See the following code:
If I comment out that line, g++ will complaint "Uncopyable::Uncopyable(const Uncopyable&) is private". I think that mean the default copy ctor of derived class created by g++ called the base class' copy ctor.
If I make available of that line, every thing is ok. It out put
I think this mean the default copy ctor of derived class created by g++ called the base class' default ctor.
Am I right? If yes, why doesn't the default copy ctor derived class, in condition 2, call the base class' copy ctor? Why it behave so inconsistently?
thank you!
Last edited by vistastar; 12-01-2012 at 06:31 AM..
I would like to give execution rights for a script to one user. (that's the easy part...)
When that user is running the script, I would like the effective user ID to be that of the file-owner. Is this possible? (6 Replies)
what's the most efficient and effective search for a file in a dir ?
I see many guys use this
# find - print
or something as such ? and sometimes pipe it to something else ?
Is there a better way of using "grep" in all of this ?
thanks
simon2000 (3 Replies)
im just trying to have some fun and kill some time writing a c++ program that has a person type in a car make and model then gives them a year and a price. or something like that. i always have problems getting it goin but once the ball is rolling im usually pretty good. anyone wanna help me out? ... (1 Reply)
Hi, i have a question about C++. Is it possible to declare a class with a member ot the same class? For example, a linked list or i want to convert this C code to C++ class (Elemento)
typedef struct elemento
{
char name;
char value;
List<struct elemento> ltElementos;
... (7 Replies)
Hi,
I believe the next code is wrong:
class Egg {
Egg e;
int i;
Egg(int ii=0) : i(ii) {}
};
because you would end up with an endless definition (memory allocation) of Egg objects, thus int i.
Ok, so God Eckel proposes for a singleton:
class Egg {
static Egg e;
int... (5 Replies)
Hi all!
I am trying to register a device in an existing device class, but I am
having trouble getting the pointer to an existing class.
I can create a class in a module, get the pointer to it and then use
it to register the device with:
*cl = class_create(THIS_MODULE, className);... (0 Replies)
I have the two class definition as follows.
class A { public: int a; };
class B : virtual public A{ };
The size of class A is shown as 4, and size of class B is shown as 16. Why is this effect ?. (2 Replies)
Hello All,
I am a learner in C++. I was testing my inheritance knowledge with following piece of code.
#include <iostream>
using namespace std;
class base
{
public :
void display()
{
cout << "In base display()" << endl;
}
void display(int k)
{... (2 Replies)
Discussion started by: anand.shah
2 Replies
LEARN ABOUT DEBIAN
randbuffer
FBB::RandBuffer(3bobcat) random number streambuf FBB::RandBuffer(3bobcat)NAME
FBB::RandBuffer - std::streambuf generating random numbers
SYNOPSIS
#include <bobcat/randbuffer>
Linking option: -lbobcat
DESCRIPTION
FBB:RandBuffer objects may be used as a std::streambuf of std::istream objects to allow the extraction of random numbers from the stream.
NAMESPACE
FBB
All constructors, members, operators and manipulators, mentioned in this man-page, are defined in the namespace FBB.
INHERITS FROM
std::streambuf
CONSTRUCTOR
o Randbuffer(int min, int max, size_t seed = 1):
This Randbuffer() constructor initializes the random generator. The seed is used to initialze the random number generator.Random
values between min and max (inclusive) are returned.
VIRTUAL MEMBERS
o int underflow():
This function is called by std::istream objects using Randbuffer. It produces the next available random number, separating the ran-
dom numbers by one blanks space. Random values between min and max (inclusive) are returned (see the description of the construc-
tor).
INHERITED MEMBERS
Since the class uses public derivation from std::streambuf, all members of this class can be used.
EXAMPLE
#include <iostream>
#include <istream>
#include <bobcat/randbuffer>
#include <bobcat/a2x>
using namespace std;
using namespace FBB;
int main(int argc, char **argv)
{
if (argc == 1)
{
cout << "expect: nruns min max seed
";
return 1;
}
Randbuffer rb(A2x(argv[2]), A2x(argv[3]), A2x(argv[4]).to<size_t>());
istream istr(&rb);
for (int idx = A2x(argv[1]); idx--; )
{
int c;
if (!(istr >> c))
{
cout << "extraction failed
";
break;
}
cout << "next: " << c << endl;
}
int count = 0;
while (istr.unget())
count++;
cout << "number of successful unget()-calls: " << count << endl;
istr.clear();
istr >> count;
cout << "and read: " << count << endl;
return 0;
}
FILES
bobcat/randbuffer - defines the class interface
SEE ALSO bobcat(7), irandstream(3bobcat), rand(3), srand(3), std::streambuf
BUGS
None Reported.
DISTRIBUTION FILES
o bobcat_3.01.00-x.dsc: detached signature;
o bobcat_3.01.00-x.tar.gz: source archive;
o bobcat_3.01.00-x_i386.changes: change log;
o libbobcat1_3.01.00-x_*.deb: debian package holding the libraries;
o libbobcat1-dev_3.01.00-x_*.deb: debian package holding the libraries, headers and manual pages;
o http://sourceforge.net/projects/bobcat: public archive location;
BOBCAT
Bobcat is an acronym of `Brokken's Own Base Classes And Templates'.
COPYRIGHT
This is free software, distributed under the terms of the GNU General Public License (GPL).
AUTHOR
Frank B. Brokken (f.b.brokken@rug.nl).
libbobcat1-dev_3.01.00-x.tar.gz 2005-2012 FBB::RandBuffer(3bobcat)