
(size_t size)
17
{
18
throw
bad_alloc();
19
}
20
21
new_handler Foo::set_new_handler(new_handler p)
throw
()
22
{
23
//
new_handler oldHandler = currentHandler;
24
//
currentHandler = p;
25
std::set_new_handler(p);
26
return
p;
27
//
return oldHandler;
28
}
29
30
void
outOfMem()
31
{
32
cout
<<
"
out of memory
"
<<
endl;
33
}
34
35
int
main()
36
{
37
set_new_handler(outOfMem);
38
cout
<<
"
Attempting to allocate 1 GB...
"
;
39
char
*
p
=
new
char
[
1024
*
1024
*
1024
*
1024
*
1024
];
40
cout
<<
"
Ok\n
"
;
41
delete[] p;
42
cin.
get
();
43
return
0
;
44
}
转载于:https://www.cnblogs.com/zhtf2014/archive/2011/04/09/2010691.html
