Free Boost Windows Startup Shareware and Freeware. Chameleon Delayer offers program launch options with delayed startup. Boost Windows 2009 Boost Windows 2009 is the award winning computer. Services subject to additional terms and other restrictions. Describes a free and fully Standard conformant C++ preprocessor library. A list of open source C++ libraries. Coastal Windows & Exteriors installs replacement windows in Beverly and Boston. Boost your home’s energy efficiency. Browse Windows By Style. Compile error in Windows CE 6.0., using 64 bit compiler and intrin.h my in own program. Same situation with boost 1.51.0 and 1.53.0 Could be. Boost (C++ libraries) - Wikipedia. Boost is a set of libraries for the C++ programming language that provide support for tasks and structures such as linear algebra, pseudorandom number generation, multithreading, image processing, regular expressions, and unit testing. It contains over eighty individual libraries. Most of the Boost libraries are licensed under the Boost Software License, designed to allow Boost to be used with both free and proprietary software projects. Many of Boost's founders are on the C++ standards committee, and several Boost libraries have been accepted for incorporation into both the C++ Technical Report 1 and the C++1. They range from general- purpose libraries like the smart pointer library, to operating system abstractions like Boost File. System, to libraries primarily aimed at other library developers and advanced C++ users, like the template metaprogramming (MPL) and domain- specific language (DSL) creation (Proto). In order to ensure efficiency and flexibility, Boost makes extensive use of templates. Boost has been a source of extensive work and research into generic programming and metaprogramming in C++. Some Boost libraries coexist as independent libraries. Author of several books on C++, Nicolai Josuttis contributed the Boost array library in 2. There are mailing lists devoted to Boost library use and library development, active as of 2. It is a permissive license in the style of the BSD license and the MIT license, but without requiring attribution for redistribution in binary form. Introduction to the Boost C++ Libraries. Volume 1 - Foundations. ISBN 9. 78- 9. 4- 9. Demming, Robert & Duffy, Daniel J. Introduction to the Boost C++ Libraries. Volume 2 - Advanced Libraries. ISBN 9. 78- 9. 4- 9. Mukherjee, Arindam (2. Learning Boost C++ Libraries. ISBN 9. 78- 1- 7. Polukhin, Antony (2. Boost C++ Application Development Cookbook. ISBN 9. 78- 1- 8. The Boost C++ Libraries. ISBN 9. 78- 0- 9. The Boost C++ Libraries (2 ed.). ISBN 9. 78- 1- 9. Siek, Jeremy G.; Lee, Lie- Quan & Lumsdaine, Andrew (2. The Boost Graph Library: User Guide and Reference Manual. ISBN 9. 78- 0- 2. Overview of utility classes from the Boost library. Utility classes are necessary in almost any C++ project of reasonable dimensions, but there is no standard way to approach this requirement. Often, teams code utility classes according to their requirements but with important pieces of the interface missing, thereby making it impossible for other project teams in the same organization to reuse the classes. The recommended Standard Template Library (STL) has only a few basic classes like hash, stack, and vector, so it can't effectively be used to replace legacy utility libraries. This article introduces several of the Boost utility classes, including tuple, static. You need some understanding of the standard STL to get the most from this article. All the code in this article has been tested using Boost 1. The boost: :tuple class. Sometimes you want a C++ function to return multiple values that are unrelated. The pre- STL way of doing this was to either make a struct of all the unrelated variables and return them or pass the arguments to the function as pointers or references - - but neither approach was a clean method that expressed programmer intent. The STL introduced pair, which you can use to aggregate unrelated pieces of data, but it can handle only two data objects at a time. To use a tuple of int, char, and float, you return a pair as follows. Enter the Boost tuple type. To use boost: :tuple, you must include the header file tuple. To perform tuple comparisons and tuple I/O, you need to include tuple. Creating a Boost tuple and printing the contents#include < iostream>. Note that the < < operator is overloaded for std: :ostream so that a tuple is output by dumping each individual tuple element. Key facts related to tuples. It's important to keep the following facts in mind when you're working with tuples: The number of elements that can form a tuple is currently limited to 1. Tuples may contain user- defined class types, but you must take care to ensure that the classes have proper constructors and copy constructors defined. Listing 2 shows a piece of code that results in a compile- time error because the copy constructor is private. Classes used with tuples must have proper copy constructors#include < tuple. To return a tuple from a function, you must invoke make. It's possible to create a tuple with temporary elements; the output from Listing 3 is (4 0). This routine has two variants, as shown in Listing 4. Note that it's also possible to set individual elements of a tuple using the get routine, although some compilers may not support this feature. Using the boost: :get routine #include < tuple. Assignments can't be made to the element thus accessed (see Listing 5). Tuples declared with the const qualifier may not be modified#include < tuple. Comparing tuples of unequal lengths results in a compile- time error. The operators work by comparing each individual element of the two participating tuples from left to right (see Listing 6). Relational operators with tuples#include < tuple. Note that if instead of string or int, you used a random user- defined class that didn't have the operators ==, !=, and so on defined, the result would be a compilation error. Back to top. Boost static assertions. Assertions are part of defensive programming in C/C++. The most common usage is as follows. The assert routine is valid only in debug mode. In release mode, when code is typically compiled with the preprocessor macro –DNDEBUG, the effect is as if the assert doesn't exist. Static assertions build on this basic concept, except that static assertions are valid only at compile time. In addition, static assertions don't generate any code. For example, suppose you do some bit manipulation in an integer variable and expect it. This may not be the case on all operating system platforms (see Listing 7). Using Boost static assertions to verify the size of variables#include < boost/static. No compiler- specific option like DNDEBUG is required, and you don't need to provide a library to the linker - - the lone header is sufficient. If the assertion is valid, the code compiles smoothly. But if the assumption is invalid, as may be the case with some 6. A typical message when compiling with g++- 3. In function `int main()'. STATIC. Here are some typical real- world situations in which you should consider using a static assertion: Bounds checking of statically declared arrays Validating the size of primary and user- defined variables. Allowing a template class or function to be instantiated with only certain data types. Behavior of Boost static assertions. You can use Boost static assertions in a class, function, or namespace scope; you can also use them with templates. The examples in Listing 8 clarify the concepts. Using Boost static assertions to limit class instantiations#include < iostream>. In the case of an unsigned long, the is. The code ensures that the types handled in function f. A or derivatives thereof. By using Boost's static assert macro and is. Restricting functions to handle only specific data types#include < iostream>. Typically, srand uses a new seed value to initialize rand (see Listing 1. Code to generate random numbers in traditional UNIX#include < stdlib. To understand what srand does, compile Listing 1. When you do, you'll observe that rand isn't really random - - the executable prints the same set of values every time. To introduce randomness into the code, you use srand, which initializes rand with a seed value. Because the value of time is different each time the program is invoked, the code prints different values for separate invocations. Use the Boost random- number generators. The Boost random- number generators are located in the boost/random folder. In addition, for the sake of convenience, the random. The Boost random interface is divided into two parts: a random- number generator and a distribution within which the random number must lie. This article discusses the uniform. Listing 1. 1 uses the uniform. Listing 1. 2 uses another engine: kreutzer. Listing 1. 2: Combining the uniform. Back to top. Overview of the boost: :pool library. The Boost pool library introduces tools that you can use for fast memory allocation. Proper alignment of memory chunks is guaranteed. According to the Boost documentation, pool usage is recommended when you're allocating and deallocating many small objects. Another less obvious benefit of using pools is that as a programmer, you don't have to worry about memory leaks: they're automatically managed internally by the Boost library. To use the pool library, you don't have to provide specific libraries at link time - - the header files alone get the job done. Multiple interfaces are available for the pool library: Pool interface - - A vanilla interface that works as a malloc alternative. To use this interface, include the pool. Object pool interface - - An object- aware interface that calls the constructor. You. can also create vanilla objects without calling their constructors using this. The definitions are provided in the object. Listing 1. 3 introduces the pool and object. Note the following: The pool interface needs to know the size of each individual element and not the type, because it's a malloc- style allocator and doesn't call constructors. The malloc routine from the pool interface returns a void*. The object- pool interface needs the type information, because constructors are called. The malloc/construct routine from the object- pool interface returns a pointer to the type. The malloc routine doesn't call the constructor, but construct does. The scope of the elements created using either the pool interface or the object- pool interface is the same as that of the pool from which they're created. To release memory from the pool interface, call the purge. It frees every memory block you created earlier and invalidates all the pointers returned from the allocator routines. To free individual elements, call the free routine from the pool interface. For example, if t is the pool created using the pool interface and m is a pointer allocated from t, then t. The underlying structure of a singleton pool has static member functions declared for malloc, free, and so on, and the constructor is private. The first parameter in the singleton declaration is known as a tag - - it allows different sets of singleton pools to exist (for example, multiple pools for int, each of which serves a different purpose). You must include the singleton. Consider the following snippet. The first is a general- purpose allocation and can serve requests for any number of contiguous chunks. The result is maintenance overhead down the line. Listing 1. 5 details the use of boost: :program. This is the standard template recommended for use in your code. Listing 1. 5. Listing 1. The options. In this case, the help option doesn't require any arguments, but the file option requires a string argument. The store and notify methods help store the data within the vmap object. When you check whether help is the relevant command option for the program (this is what vmap. This implies that operator < < is defined for the options. For example, here's a. For example, to retrieve the argument to file, you can call vmap. In addition, you often must use an option multiple times so that all of the option's arguments are collected. For example, you may want to use –h and –help to print the available commands. Listing 1. 6 illustrates these features. Using a shorter option variant and allowing for multiple invocations of command options#include < string>. Note that the longer option (help) must precede the shorter option (h) for the code to work properly. Instead of a single string, the file option is now defined with a vector of strings. If the –file option is specified multiple times, then all the arguments to the command option collected across specifications are stored in the associated vector< string>.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. Archives
January 2017
Categories |