Simple Template

Part of TemplatesCategory

Description

Demonstrates using ! for template instantiation (DMD 0.77+).

Example

template TStat(T)
{ 
    T avg(T a, T b)
    { 
        return (a + b) / 2;
    }
  
    T avg(T a[])
    {
        T b;
        b = 0;  /* If b isn't initialized, then "nan" will be returned. */
        
        for (int i = 0; i < a.length; i++) 
          b += a[i];
        
        return b / a.length;
    }
}


void main()
{  
    int i, j, avg1, avg2;
    int m[];    
    double avg3, avg4;
    double d, e;
    double n[];

    
    i = 6;
    j = 8;
    
    m.length = 4;
    m[0] = 2;
    m[1] = 3;
    m[2] = 4;
    m[3] = 3;
    
    avg1 = TStat!(int).avg(i, j);
    avg2 = TStat!(int).avg(m[]);

    printf("avg1: %d\navg2: %d\n", avg1, avg2);
    
    d = 7.75;
    e = 7.50;
    
    n.length = 3;
    n[0] = 3.13;
    n[1] = 3.15;
    n[2] = 3.19;
    
    avg3 = TStat!(double).avg(d, e);
    avg4 = TStat!(double).avg(n[]);
        
    printf("avg3: %lf\navg4: %lf\n", avg3, avg4);
}

Source

Link	http://jcc_7.tripod.com/d/tutor/template_d077.html
Author	jcc7
Date	2004/01/03