C + + Use STL find_if function instance in member function _c language

This article illustrates the method for C + + to use STL find_if function in member functions. Share to everyone for your reference. The specific methods are analyzed as follows:

In general, the STL find_if function is very powerful, you can use the input function instead of the operator to perform the lookup function (this online has a lot of information, I will not say more here).

Looking for an odd number in an array, for example, can be done with the following code (refer here: http://www.cplusplus.com/reference/algorithm/find_if/):

#include <iostream>
#include <algorithm>
#include <vector>
using namespace std;

BOOL IsOdd (int i) {return
 ((i%2) ==1);
}

int main () {
 vector<int> myvector;
 Vector<int>::iterator it;

 Myvector.push_back (ten);
 Myvector.push_back (a);
 Myvector.push_back ();
 Myvector.push_back ();

 it = find_if (Myvector.begin (), Myvector.end (), isodd);
 cout << "The odd value is" << *it << Endl;

 return 0;
}

Run Result:

The odd value is 25

If you add the above code to the class, write the member function of the class, what is the effect?

such as the following code:

#include <iostream>
#include <algorithm>
#include <vector>
using namespace std;

Class CTest
{public
:
 bool isodd (int i) {return
  ((i%2) ==1);
 }

 int Test () {
  vector<int> myvector;
  Vector<int>::iterator it;
  Myvector.push_back (ten);
  Myvector.push_back (a);
  Myvector.push_back ();
  Myvector.push_back ();
  it = find_if (Myvector.begin (), Myvector.end (), isodd);
  cout << "The odd value is" << *it << Endl;
  return 0;
 }
;
int main ()
{
 ctest t1;
 T1.test ();
 return 0;
}

An error similar to the following appears:

Error C3867: ' ctest::isodd ': function call missing argument list; Use ' &ctest::isodd ' to create a pointer

Today I encountered this problem, the solution is posted here for reference only:

it = find_if (Myvector.begin (), Myvector.end (), isodd);

To

it = find_if (Myvector.begin (), Myvector.end (), std::bind1st (Std::mem_fun (&ctest::isodd), this);

With the bind1st function and the Mem_fun function plus this pointer.

Full instance code click here to download the site.

I hope this article will help you with the C + + program design.