bind2nd question

[Ioannis Vranos]

Shouldn't this compile?


#include <vector>
#include <algorithm>
#include <functional>


int main()
{
using namespace std;

vector<int> vec(1000, 10);


vector<int>::iterator p= find( vec.begin(), vec.end(),
bind2nd(less<int>(), 11) );
}

 

[Kurt Stutsman]

Shouldn't this compile?


#include <vector>
#include <algorithm>
#include <functional>


int main()
{
using namespace std;

vector<int> vec(1000, 10);


vector<int>::iterator p= find( vec.begin(), vec.end(),
bind2nd(less<int>(), 11) );
}

You want to use std::find_if() instead of std::find(). The third paramater to std::find() is
expected to be the value you're looking for, where as std::find_if()'s third paramater is a binary
predicate.

 

[Kurt Stutsman]

You want to use std::find_if() instead of std::find(). The third
paramater to std::find() is expected to be the value you're looking for,
where as std::find_if()'s third paramater is a binary predicate.

Make that a Unary Predicate not a Binary Predicate. Sorry.

 

[Minti]

You are using a predicate, you need to use find_if rather than find.

 

[Jerry Coffin]

Shouldn't this compile?
No.

vector<int>::iterator p= find( vec.begin(), vec.end(),
bind2nd(less<int>(), 11) );

std::find looks for a particular value. To use a predicate, you want to
call std::find_if.