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Memory Management In C++

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ShriKant Vashishtha
ShriKant Vashishtha

This is one of my first presentations on Advanced C++ stuff

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Memory Management in C++ Advanced techniques and idioms -ShriKant Vashishtha
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Distinct Memory areas in C++ ,[object Object],[object Object],[object Object],[object Object],[object Object]
Distinct Memory areas in C++ ,[object Object],[object Object],[object Object],[object Object]
Distinct Memory areas in C++ ,[object Object],[object Object],[object Object],[object Object],[object Object]
Distinct Memory areas in C++ ,[object Object],[object Object],[object Object],[object Object]
Distinct Memory areas in C++ ,[object Object],[object Object],[object Object],[object Object],[object Object]
Pointers Vs References ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Pointers Vs References ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Pointers Vs References ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Conclusions: Pointers Vs References ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Conclusions: Pointers Vs References ,[object Object],[object Object]
Conclusions: Pointers Vs References ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
‘new’ operator ,[object Object],[object Object],[object Object],[object Object]
‘ new’ operator Vs operator new ,[object Object],[object Object],[object Object],[object Object]
‘ new’ operator Vs operator new ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
‘ new’ operator Vs operator new ,[object Object]
Placement new ,[object Object],[object Object],[object Object]
Placement new ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Summary: new operator Vs operator new Vs placement new ,[object Object],[object Object],[object Object],[object Object]
The C++ Object Model ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Float_x ---------------------- __vptr__Point --------------------- --------------------- Point::~Point() Point::print(ostream &) static int Point:: _point_count static int Point::PointCount() Point pt; Virtual table for Point type_info for Point Point:: Point(float) Float Point::x()
The C++ Object Model ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
C++ Object Model: Evaluation ,[object Object],[object Object]
C++ Object Model: Inheritance ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],The most compact and the most efficient access of base class data members Drawback: Any change to data members requires recompiling
C++ Object Model: Object Mechanics ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],expand X * px = new X 1. construct _result 2. result replaces local xx expand xx.foo(): suppress virtual mechanics expand px->foo() using virtual mechanics expand delete px;
The type of a Pointer ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Can only hold an address and not actually operate on the object it addresses
Object deletion and Memory deallocation ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Object deletion and Memory deallocation ,[object Object]
Object deletion and Memory deallocation ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
operator delete function ,[object Object],[object Object],[object Object],[object Object]
C++ equivalent of malloc-free ,[object Object],[object Object]
Arrays ,[object Object],[object Object]
Why overload new/delete operator? ,[object Object]
Common memory problems ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Common memory problems ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Common memory problems ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Common memory problems ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Common memory problems ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Problems with Pointer ,[object Object],[object Object],[object Object],[object Object],[object Object]
Solutions to the problems with Pointers
Use Destructors ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Read animal info from istream object and return a pointer to the object of appropriate ALA type Can lead to resource leak in exceptional conditions.
Use Destructors ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Use Destructors ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Save ptr to object delete ptr to object
Smart Pointers(auto_ptr template) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Save ptr to object delete ptr to object

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Memory Management In C++

  • 1. Memory Management in C++ Advanced techniques and idioms -ShriKant Vashishtha
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