class A {
public:
int * mem;
A() : mem(NULL) {
}
~A() {
if (mem!=NULL)
delete mem;
}
}
Of course ,because destructor is called two times, I will get a seg fault.
How can i implement an operator overloading function inside class A to allocate memory before copy and avoid seg fault?
I hope you understand my question...
---------- Post updated at 11:37 AM ---------- Previous update was at 11:19 AM ----------
sorry. next time I will use code tags
Last edited by Scott; 12-18-2010 at 12:32 PM..
Reason: Use code tags, please...
When reading over some perl code in a software document, I came across an assignment statement like this
$PATH = ${PROJECT}/......./....
In this particular form of scalar variable assignment, what does the curly braces operators do ? Also, what is the benefit in doing scalar assignment this... (3 Replies)
Hi,
I have a piece of C++ code that can be compiled using g++, but reports an error when compiled with xlC:
xlC -DHAVE_CONFIG_H -I../SRC -I../include -DNoChange -DSPRNG_MPI -q64 -DLONG64=long -I/usr/lpp/ppe.poe/include -DLONG64=long -c -o libsprng_a-bignum.o bignum.cpp
"bignum.cpp",... (1 Reply)
Hi All,
In C++ one operator can be overloaded, but it can't be overloaded by it's own derieved class
Please let me know operator.
Thanks,
Naga:cool: (1 Reply)
Hi,
I have an requirement to overload the delete operator in C++, but it should also accept the sizeof() the object that is to be deleted. Actually I am trying to built a custom memory allocator and deallocator like a pool, which makes me to overload the delete operator.
Small example of the... (1 Reply)
Hi bros
I have a VPS 512mb (Burst 2GB) with Kloxo installed and hosting few sites on it with not much traffic
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Hi,
In the following code,
class A {
public:
void operator=(const A& rhs) {
if (this == &rhs) cout << "self-assigned";
}
};
class B {
A a; // should not be a pointer member, (i.e) A* a
};
int main() {
B b;
b = b; // Ans: self-assigned
}
I am really... (5 Replies)
Does anyone know how this line in bash works?
local gotbase= force= nicelevel corelimit
local pid base= user= nice= bg= pid_file=
local cgroup=
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I have a little code block (executing on AIX 7.1) that I cannot understand why the NOTFREE=0 does not appear to be assigned even though it goes through that block. This causes a unary operator issue.
#!/bin/bash
PLATFORM="AIX"
NEEDSPC=3000
set -x
if ; then
lsvg | grep -v rootvg | while... (6 Replies)
hi,
I defined my own String class and overloaded the output operator with
friend ostream& operator<<(ostream& os, const myString& str);
//overloads the << operator so it can be used to output values of type myString
which works fine. Until I try to execute the following statement:
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Discussion started by: milhan
6 Replies
LEARN ABOUT MINIX
mem
MEM(4) Linux Programmer's Manual MEM(4)NAME
mem, kmem, port - system memory, kernel memory and system ports
DESCRIPTION
/dev/mem is a character device file that is an image of the main memory of the computer. It may be used, for example, to examine (and even
patch) the system.
Byte addresses in /dev/mem are interpreted as physical memory addresses. References to nonexistent locations cause errors to be returned.
Examining and patching is likely to lead to unexpected results when read-only or write-only bits are present.
Since Linux 2.6.26, and depending on the architecture, the CONFIG_STRICT_DEVMEM kernel configuration option limits the areas which can be
accessed through this file. For example: on x86, RAM access is not allowed but accessing memory-mapped PCI regions is.
It is typically created by:
mknod -m 660 /dev/mem c 1 1
chown root:kmem /dev/mem
The file /dev/kmem is the same as /dev/mem, except that the kernel virtual memory rather than physical memory is accessed. Since Linux
2.6.26, this file is available only if the CONFIG_DEVKMEM kernel configuration option is enabled.
It is typically created by:
mknod -m 640 /dev/kmem c 1 2
chown root:kmem /dev/kmem
/dev/port is similar to /dev/mem, but the I/O ports are accessed.
It is typically created by:
mknod -m 660 /dev/port c 1 4
chown root:kmem /dev/port
FILES
/dev/mem
/dev/kmem
/dev/port
SEE ALSO chown(1), mknod(1), ioperm(2)COLOPHON
This page is part of release 4.15 of the Linux man-pages project. A description of the project, information about reporting bugs, and the
latest version of this page, can be found at https://www.kernel.org/doc/man-pages/.
Linux 2015-01-02 MEM(4)
12-18-2010
