Number at runtime

[ikl]

class A
{
....
};

For class A, several instances of it could be created, but their number is
unknown until runtime. How to do this?

Thanks!

[John Harrison]

"ikl" <ik***@dsp.com> wrote in message
news:6B********************@bgtnsc05-news.ops.worldnet.att.net...

class A
{
...
};

For class A, several instances of it could be created, but their number is
unknown until runtime. How to do this?

Use a vector.

#include <vector>

std::vector<A> vec(n); // creates n A objects

john

[John Harrison]

"ikl" <ik***@dsp.com> wrote in message
news:6B********************@bgtnsc05-news.ops.worldnet.att.net...

class A
{
...
};

For class A, several instances of it could be created, but their number is
unknown until runtime. How to do this?

Use a vector.

#include <vector>

std::vector<A> vec(n); // creates n A objects

john

[ikl]

John Harrison <jo*************@hotmail.com> wrote in message
news:c5*************@ID-196037.news.uni-berlin.de...

"ikl" <ik***@dsp.com> wrote in message
news:6B********************@bgtnsc05-news.ops.worldnet.att.net...

class A
{
...
};

For class A, several instances of it could be created, but their number is unknown until runtime. How to do this?

Use a vector.

#include <vector>

std::vector<A> vec(n); // creates n A objects

john

When I try it gives error: "error C2061: syntax error : identifier 'n'"
Does anyone know why? Thanks!

#include <vector>

using std::vector;

class B
{
};

int n = 1;

class A
{
vector<B> vec(n);

};

[ikl]

John Harrison <jo*************@hotmail.com> wrote in message
news:c5*************@ID-196037.news.uni-berlin.de...

"ikl" <ik***@dsp.com> wrote in message
news:6B********************@bgtnsc05-news.ops.worldnet.att.net...

class A
{
...
};

For class A, several instances of it could be created, but their number is unknown until runtime. How to do this?

Use a vector.

#include <vector>

std::vector<A> vec(n); // creates n A objects

john

When I try it gives error: "error C2061: syntax error : identifier 'n'"
Does anyone know why? Thanks!

#include <vector>

using std::vector;

class B
{
};

int n = 1;

class A
{
vector<B> vec(n);

};

[Jon Willeke]

ikl wrote:

When I try it gives error: "error C2061: syntax error : identifier 'n'"
Does anyone know why? Thanks!

#include <vector>

using std::vector;

class B
{
};

int n = 1;

class A
{
vector<B> vec(n);

};

Member initialization is the constructor's responsibility:

class A
{
vector<B> vec;
public:
A() : vec( n ) {}
}

[Jon Willeke]

ikl wrote:

When I try it gives error: "error C2061: syntax error : identifier 'n'"
Does anyone know why? Thanks!

#include <vector>

using std::vector;

class B
{
};

int n = 1;

class A
{
vector<B> vec(n);

};

Member initialization is the constructor's responsibility:

class A
{
vector<B> vec;
public:
A() : vec( n ) {}
}

[Christopher Benson-Manica]

ikl <ik***@dsp.com> spoke thus:

John Harrison <jo*************@hotmail.com> wrote in message
news:c5*************@ID-196037.news.uni-berlin.de... When I try it gives error: "error C2061: syntax error : identifier 'n'"
Does anyone know why? Thanks! vector<B> vec(n);

Yep - John wrote "n" to denote that you should replace it with a
number of your choice.

--
Christopher Benson-Manica | I *should* know what I'm talking about - if I
ataru(at)cyberspace.org | don't, I need to know. Flames welcome.

[Christopher Benson-Manica]

ikl <ik***@dsp.com> spoke thus:

John Harrison <jo*************@hotmail.com> wrote in message
news:c5*************@ID-196037.news.uni-berlin.de... When I try it gives error: "error C2061: syntax error : identifier 'n'"
Does anyone know why? Thanks! vector<B> vec(n);

Yep - John wrote "n" to denote that you should replace it with a
number of your choice.

--
Christopher Benson-Manica | I *should* know what I'm talking about - if I
ataru(at)cyberspace.org | don't, I need to know. Flames welcome.

[ikl]

Jon Willeke <j.***********@verizon.dot.net> wrote in message
news:9m******************@nwrdny03.gnilink.net...

ikl wrote:

When I try it gives error: "error C2061: syntax error : identifier 'n'"
Does anyone know why? Thanks!

#include <vector>

using std::vector;

class B
{
};

int n = 1;

class A
{
vector<B> vec(n);

};

Member initialization is the constructor's responsibility:

class A
{
vector<B> vec;
public:
A() : vec( n ) {}
}

Why have to use constructor to initialize "vec"? Why not just like,

class B
{
int Number[10];
};

and don't need to initialize with "10"?

Thanks!

[ikl]

Jon Willeke <j.***********@verizon.dot.net> wrote in message
news:9m******************@nwrdny03.gnilink.net...

ikl wrote:

When I try it gives error: "error C2061: syntax error : identifier 'n'"
Does anyone know why? Thanks!

#include <vector>

using std::vector;

class B
{
};

int n = 1;

class A
{
vector<B> vec(n);

};

Member initialization is the constructor's responsibility:

class A
{
vector<B> vec;
public:
A() : vec( n ) {}
}

Why have to use constructor to initialize "vec"? Why not just like,

class B
{
int Number[10];
};

and don't need to initialize with "10"?

Thanks!