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professional-program-11-FunctionTemplate-FindTemplate.c

? / professional-program-11-FunctionTemplate-FindTemplate.c


  include <iostream>
  using namespace std;
  
  include <SpreadsheetCell.h>
  
  template <typename T>
  int Find(T& value, T* arr, int size)
  {
    for (int i = 0; i < size; i++) {
      if (arr[i] == value) {
        // found it; return the index
        return (i);
      }
    }
    // failed to find it; return -1
    return (-1);
  }
  
  int main(int argc, char** argv)
  {
    int x = 3, intArr[4] = {1, 2, 3, 4};
    double d1 = 5.6, dArr[4] = {1.2, 3.4, 5.7, 7.5};
  
    int res;
    res = Find(x, intArr, 4); // calls Find<int> by deduction
    cout << res << endl;
  
    res = Find<int>(x, intArr, 4); // call Find<int> explicitly
  
    res = Find(d1, dArr, 4); // call Find<double> by deduction
    res = Find<double>(d1, dArr, 4); // calls Find<double> explicitly
    cout << res << endl;
  
    //  res = Find(x, dArr, 4);  // DOES NOT COMPILE! Arguments are different types.
  
    SpreadsheetCell c1(10), c2[2] = {SpreadsheetCell(4), SpreadsheetCell(10)};
  
    res = Find(c1, c2, 2); // calls Find<SpreadsheetCell> by deduction
    res = Find<SpreadsheetCell>(c1, c2, 2); // calls Find<SpreadsheetCell> explicitly
  
    return (0);
  }
  


(C) Æliens 20/2/2008

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