loop -> for_each

[ibe]

Hi,
i can't get the clue:
I hav a loop in my code like this:

---snip---

class Foo {
accept(Visitor& v) {
v.visit(*this);
}
};

class Visitor {
visit (Foo& f) {
...
}
}

....in main...

Visitor v(arugments, ...);
for (std::deque<Foo*>::iterator iter = list_.begin();
iter != m_list.end();
++iter) {
(*iter)->accept(v);
}

---snip---

Now i would like to do this with for_each. I think i need std::mem_fun (or
bind1st ?!?).
Can anyone help me?

htx
ibe

 

[Thomas Jakob]

Hi,
i can't get the clue:
I hav a loop in my code like this:

---snip---

class Foo {
accept(Visitor& v) {
v.visit(*this);
}
};

class Visitor {
visit (Foo& f) {
...
}
}

I changed this in my example to:

struct Foo;

struct Visitor {
void visit (Foo& f) {
}
};

struct Foo {
void accept(Visitor* v) {
v->visit(*this);
}
};

Using a reference in Foo::accept will cause a "reference to reference",
if u want to use a reference boost::ref might be a solution.

....in main...

Visitor v(arugments, ...);
for (std::deque<Foo*>::iterator iter = list_.begin();
iter != m_list.end();
++iter) {
(*iter)->accept(v);
}

---snip---

Now i would like to do this with for_each. I think i need std::mem_fun (or
bind1st ?!?).
Can anyone help me?

htx
ibe

Try

std::for_each(list.begin(), list.end(),
std::bind2nd(std::mem_fun(&Foo::accept), &v));

But i would always prefer boost::bind.