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Optimized C++A Proven Techniques for Heightened Performance

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Optimized C++A Proven Techniques for Heightened Performance

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Kurt Guntheroth

Optimized C++

PROVEN TECHNIQUES FOR HEIGHTENED PERFORMANCE

Kurt Guntheroth

Optimized C++

Boston Farnham Sebastopol

Tokyo

Beijing Boston Farnham Sebastopol

Tokyo

Beijing

978-1-491-92206-4

[LSI]

Optimized C++

by Kurt Guntheroth

Printed in the United States of America.

Published by O’Reilly Media, Inc., 1005 Gravenstein Highway North, Sebastopol, CA 95472.

O’Reilly books may be purchased for educational, business, or sales promotional use. Online editions are

also available for most titles (http://safaribooksonline.com). For more information, contact our corporate/

institutional sales department: 800-998-9938 or corporate@oreilly.com.

Editors: Meghan Blanchette and Andy Oram

Acquisition Editor: Meghan Blanchette

Production Editor: Nicole Shelby

Copyeditor: Rachel Head

Proofreader: Jasmine Kwityn

Indexer: Judy McConville

Interior Designer: David Futato

Cover Designer: Randy Comer

Illustrator: Rebecca Demarest

April 2016: First Edition

Revision History for the First Edition

2016-04-27: First Release

See http://oreilly.com/catalog/errata.csp?isbn=9781491922064 for release details.

The O’Reilly logo is a registered trademark of O’Reilly Media, Inc. Optimized C++, the cover image, and

related trade dress are trademarks of O’Reilly Media, Inc.

While the publisher and the author have used good faith efforts to ensure that the information and

instructions contained in this work are accurate, the publisher and the author disclaim all responsibility

for errors or omissions, including without limitation responsibility for damages resulting from the use of

or reliance on this work. Use of the information and instructions contained in this work is at your own

risk. If any code samples or other technology this work contains or describes is subject to open source

licenses or the intellectual property rights of others, it is your responsibility to ensure that your use

thereof complies with such licenses and/or rights.

Everyone thanks their spouse for helping make a book possible. It’s trite, I know. My wife

Renee Ostler made this book possible by giving me permission to take months o work,

by giving me time and space to focus on writing, and by staying up late asking me ques‐

tions about optimizing C++ code, even though she wasn’t particularly engaged by the

topic, just to show her support. She made this project important to her because it was

important to me. No author could ask for more.

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用c语言编写程序，读入一行字符（长度小于1000），将其中出现的小写字母替换为大写字母并输出。【注意】输入输出各占一行；运行效果应如下所示（第1行为输入，第2行为输出），格式错误算结果错误。 Microsoft Edge is the only browser optimized for Windows. MICROSOFT EDGE IS THE ONLY BROWSER OPTIMIZED FOR WINDOWS.

以下是用C语言编写的程序，可以实现读入一行字符，将其中出现的小写字母替换为大写字母并输出： ```c #include <stdio.h> #include <ctype.h> int main() { char str[1001]; fgets(str, 1001, stdin); for (int i = 0; str[i] != '\0'; i++) {

用中文总结以下内容： A number of experimental and numerical investigations have been conducted to study the MBPP stack and wavy flow field characteristics with various designs [10,11]. T. Chu et al. conducted the durability test of a 10-kW MBPP fuel cell stack containing 30 cells under dynamic driving cycles and analyzed the performance degradation mechanism [12]. X. Li et al. studied the deformation behavior of the wavy flow channels with thin metallic sheet of 316 stainless steel from both experimental and simulation aspects [13]. J. Owejan et al. designed a PEMFC stack with anode straight flow channels and cathode wavy flow channels and studied the in situ water distributions with neutron radiograph [14]. T. Tsukamoto et al. simulated a full-scale MBPP fuel cell stack of 300 cm2 active area at high current densities and used the 3D model to analyze the in-plane and through-plane parameter distributions [15]. G. Zhang et al. developed a two-fluid 3D model of PEMFC to study the multi-phase and convection effects of wave-like flow channels which are symmetric between anode and cathode sides [16]. S. Saco et al. studied the scaled up PEMFC numerically and compared straight parallel, serpentine zig-zag and straight zig-zag flow channels cell with zig-zag flow field with a transient 3D numerical model to analyze the subfreezing temperature cold start operations [18]. P. Dong et al. introduced discontinuous S-shaped and crescent ribs into flow channels based on the concept of wavy flow field for optimized design and improved energy performance [19]. I. Anyanwu et al. investigated the two-phase flow in sinusoidal channel of different geometric configurations for PEMFC and analyzed the effects of key dimensions on the droplet removal in the flow channel [20]. Y. Peng et al. simulated 5-cell stacks with commercialized flow field designs, including Ballard-like straight flow field, Honda-like wavy flow field and Toyota-like 3D mesh flow field, to investigate their thermal management performance [21]. To note, the terms such as sinusoidal, zig-zag, wave-like and Sshaped flow channels in the aforementioned literatures are similar to the so called wavy flow channels in this paper with identical channel height for the entire flow field. The through-plane constructed wavy flow channels with periodically varied channel heights are beyond the scope of this paper [22,23].

通过实验和数值计算研究了MBPP及波浪流动场特性的不同设计（10，11），Chu等人进行了包含30个电池的10 kW MBPP燃料电池堆的耐久性测试，分析了性能退化机制（12），Li等人从实验和模拟两个方面研究了316不锈钢薄金属板的波浪流道变形行为（13），Owejan等人设计了具有阳极直流道和阴极波浪流道的PEMFC堆，并用中子射线图研究了原位水分布（14），Tsukamoto等人模拟了30

Traditional network security situation prediction methods depend on the accuracy of historical situation value. Moreover, there are differences in correlation and importance among various network security factors. In order to solve these problems, a combined prediction model based on the temporal convolution attention network (TCAN) and bi-directional gate recurrent unit (BiGRU) network optimized by singular spectrum analysis (SSA) and improved quantum particle swarm optimization algorithm (IQPSO) was proposed. This model was first decomposed and reconstructed into a series of subsequences through the SSA of network security situation data. Next, a prediction model of TCAN-BiGRU was established for each subsequence, respectively. The TCN with relatively simple structure was used in the TCAN to extract features from the data. Besides, the improved channel attention mechanism (CAM) was used to extract important feature information from TCN. Afterwards, the before-after status of the learning situation value of the BiGRU neural network was used to extract more feature information from sequences for prediction. Meanwhile, an improved IQPSO was proposed to optimize the hyper-parameter of the BiGRU neural network. Finally, the prediction results of subsequence were superimposed to obtain the final predicted value. In the experiment, on the one hand, the IQPSO was compared with other optimization algorithms; and the results showed that the IQPSO has better optimization performance; on the other hand, the comparison with traditional prediction methods was performed through the simulation experiment and the established prediction model; and the results showed that the combined prediction model established has higher prediction accuracy.

答：基于时间卷积注意网络（TCAN）和双向门驱动单元（BiGRU）网络，结合奇异谱分析（SSA）和改进量子粒子群优化算法（IQPSO）的联合预测模型，解决了传统网络安全态势预测方法依赖于历史态势值的准确性，以及各网络安全因子之间的相关性和重要性差异问题，在实验中，一方面将IQPSO与其他优化算法进行比较，结果表明IQPSO具有更好的优化性能；另一方面，通过仿真实验和建立的预测模型与传统预测方法进行

value has been optimized out

"value has been optimized out" 的意思是“值已被优化掉”，通常出现在调试程序时。这意味着编译器已经对代码进行了优化，将某些变量的值删除或简化，以提高程序的性能。因此，在调试时，您可能无法访问或查看这些变量的值。

用c语言编写程序，读入一行字符（长度小于1000），从中找出出现频率最高的字母（大小写算不同字母）出现的次数并输出。【注意】输入输出各占一行；运行效果应如下所示（第1行为输入，第2行为输出），格式错误算结果错误。 Microsoft Edge is the only browser optimized for Windows. 7

输出结果应该为： s 5 以下是代码实现： #include <stdio.h> #include <ctype.h> int main() { char str[1001]; int freq[26] = {0}; int max_freq = 0; char max_char; fgets(str, 1001, stdin); for

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