find (STL Samples)

Illustrates how to use the find Standard Template Library (STL) function in Visual C++.

template<class InputIterator, class T> inline 
   InputIterator find(
      InputIterator First,
      InputIterator Last,
      const T& Value
   )

Remarks

The find algorithm locates the first element in the range [First, Last) that matches Value and returns the iterator positioned at the first matching element, or Last if no such element exists.

Example

// find.cpp
// compile with: /EHsc

// disable warning C4786: symbol greater than 255 characters,
// okay to ignore
#pragma warning(disable: 4786)

#include <algorithm>
#include <iostream>

using namespace std;

int main() {
    const int ARRAY_SIZE = 8 ;
    int IntArray[ARRAY_SIZE] = { 1, 2, 3, 4, 4, 5, 6, 7 } ;

    int *location ;   // stores the position of the first
                      // matching element.

    int i ;

    int value = 4 ;

    // print content of IntArray
    cout << "IntArray { " ;
    for(i = 0; i < ARRAY_SIZE; i++)
        cout << IntArray[i] << ", " ;
    cout << " }" << endl ;

    // Find the first element in the range [first, last)
    // that matches value.
    location = find(IntArray, IntArray + ARRAY_SIZE, value) ;

    //print the matching element if any was found
    if (location != IntArray + ARRAY_SIZE)  // matching element found
        cout << "First element that matches " << value
             << " is at location " << location - IntArray << endl;
    else                                    // no matching element was
                                            // found
        cout << "The sequence does not contain any elements"
             << " with value " << value << endl ;
}

Output

IntArray { 1, 2, 3, 4, 4, 5, 6, 7,  }
First element that matches 4 is at location 3

Requirements

Header: <algorithm>

See Also

Concepts

Standard Template Library Samples