C / C++ / MFC

<br />
	SOCKET					Socket;<br />
	int						opt_on = 1;<br />
<br />
<br />
//	Create socket<br />
	Socket = socket(AF_INET, SOCK_STREAM, 0);<br />
<br />
	if(Socket == INVALID_SOCKET)<br />
		return - 1;		<br />
<br />
//	Set socket reuse option<br />
	if( setsockopt( Socket, SOL_SOCKET, SO_REUSEADDR, (char*)&opt_on, sizeof (opt_on) ) == SOCKET_ERROR )<br />
	{	<br />
<br />
		return -1;<br />
<br />
	} //__if( setsockopt(...) == SOCKET_ERROR )__<br />
<br />
//	Set client properties<br />
	cliAddr.sin_family = AF_INET;<br />
	cliAddr.sin_addr.s_addr = inet_addr( "169.254.148.9" );<br />
	cliAddr.sin_port = htons( 4200 );<br />
	<br />
//	Connect to server<br />
	if ( connect( Socket, (struct sockaddr *)&cliAddr, sizeof(cliAddr) ) == SOCKET_ERROR )<br />
	{<br />
<br />
		GetSocketError();<br />
		return -1;<br />
<br />
	} //__if ( connect(...) == SOCKET_ERROR )__<br />
<br />

<br />
switch(Msg){<br />
     case WM_CLOSE:<br />
             ...<br />
          break;<br />
}<br />

// WITHOUT TEMPLATE
class Class1
{
	public:
	Class1(){};
};

class Class2
{
	public:
	Class2(){};
	Class2(Class1 &mat){};
};

void main()
{
	Class1 C1;
	fun(C1);// implicit cast,OK
}

void fun(Class2 a){};

// WITH TEMPLATE
template <class T> class TClass1
{
	public:
	TClass1(){};
};

template <class T> class TClass2
{
	public:
	TClass2(){};
	TClass2(TClass1<T> &mat){};
};

template <class T>  void funT(TClass2<T> a){};

void main()
{
	TClass1<int> TC1;
	funT((TClass2<int> )TC1); // only explicit cast
	funT(TC1); // error C2784: 'void __cdecl funT(class TClass1<T> )' : could not deduce template argument for 'class TClass1<T>' from 'class TClass2<int>' 
}