2 BytesC++ course_2014_c10_ separate compilation and namespaces
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The document discusses separate compilation in C++. It explains that a program can be separated into header files that define interfaces, implementation files that define function bodies, and a main file. Header files have a .h extension and implementation files have a .cpp extension. Files include other files using the #include directive. The document also covers using #ifndef to prevent multiple inclusions of a header, and using namespaces to avoid name collisions. It provides examples of header files, implementation files, and an application file that uses a class. Finally, it lists homework problems involving defining classes for points, circles, and cylinders.
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2 BytesC++ course_2014_c10_ separate compilation and namespaces
- 1. Kinan keshkeh IT Engineering-Damascus University 3rd year Summer course- 2014 2 bytes team
- 3. Separate Compilation •In this way you can build up a library of classes so that many programs can use the same class ! • you can separate a program in C++ into files : 1- Header Files : class interface- structure interface – functions declarations … 2- Implementation Files : for functions definitions . 3- Main File .
- 4. Separate Compilation •Usually the Header file and the Implementation file are given the same name and the difference just in “ .h” “.cpp” . •“ .h “ : for Header files. •“ .cpp “ : for implementation files /main file .
- 5. Separate Compilation •To include file into another file : include ”ur file name . h “
- 6. Separate Compilation Headerfile1.h impfile1.cpp Main.cpp Headerfile2.h impfile2.cpp
- 7. Separate Compilation Headerfile1.h impfile1.cpp Main.cpp Headerfile2.h impfile2.cpp Include” Headerfile1.h “ Include” Headerfile2.h “
- 8. Separate Compilation Headerfile1.h impfile1.cpp Main.cpp Headerfile2.h impfile2.cpp
- 9. Separate Compilation Headerfile1.h impfile1.cpp Main.cpp Headerfile2.h impfile2.cpp Include” Headerfile1.h “ Include” Headerfile2.h “
- 10. Separate Compilation Headerfile1.h impfile1.cpp Main.cpp Headerfile2.h impfile2.cpp
- 11. Separate Compilation Headerfile1.h impfile1.cpp Main.cpp Headerfile2.h impfile2.cpp
- 12. Separate Compilation Headerfile1.h impfile1.cpp Main.cpp Headerfile2.h impfile2.cpp Include” Headerfile1.h “ Include” Headerfile2.h “ Include” Headerfile1.h “
- 13. Separate Compilation Headerfile1.h impfile1.cpp Main.cpp Headerfile2.h impfile2.cpp Include” Headerfile2.h “
- 14. Separate Compilation •Interface(header) File for the DigitalTime Class :
- 15. Separate Compilation •Implementation File :
- 16. Separate Compilation •Implementation File :
- 17. Separate Compilation •Implementation File :
- 18. Separate Compilation •Application File Using DigitalTime Class :
- 20. USING #ifndef
- 21. USING #ifndef •It’s used to not allowing using (include” hfile.h“) more than one time ! #ifndef hfile_H #define hfile_H <a class definition> #endif
- 22. USING #ifndef the class will be defined only one time. The first time: #include " hfile.h " is processed, the flag hfile_H is defined and the class is defined. Now, suppose the compiler again encounters #include " hfile.h " When the include directive is processed this second time, the directive #ifndef hfile_H says to skip everything up to #endif and so the class is not defined again.
- 23. Namespaces !
- 24. Namespaces •Names are given for variables , classes , functions … •You can give a (name) in a Namespace and give the same (name) in another Namespace but with different usage . •Each (name) in a program is related to a Namespace , and by default to “Global Namespace “ .
- 25. Namespaces •To make a Namespace : namespace Namespace_Name { Some_Code ………. } •To call a Namespace : using namespace Namespace_Name; •In a scope u may have more than Namespace: using namespace NS1; using namespace NS2;
- 26. Namespaces
- 29. Namespaces • Implementation File:
- 30. Namespaces • Implementation File:
- 31. Namespaces • Implementation File:
- 32. Namespaces •Application Program file :
- 33. Namespaces •Application Program file :
- 34. Namespaces •Nested Namespace : namespace S1 { n11... namespace S2 { n21.... } //S2 }//S1 •To call n21 : •From outside s1 : s1::s2::n21 •From inside s1 : s2::n21
- 35. Homework ( classes +separate compilation ) سؤال عممي : • عرف الصف point لتعريف نقطة في مجال الاحداثيات الديكارتية (x,y) وعرف عميه الط ا رئق التالية : 1 - الباني الافت ا رضي (x=0, y=0) . 2 - الباني بالقيم . 3 - الباني الناسخ 4 - طباعة بيانات الاحداثيات . • عرف باستخدام الصف السابق الصف circle لتعريف دائرة معرفة بالمركز center ونصف القطر r وعرف عميه الط ا رئق التالية : 1 - الباني الافت ا رضي (r=1) . 2 - الباني (x,y,r) . 3 - الباني)نصف القطر , نقطة المركز ( . 4 - الباني الناسخ. 5 - المساحة . 4 - طباعة بيانات الدائرة .
- 36. Homework • فصلا قباسلا فصلا مادختساب فرع cylinder لتعريف الاسطوانة بالقاعدة والارتفاع وعرف عميه الط ا رئق التالية : 1 - الباني الافت ا رضي)الارتفاع = 1 . ) 2 - الباني)نقطة المركز,نصف القطر, الارتفاع (. 3 - الباني)دائرة , ارتفاع(. 4 - حجم الاسطوانة . 4 - مساحة السطح الخارجي للاسطوانة.
- 37. That’s for today That’s for today guys !! Bye Bye !
- 38. That’s for today Enjoy and play !!
- 39. 2 bytes team Group : group link Mobile phone- Kinan : 0994385748 Facebook account : kinan’s account 2 bytes team