Advanced C++ Topics. Alexander Warg, 2017
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1 Advanced C++ Topics Alexander Warg, 2017 M I C R O K E R N E L M A D E I N G E R M A N Y
2 Overview WHAT IS BEHIND C++ Language Magics Object Life Time Object Memory Layout INTRODUCTION TO TEMPLATES Template Function Template Class WHAT I DO NOT EXPLAIN Standard C++ Library
3 C++ vs C Some more keywords new, delete, class, virtual, mutable, explicit... Stricter type system e.g. no automatic conversion from void * custom class types strictly typed enums (C++11) Function overloading / Operator overloading multiple functions with the same name but different arguments Extensible hierarchical type system classes and inheritance Generic programming via templates
4 CONSTRUCTION AND DESTRUCTION Constructors: Special Member Functions for object initialization Same name as the class No return type
5 CONSTRUCTION AND DESTRUCTION Constructors: Special Member Functions for object initialization Same name as the class No return type Destructors: Special Member Functions for object destruction Name: ~Classname() No return type No arguments
6 CONSTRUCTORS (CLASS FOO)
7 CONSTRUCTORS (CLASS FOO) Foo() -> Default Constructor No arguments Generated by Compiler if no other Constructors
8 CONSTRUCTORS (CLASS FOO) Foo() -> Default Constructor No arguments Generated by Compiler if no other Constructors Foo(Type x) -> Conversion Constructor Is used to cast type Type to Foo (implicitly) (see keyword explicit)
9 CONSTRUCTORS (CLASS FOO) Foo() -> Default Constructor No arguments Generated by Compiler if no other Constructors Foo(Type x) -> Conversion Constructor Is used to cast type Type to Foo (implicitly) (see keyword explicit) Foo(Foo const &o) -> Copy Constructor Always generated by Compiler if not provided (related to operator = (Foo const &o), see later)
10 CONSTRUCTORS (CLASS FOO) Foo() -> Default Constructor No arguments Generated by Compiler if no other Constructors Foo(Type x) -> Conversion Constructor Is used to cast type Type to Foo (implicitly) (see keyword explicit) Foo(Foo const &o) -> Copy Constructor Always generated by Compiler if not provided (related to operator = (Foo const &o), see later) Foo(Type a, Type b, Type c) -> Normal Constructor
11 CONSTRUCTORS (CLASS FOO) C++0X Foo(Foo &&o) -> Move Constructor (related to operator = (Foo &&o), see later)
12 CONSTRUCTORS (CLASS FOO) C++0X Foo(Foo &&o) -> Move Constructor (related to operator = (Foo &&o), see later) Type &&x -> RValue refernce Fast optimized move operations Support for perfect forwarding
13 TYPE CONVERSION / CAST Implicit type conversion among integer types (incl. enum) conversion ctor? conversion operator? from pointers/references of derived classes to pointers/references to base classes Explicit type conversion (casts) C++ has three (actually four) types of casts static_cast<type>(...) reinterpret_cast<type>(...) dynamic_cast<type>(...) const_cast<type>(...)
14 POLYMORPHISM (ADVANCED) Virtual Functions Support for Overriding functions in C++ Pure Virtual Functions (Abstract Function) class A { void func() = 0; }; <A> cannot be instantiated (is abstract) Multiple Inheritance class A : public B, public C {...};
15 Virtual deletion... POLYMORPHISM VIRTUAL DTOR
16 POLYMORPHISM II MULTIPLE INHERITANCE
17 POLYMORPHISM II MULTIPLE INHERITANCE Car name()
18 POLYMORPHISM II MULTIPLE INHERITANCE Car name() Boat name()
19 POLYMORPHISM II MULTIPLE INHERITANCE Object cnt Car name() Boat name()
20 POLYMORPHISM II MULTIPLE INHERITANCE Object cnt Car name() Boat name() Amphi
21 POLYMORPHISM II MULTIPLE INHERITANCE Amphi Car Object Boat Object
22 POLYMORPHISM II MULTIPLE INHERITANCE Amphi Amphi Car Boat Car Boat Object Object Object
23 TEMPLATES FUNCTION TEMPLATES Functions that operate on a Generic Type (e.g. T)
24 TEMPLATES FUNCTION TEMPLATES Functions that operate on a Generic Type (e.g. T) int max(int a, int b) { return a>b?a:b; }
25 TEMPLATES FUNCTION TEMPLATES Functions that operate on a Generic Type (e.g. T) int max(int a, int b) { return a>b?a:b; } int a, b; int x = max(a, b);
26 TEMPLATES FUNCTION TEMPLATES Functions that operate on a Generic Type (e.g. T) int max(int a, int b) { return a>b?a:b; } int a, b; int x = max(a, b); double a, b; double x = max(a, b);
27 TEMPLATES FUNCTION TEMPLATES Functions that operate on a Generic Type (e.g. T) template< typename T > T max(t a, T b) { return a>b?a:b; } int a, b; int x = max(a, max<int>(a, b); b); double a, b; double x = max(a, max<double>(a, b); b);
28 TEMPLATES FUNCTION TEMPLATES Functions that operate on a Generic Type (e.g. T) template< typename T > T max(t a, T b) { return a>b?a:b; } int a, b; int x = max(a, b); double a, b; double x = max(a, b);
29 TEMPLATES CLASS TEMPLATES Classes with members of Generic Types (e.g. T)
30 TEMPLATES CLASS TEMPLATES Classes with members of Generic Types (e.g. T) class List_item { List_item *_next, *_prev; void *_data; };
31 TEMPLATES CLASS TEMPLATES Classes with members of Generic Types (e.g. T) template< typename T > class List_item { List_item *_next, *_prev; void T *_data; *_data; };
32 DON'T DO THIS... Too Much operator overloading Keep usual semantics Avoid implicit conversion operators using namespace <X> in Header Files #define... Use enum's for constant values Use templates for functions
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