The Experts below are selected from a list of 15 Experts worldwide ranked by ideXlab platform
Ronald J. Leach - One of the best experts on this subject based on the ideXlab platform.
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Structured Data Types in C
Object-Oriented Design and Programming with C++, 1995Co-Authors: Ronald J. LeachAbstract:The C++ concept of a class has some aspects in common with structs in C. This is clear from the historical origin of C++. This chapter describes the relationship between classes and structs. An object is called static if it does not use dynamic storage allocation and does not include any member functions. Static objects have several important features. An object that is not static is called a dynamic object. A static object uses the Default Constructor provided by the compiler. This Constructor is invoked before any executable statements—statements other than data definitions or declarations—are executed. A Default destructor is used with static objects. These destructors are created by the compiler. The Default destructor is invoked for a static object when the function main ( ) is exited. The chapter discusses template construction in C++ programs. The template construction in C++ programs allows the abstraction to be used in different contexts. A template allows one to develop a general set of operations and data that apply to any type of abstraction of data organization. The abstract operations are the same; only the underlying structure of the data changes.
Clifford A. Shaffer - One of the best experts on this subject based on the ideXlab platform.
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A Practical Introduction to Data Structures and Algorithm Analysis Third Edition (Java Version)
2020Co-Authors: Clifford A. ShafferAbstract:class Graph has methods to return the number of vertices and edges (methods n and e, respectively). Function weight returns the weight of a given edge, with that edge identified by its two incident vertices. For example, calling weight(0, 4) on the graph of Figure 11.1 (c) would return 4. If no such edge exists, the weight is defined to be 0. So calling weight(0, 2) on the graph of Figure 11.1 (c) would return 0. Functions setEdge and delEdge set the weight of an edge and remove an edge from the graph, respectively. Again, an edge is identified by its two incident vertices. setEdge does not permit the user to set the weight to be 0, because this value is used to indicate a non-existent edge, nor are negative edge weights permitted. Functions getMark and setMark get and set, respectively, a requested value in the Mark array (described below) for Vertex V . Nearly every graph algorithm presented in this chapter will require visits to all neighbors of a given vertex. Two methods are provided to support this. They work in a manner similar to linked list access functions. Function first takes as input a vertex V , and returns the edge to the first neighbor for V (we assume the neighbor list is sorted by vertex number). Function next takes as input Vertices V1 and V2 and returns the index for the vertex forming the next edge with V1 after V2 on V1’s Sec. 11.2 Graph Implementations 407 // Graph abstract class. This ADT assumes that the number // of vertices is fixed when the graph is created. class Graph { private: void operator =(const Graph&) {} // Protect assignment Graph(const Graph&) {} // Protect copy Constructor public: Graph() {} // Default Constructor virtual Graph() {} // Base destructor // Return the number of vertices in the graph virtual int n() =0; // Return the current number of edges in the graph virtual int e() =0; // Store an edge from "v1" to "v2" with weight "wgt" virtual void setEdge(int v1, int v2, int wgt) =0; // Delete the edge going from "v1" to "v2" virtual void delEdge(int v1, int v2) =0; // Return weight of the edge from "v1" to "v2". // Return 0 if no such edge exists. virtual int weight(int v1, int v2) =0; // Get the mark value for vertex "v" virtual int getMark(int v) =0; // Set the mark value for vertex "v" to be "val" virtual void setMark(int v, int val) =0; // Return the index of the first neighbor for vertex "v" virtual int first(int v) =0; // Return the index of the next neighbor // (after "v2") for vertex "v1" virtual int next(int v1, int v2) =0; }; Figure 11.5 A graph ADT. This ADT assumes that the number of vertices is fixed when the graph is created, but that edges can be added and removed. It also supports a mark array to aid graph traversal algorithms.
Andy H. Register - One of the best experts on this subject based on the ideXlab platform.
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Simplify Using get, set, fieldnames, and struct
A Guide to MATLAB® Object-Oriented Programming, 2020Co-Authors: Andy H. RegisterAbstract:The paper develops the implementations for a small but very important collection of member functions. In their order of development, the functions belonging to this so-called group-of-eight are as follows: Default Constructor (e.g., cShape); subsref; subsasgn; display; fieldnames; struct; get; and set.
Sandeep Ahluwalia - One of the best experts on this subject based on the ideXlab platform.
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Optimizing C and C++ Code
The Firmware Handbook, 2020Co-Authors: Sandeep AhluwaliaAbstract:Publisher Summary This chapter discusses optimization techniques for C and C++ code developed for real-time and embedded systems. When arrays of structures are involved, the compiler performs a multiply by the structure size to perform the array indexing. If the structure size is a power of 2, an expensive multiply operation will be replaced by an inexpensive shift operation. Thus, keeping structure sizes aligned to a power of 2 will improve performance in array indexing. If the case labels are in a narrow range, the compiler does not generate a if-else-if cascade for the switch statement. Instead, it generates a jump table of case labels along with manipulating the value of the switch to index the table. Whereas, if the case labels are placed far apart, the compiler will generate if-else-if cascaded code with comparing for each case label and jumping to the action for leg on hitting a label match. By placing the frequent case labels first, you can reduce the number of comparisons that will be performed for frequently occurring scenarios. As far as possible, keep the Constructor lightweight. The Constructor will be invoked for every object creation. Thus, optimizing the Constructor can provide big boost in performance. If an array of objects is present, the Default Constructor for the object should be optimized first as the Constructor gets invoked for every object in the array.
Yang Jinliang - One of the best experts on this subject based on the ideXlab platform.
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Symbian OS Memory Management Mechanism
Computer Programming Skills & Maintenance, 2020Co-Authors: Yang JinliangAbstract:Symbian operating system uses the TRAP mechanism to capture system exceptions and control memory allocation process.In case of system exception,the cleanup stack structure can ensure the system memory leak does not occur.Through two steps Constructor,programmers can modify the C++ Default Constructor rules to ensure the memory safety.
