Download Multiple Type Arguments-Object Oriented Programming-Lecture Slides and more Slides Object Oriented Programming in PDF only on Docsity!
Object
Object
Oriented Programming
Oriented Programming
(OOP)
(OOP)
Lecture No. 33
Lecture No. 33
docsity.com
Multiple Type Arguments
Multiple Type Arguments
template< typename T, typename U >
template< typename T, typename U >
T my_cast( U u ) { T my_cast( U u ) {
return (T)u;
return (T)u;
int main() { int main() {
double d = 10.5674;
double d = 10.5674;
int j = my_cast( d ); int j = my_cast( d ); //Error//Error
int i = my_cast< int >( d );
int i = my_cast< int >( d );
return 0; return 0;
docsity.com
User
User
Defined Types
Defined Types
class String { class String {
char* pStr;
char* pStr;
friend bool operator ==(
friend bool operator ==(
const String&, const String& ); const String&, const String& );
docsity.com
User
User
Defined Types
Defined Types
template< typename T >
template< typename T >
bool isEqual( T x, T y ) { bool isEqual( T x, T y ) {
return ( x == y ); return ( x == y );
int main() {
int main() {
String s1 = String s1 = ““xyzxyz””, s2 =, s2 = ““xyzxyz””;;
isEqual( s1, s2 ); isEqual( s1, s2 ); // OK// OK
return 0; return 0;
docsity.com
Example
Example
Overloading vs Templates
Overloading vs Templates
String operator +( const char * str1, String operator +( const char * str1,
const String& y ) { const String& y ) {
String tmp; String tmp;
tmp.pStr = new char[ strlen(str1) +
tmp.pStr = new char[ strlen(str1) +
strlen(y.pStr) + 1 ]; strlen(y.pStr) + 1 ];
strcpy( tmp.pStr, str1 ); strcpy( tmp.pStr, str1 );
strcat( tmp.pStr, y.pStr );
strcat( tmp.pStr, y.pStr );
return tmp; return tmp;
} } docsity.com
Template Arguments as Policy
Template Arguments as Policy
►
►
Policy specializes a template for an
Policy specializes a template for an
operation (behavior)
operation (behavior)
docsity.com
Second Solution
Second Solution
int compare( char* str1, char* str2,
int compare( char* str1, char* str2,
bool caseSen )
bool caseSen )
for (int i = 0; i < strlen( str1 )
for (int i = 0; i < strlen( str1 )
&& i < strlen( str2 ); i++)
&& i < strlen( str2 ); i++)
if (if ( …… ))
return str1[i]
return str1[i]
str2[i];
str2[i];
return strlen(str1)
return strlen(str1)
strlen(str2);
strlen(str2);
docsity.com
Third Solution
Third Solution
class CaseSenCmp { class CaseSenCmp {
public: public:
static int isEqual( char x, char y )
static int isEqual( char x, char y )
return x == y;
return x == y;
docsity.com
Sample Output
Sample Output
Case Sensitive: 32 Case Sensitive: 32 // Not Equal// Not Equal
Non Non--case Sensitive: 0case Sensitive: 0 // Equal// Equal
docsity.com
Third Solution
Third Solution
int main() {
int main() {
int i, j; int i, j;
char *x = "hello", *y = "HELLO";
char *x = "hello", *y = "HELLO";
i = compare(x, y); i = compare(x, y);
j = compare< NonCaseSenCmp >(x, y);
j = compare< NonCaseSenCmp >(x, y);
cout << "Case Sensitive: " << i; cout << "Case Sensitive: " << i;
cout << "
cout << " \
\
nNon
nNon
Case Sensitive:
Case Sensitive: “
<< j << endl; << j << endl;
return 0;
return 0;
docsity.com
