Book Image

Boost C++ Application Development Cookbook - Second Edition

By : Anton Polukhin Alekseevic
Book Image

Boost C++ Application Development Cookbook - Second Edition

By: Anton Polukhin Alekseevic

Overview of this book

If you want to take advantage of the real power of Boost and C++ and avoid the confusion about which library to use in which situation, then this book is for you. Beginning with the basics of Boost C++, you will move on to learn how the Boost libraries simplify application development. You will learn to convert data such as string to numbers, numbers to string, numbers to numbers and more. Managing resources will become a piece of cake. You’ll see what kind of work can be done at compile time and what Boost containers can do. You will learn everything for the development of high quality fast and portable applications. Write a program once and then you can use it on Linux, Windows, MacOS, Android operating systems. From manipulating images to graphs, directories, timers, files, networking – everyone will find an interesting topic. Be sure that knowledge from this book won’t get outdated, as more and more Boost libraries become part of the C++ Standard.
Table of Contents (19 chapters)
Title Page
Credits
About the Author
About the Reviewer
www.PacktPub.com
Customer Feedback
Preface

Storing any functional objects in a variable


Consider the situation when you are developing a library that has its API declared in the header files and implementation in the source files. This library shall have a function that accepts any functional objects. Take a look at the following code:

// making a typedef for function pointer accepting int 
// and returning nothing 
typedef void (*func_t)(int); 

// Function that accepts pointer to function and 
// calls accepted function for each integer that it has.
// It cannot work with functional objects :( 
void process_integers(func_t f); 

// Functional object 
class int_processor { 
   const int min_; 
   const int max_; 
   bool& triggered_; 

public: 
    int_processor(int min, int max, bool& triggered) 
        : min_(min) 
        , max_(max) 
        , triggered_(triggered) 
    {} 

    void operator()(int i) const { 
        if (i < min_ || i > max_) { 
            triggered_ = true; 
        } 
    } 
};

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