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2010-05-25T14:21:06Z

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2010-05-25T10:27:25Z

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==A Function with Two Generic Types==

<source lang="cpp">
#include <iostream>
using namespace std;

template <class type1, class type2>
void myfunc(type1 x, type2 y)
{
cout << x << " " << y << "\n";
}

int main()
{
myfunc(10, "I like C++");

myfunc(98.6, 19L);

return 0;
}

</source>

==Applying Generic Functions: A Generic Bubble Sort==

<source lang="cpp">
#include <iostream>
using namespace std;

template <class X> void bubble(
X *items, // pointer to array to be sorted
int count) // number of items in array
{
register int a, b;
X t;

for(a=1; a<count; a++)
for(b=count-1; b>=a; b--)
if(items[b-1] > items[b]) {
// exchange elements
t = items[b-1];
items[b-1] = items[b];
items[b] = t;
}
}

int main()
{
int iarray[7] = {7, 5, 4, 3, 9, 8, 6};
double darray[5] = {4.3, 2.5, -0.9, 100.2, 3.0};

for(int i=0; i<7; i++)
cout << iarray[i] << endl;

for(int i=0; i<5; i++)
cout << darray[i] << endl;

bubble(iarray, 7);
bubble(darray, 5);

for(int i=0; i<7; i++)
cout << iarray[i] << endl;

for(int i=0; i<5; i++)
cout << darray[i] << endl;

return 0;
}

</source>

==Cast generic parameters==

<source lang="cpp">
#include <iostream>
using namespace std;
template <class T1, class T2>
bool coerce(T1& x, T2 y)
{
if (sizeof(x) < sizeof(y))
return false;
x = static_cast<T1>(y);
return true;
}
int main()
{
int i, j;
float x;
double y;
char ch1;

i = "a"; ch1 = "b";
cout << "\ncoerce int, ch = ";
cout << coerce(i, ch1);
cout << " i = " << i << " ch1 = " << ch1;
i = "a"; ch1 = "b";
cout << "\ncoerce ch, int = ";
cout << coerce(ch1, i);
cout << " i = " << i << " ch1 = " << ch1;
x = 1.1; y = 2.2;
cout << "\ncoerce fl, dbl = ";
cout << coerce(x, y);
cout << " x = " << x << " y = " << y;
x = 1.1; y = 2.2;
cout << "\ncoerce dbl, fl = ";
cout << coerce(y, x);
cout << " x = " << x << " y = " << y;
cout << endl; cin>> i;
}

</source>

==Generic Function Restrictions==

<source lang="cpp">
#include <iostream>
#include <cmath>
using namespace std;

void myfunc(int i)
{
cout << "value is: " << i << "\n";
}

void myfunc(double d)
{
double intpart;
double fracpart;

fracpart = modf(d, &intpart);
cout << "Fractional part: " << fracpart;
cout << "\n";
cout << "Integer part: " << intpart;
}

int main()
{
myfunc(1);
myfunc(12.2);

return 0;
}

</source>

==Generic function template==

<source lang="cpp">
#include <iostream>
using namespace std;

template <class X> void swapargs(X &a, X &b){
X temp;

temp = a;
a = b;
b = temp;
}

int main(){
int i=10, j=20;
double x=10.1, y=23.3;
char a="x", b="z";

cout << "Original i, j: " << i << " " << j << "\n";
cout << "Original x, y: " << x << " " << y << "\n";
cout << "Original a, b: " << a << " " << b << "\n";

swapargs(i, j); // swap integers
swapargs(x, y); // swap floats
swapargs(a, b); // swap chars

cout << "Swapped i, j: " << i << " " << j << "\n";
cout << "Swapped x, y: " << x << " " << y << "\n";
cout << "Swapped a, b: " << a << " " << b << "\n";

return 0;
}

</source>

==template for value output==

<source lang="cpp">
#include <iostream>
using namespace std;
template <class T1, class T2> void sample(T1 x, T2 y);
int main(void)
{
sample(10, "hi");
sample(0.23, 10L);
sample("Jamsa"s", "C/C++");
}
template <class T1, class T2> void sample(T1 x, T2 y)
{
cout << x << " " << y << endl;
}

</source>

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