Sponsored Content
Full Discussion: shared pointers
Top Forums UNIX for Advanced & Expert Users shared pointers Post 302299876 by uunniixx on Saturday 21st of March 2009 11:18:54 PM
Old 03-22-2009
shared pointers

I am new to shared pointer conceot in C++ and hence require some clarification:

For example:

class A
{
public:
virtual ~A()
{
}
int x;
};
typedef boost::shared_ptr<A> APtr;


APtr getA()
{
return APtr(new A());
}
A::A()
{
x = 0;
}

When ever I call APtr getA() will every instance of object A will see x as 0?
 

10 More Discussions You Might Find Interesting

1. Programming

Pointers and array

hi all, let say i have a pointer exit, and this exit will store some value. how can i store the value that the pointer points to into an array and then print them out from the array. thanks in advance (2 Replies)
Discussion started by: dianazheng
2 Replies

2. Programming

pointers

is this a valid c declaration int (*ptr(int *b)); plz explain... (4 Replies)
Discussion started by: areef4u
4 Replies

3. Programming

Shared memory in shared library

I need to create a shared library to access an in memory DB. The DB is not huge, but big enough to make it cumbersome to carry around in every single process using the shared library. Luckily, it is pretty static information, so I don't need to worry much about synchronizing the data between... (12 Replies)
Discussion started by: DreamWarrior
12 Replies

4. Programming

pointers

Hi I mash with pointers in C. I solve this problem about 5 hours and I don't know how I should continue. void InsertFirst (tList *L, int val) { tElemPtr new; if((new = malloc(sizeof(tElemPtr))) == NULL) Error(); new->data = val; new->ptr = L->frst; L->frst = new;... (2 Replies)
Discussion started by: Milla
2 Replies

5. Programming

restricted pointers

Hi all. I am trying to use restricted pointers to allow the gcc compiler optimize the code, but I have not been able to make it work so far. I am testing with this code: #include <stdlib.h> #include <stdio.h> #include <time.h> #include <sys/time.h> void vecmult(int n, int * restrict a, int... (0 Replies)
Discussion started by: carl.alv
0 Replies

6. Programming

Shared memory for shared library

I am writing a shared library in Linux (but compatible with other UNIXes) and I want to allow multiple instances to share a piece of memory -- 1 byte is enough. What's the "best" way to do this? I want to optimize for speed and portability. Obviously, I'll have to worry about mutual exclusion. (0 Replies)
Discussion started by: otheus
0 Replies

7. Programming

Need help with the Pointers in C

I have a special character called ô. When it is declared as a character variable its showing it can be printed. But when it is declared as a character pointer variable its showing it cannot be printed. I am just wondering why its happening like this.. c1 = '@'; c2 = 'ô'; char *fp; fp="XXô"; if... (1 Reply)
Discussion started by: sivakumar.rj
1 Replies

8. Programming

Pointer to pointers

Hi guys, I'm trying to understand pointers in C and made a simple example and I've problems with It. Can someone help? #include <stdio.h> #include <stdlib.h> #include <assert.h> int f1(char **str_); int main(int argc, char **argv) { char *str = NULL; f1(&str); ... (3 Replies)
Discussion started by: pharaoh
3 Replies

9. Programming

Shared library with acces to shared memory.

Hello. I am new to this forum and I would like to ask for advice about low level POSIX programming. I have to implement a POSIX compliant C shared library. A file will have some variables and the shared library will have some functions which need those variables. There is one special... (5 Replies)
Discussion started by: iamjag
5 Replies

10. Programming

Pointers and array

Hello, I read from a book exercise for a challenge. How to print out each letter of char array a by two different pointers pa and ppa in the example? I have tried my code for letter "r" by testing without full understanding as only the first one worked. #include<stdio.h> int main() { char... (17 Replies)
Discussion started by: yifangt
17 Replies
libplot(3LIB)							Interface Libraries						     libplot(3LIB)

NAME
libplot, lib300, lib300s, lib4014, lib450, libvt0 - graphics interface libraries SYNOPSIS
cc [ flag... ] file... -lplot [ library... ] #include <plot.h> DESCRIPTION
Functions in this library generate graphics output. INTERFACES
The shared object libplot.so.1 provides the public interfaces defined below. See intro(3) for additional information on shared object interfaces. arc box circle closepl closevt cont erase label line linemod move openpl openvt point space FILES
/usr/lib/libplot.so.1 shared object /usr/lib/64/libplot.so.1 64-bit shared object /usr/lib/lib300.so.1 shared object /usr/lib/64/lib300.so.1 64-bit shared object /usr/lib/lib300s.so.1 shared object /usr/lib/64/lib300s.so.1 64-bit shared object /usr/lib/lib4014.so.1 shared object /usr/lib/64/lib4014.so.1 64-bit shared object /usr/lib/lib450.so.1 shared object /usr/lib/64/lib450.so.1 64-bit shared object /usr/lib/libvt0.so.1 shared object /usr/lib/64/libvt0.so.1 64-bit shared object ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Availability |SUNWcsl (32-bit) | +-----------------------------+-----------------------------+ | |SUNWcslx (64-bit) | +-----------------------------+-----------------------------+ |MT-Level |Unsafe | +-----------------------------+-----------------------------+ SEE ALSO
pvs(1), intro(3), attributes(5) SunOS 5.10 13 Jun 2003 libplot(3LIB)
All times are GMT -4. The time now is 03:10 AM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy