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Professional C++, 3rd Edition by Marc Gregoire

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Chapter 17Mastering STL Algorithms

  • Algorithms explained
  • Lambda expressions explained
  • Function objects explained
  • The details of the STL algorithms
  • A larger example: auditing voter registrations

Please note that all the code examples for this chapter are available as a part of this chapter’s code download on the book’s website at www.wrox.com/go/proc++3e on the Download Code tab.

As Chapter 16 shows, the STL provides an impressive collection of generic data structures. Most libraries stop there. The STL, however, contains an additional assortment of generic algorithms that can, with some exceptions, be applied to elements from any container. Using these algorithms, you can find, sort, and process elements in containers, and perform a whole host of other operations. The beauty of the algorithms is that they are independent not only of the types of the underlying elements, but also of the types of the containers on which they operate. Algorithms perform their work using only the iterator interfaces.

Many of the algorithms accept a callback, which can be a function pointer or something that behaves like a function pointer, such as an object with an overloaded operator() or an inline lambda expression. Conveniently, the STL provides a set of classes that can be used to create callback objects for the algorithms. These callback objects are called function objects, or just functors.

OVERVIEW OF ALGORITHMS

The “magic” behind ...

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