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C2x
C2x is an informal name for the next (after C17) major C language standard revision. It is expected to be voted on in 2023 and would therefore become C23. The most recent publicly available draft of C23 was released on January 24, 2023. The first WG14 meeting for the C2x draft was held in October 2019, then virtual remote meetings were held due to COVID-19 pandemic in March/April 2020, October/November 2020, March/April 2021, August/September 2021, November/December 2021, January/February 2022, May 2022, July 2022, January 2023. Features Changes integrated into the latest C23 draft are: ;Standard Library (new functions) :* add memset_explicit() function in to erase sensitive data, where memory store must always be performed regardless of optimizations. :* add memccpy() function in to efficiently concatenate strings - similar to POSIX and SVID C extensions. :* add strdup() and strndup() functions in to allocate a copy of a string – similar to POSIX and SVID C extensions. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
C Language
C (''pronounced like the letter c'') is a general-purpose computer programming language. It was created in the 1970s by Dennis Ritchie, and remains very widely used and influential. By design, C's features cleanly reflect the capabilities of the targeted CPUs. It has found lasting use in operating systems, device drivers, protocol stacks, though decreasingly for application software. C is commonly used on computer architectures that range from the largest supercomputers to the smallest microcontrollers and embedded systems. A successor to the programming language B, C was originally developed at Bell Labs by Ritchie between 1972 and 1973 to construct utilities running on Unix. It was applied to re-implementing the kernel of the Unix operating system. During the 1980s, C gradually gained popularity. It has become one of the most widely used programming languages, with C compilers available for practically all modern computer architectures and operating systems. C has be ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
C17 (C Standard Revision)
C17 is the informal name for ISO/IEC 9899:2018, the most recent standard for the C programming language, prepared in 2017 and published in June 2018. It replaced C11 (standard ISO/IEC 9899:2011). C17 will be superseded by C2x. Since it was under development in 2017, and officially published in 2018, C17 is also commonly referred to as C18. GCC, for example, treats the commands -std=c17 and -std=c18 as equivalent, and the C-Standard page on the ISO-9899 wiki refers to ISO/IEC 9899:2018 as C18, only noting later that the standard is sometimes called C17. Changes from C11 C17 addressed defects in C11 without introducing new language features. The __STDC_VERSION__ macro is increased to the value 201710L. For a detailed list of changes from the previous standard, see ''Clarification Request Summary for C11''. Compiler support List of compilers supporting C17: * GCC 8.1.0 * LLVM Clang 7.0.0 * IAR EWARM v8.40.1 * Microsoft Visual C++ VS 2019 (16.8) See also * C++98, C++ ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Variadic Macro
A variadic macro is a feature of some computer programming languages, especially the C preprocessor, whereby a macro may be declared to accept a varying number of arguments. Variable-argument macros were introduced in 1999 in the ''ISO/IEC 9899:1999'' (C99) revision of the C language standard, and in 2011 in ''ISO/IEC 14882:2011'' (C++11) revision of the C++ language standard. Support for variadic macros with no arguments was added in C++20 and will be added in C23. Declaration syntax The declaration syntax is similar to that of variadic functions: a sequence of three full stops "" is used to indicate that one or more arguments must be passed. During macro expansion each occurrence of the special identifier in the macro replacement list is replaced by the passed arguments. Additionally, regular macro arguments may be listed before the ..., but regular arguments may not be listed after the .... No means is provided to access individual arguments in the variable argument lis ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Typeof
typeof, alternately also typeOf, and TypeOf, is an operator provided by several programming languages to determine the data type of a variable. This is useful when constructing programs that must accept multiple types of data without explicitly specifying the type. In languages that support polymorphism and type casting, the typeof operator may have one of two distinct meanings when applied to an object. In some languages, such as Visual Basic, the typeof operator returns the dynamic type of the object. That is, it returns the true, original type of the object, irrespective of any type casting. In these languages, the typeof operator is the method for obtaining run-time type information. In other languages, such as C# or D and, to some degree, in C (as part of nonstandard extensions and proposed standard revisions),https://gcc.gnu.org/onlinedocs/gcc/Typeof.html "Typeof" in Using the GNU Compiler Collection the typeof operator returns the static type of the operand. That is, i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
C++23
C23 or C-23 may refer to: Vehicles ;Aircraft * Beechcraft C23 Musketeer, an American civil utility aircraft * Caspar C 23, a German sport aircraft * Caudron C.23, a French bomber biplane * Lockheed C-23 Altair, an American military transport * Short C-23 Sherpa, an American military transport ;Automobiles * Sauber C23, a Swiss Formula One car ;Ships and boats * , a C-class submarine of the Royal Navy * Maltese patrol boat ''C23'', involved in the ''C23'' tragedy Other uses * C2x, a proposed revision of the C programming language * C-23 (card game), a collectible card game by Wizards of the Coast * C23 road (Namibia) * Bishop's Opening, a chess opening * Caldwell 23, a spiral galaxy * Gallbladder cancer Gallbladder cancer is a relatively uncommon cancer, with an incidence of fewer than 2 cases per 100,000 people per year in the United States. It is particularly common in central and South America, central and eastern Europe, Japan and northern In ... See also * List of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Storage Class Specifier
Storage may refer to: Goods Containers * Dry cask storage, for storing high-level radioactive waste * Food storage * Intermodal container, cargo shipping * Storage tank Facilities * Garage (residential), a storage space normally used to store cars * Mail storage, storage by mail or delivery service * Self storage, a public storage facility * Warehouse, a commercial building for storage of goods Technology *Cloud storage *Computer data storage, a means to retain digital data *Data storage, general recording and retention of information *Energy storage *Specific storage, of groundwater in an aquifer Arts and entertainment * ''Storage'' (film), a 2009 Australian horror film * ''The Storage'', a 2011 Finnish film * ''Storage'' (album), a 1988 album by Merzbow * ''Storage Wars'', a reality television show * "Storage Wars", an episode of ''One Day at a Time'' (2017 TV series) Other * Storage (memory), a psychological and physiological process See also * * * Container (disambig ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Type Inference
Type inference refers to the automatic detection of the type of an expression in a formal language. These include programming languages and mathematical type systems, but also natural languages in some branches of computer science and linguistics. Nontechnical explanation Types in a most general view can be associated to a designated use suggesting and restricting the activities possible for an object of that type. Many nouns in language specify such uses. For instance, the word leash indicates a different use than the word line. Calling something a table indicates another designation than calling it firewood, though it might be materially the same thing. While their material properties make things usable for some purposes, they are also subject of particular designations. This is especially the case in abstract fields, namely mathematics and computer science, where the material is finally only bits or formulas. To exclude unwanted, but materially possible uses, the concept of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Automatic Variable
__NOTOC__ In computer programming, an automatic variable is a local variable which is allocated and deallocated automatically when program flow enters and leaves the variable's scope. The scope is the lexical context, particularly the function or block in which a variable is defined. Local data is typically (in most languages) invisible outside the function or lexical context where it is defined. Local data is also invisible and inaccessible to a ''called'' function,unless it is a nested function, which itself is ''defined'' along that local data but is not deallocated, coming back in scope as the execution thread returns to the caller. Automatic local variables primarily applies to recursive lexically-scoped languages.although they exist in a somewhat similar, but not identical, form also in recursive languages with dynamic scoping, such as older variants of LISP Automatic local variables are normally allocated in the stack frame of the procedure in which they are declared.un ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Variable-length Array
In computer programming, a variable-length array (VLA), also called variable-sized or runtime-sized, is an array data structure whose length is determined at run time (instead of at compile time). In C, the VLA is said to have a variably modified type that depends on a value (see Dependent type). The main purpose of VLAs is to simplify programming of numerical algorithms. Programming languages that support VLAs include Ada (programming language), Ada, Algol 68 (for non-flexible rows), APL (programming language), APL, C99 (although subsequently relegated in C11 (C standard revision), C11 to a conditional feature, which implementations are not required to support; on some platforms, VLAs could be implemented previously with alloca() or similar functions) and C Sharp (programming language), C# (as unsafe-mode stack-allocated arrays), COBOL, Fortran, Fortran 90, J (programming language), J, and Object Pascal (the language used in Borland Delphi and Lazarus (software), Lazarus, that uses ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
GNU Compiler Collection
The GNU Compiler Collection (GCC) is an optimizing compiler produced by the GNU Project supporting various programming languages, hardware architectures and operating systems. The Free Software Foundation (FSF) distributes GCC as free software under the GNU General Public License (GNU GPL). GCC is a key component of the GNU toolchain and the standard compiler for most projects related to GNU and the Linux kernel. With roughly 15 million lines of code in 2019, GCC is one of the biggest free programs in existence. It has played an important role in the growth of free software, as both a tool and an example. When it was first released in 1987 by Richard Stallman, GCC 1.0 was named the GNU C Compiler since it only handled the C programming language. It was extended to compile C++ in December of that year. Front ends were later developed for Objective-C, Objective-C++, Fortran, Ada, D and Go, among others. The OpenMP and OpenACC specifications are also supported in the C and C ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Preprocessor Directive
In computer programming, a directive or pragma (from "pragmatic") is a language construct that specifies how a compiler (or other translator) should process its input. Directives are not part of the grammar of a programming language, and may vary from compiler to compiler. They can be processed by a preprocessor to specify compiler behavior, or function as a form of in-band parameterization. In some cases directives specify global behavior, while in other cases they only affect a local section, such as a block of programming code. In some cases, such as some C programs, directives are optional compiler hints, and may be ignored, but normally they are prescriptive, and must be followed. However, a directive does not perform any action in the language itself, but rather only a change in the behavior of the compiler. This term could be used to refer to proprietary third party tags and commands (or markup) embedded in code that result in additional executable processing that extend t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wcsstr
The C programming language has a set of functions implementing operations on strings (character strings and byte strings) in its standard library. Various operations, such as copying, concatenation, tokenization and searching are supported. For character strings, the standard library uses the convention that strings are null-terminated: a string of characters is represented as an array of elements, the last of which is a character (with numeric value 0). The only support for strings in the programming language proper is that the compiler translates quoted string constants into null-terminated strings. Definitions A string is defined as a contiguous sequence of code units terminated by the first zero code unit (often called the ''NUL'' code unit). This means a string cannot contain the zero code unit, as the first one seen marks the end of the string. The ''length'' of a string is the number of code units before the zero code unit. The memory occupied by a string is always ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
