Supplement: C++ Code Examples
Example 10-4. C++ Code Fragments: A Switch to Control Which Driver to Use
// C++ CODE FRAGMENT
// class ApControl
. . .
void ApControl::doDraw () {
. . .
switch (RESOLUTION) {
case LOW:
// use lrdd
case HIGH:
// use hrdd
}
}
void ApControl::doPrint () {
. . .
switch (RESOLUTION) {
case LOW:
// use lrpd
case HIGH:
// use hrpd
}
}
|
Example 10-5. C++ Code Fragments: Using Polymorphism to Solve the Problem
// C++ CODE FRAGMENT
// class ApControl
. . .
void ApControl::doDraw () {
. . .
myDisplayDriver->draw();
}
void ApControl::doPrint () {
. . .
myPrintDriver->print();
}
|
Example 10-6. C++ Code Fragments: Implementation of ResFactory
class ResFactory { public: virtual DisplayDriver *getDispDrvr()=0; virtual PrintDriver ... |
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