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The type-generic macros that correspond to a function that is defined for only real numbers encapsulates a total of 3 different functions: float, double and long double variants of the function. The C++ language includes native support for function overloading and thus does not provide the <tgmath.h> header even as a compatibility feature.
Macros in PL/I, as well as in many assemblers, may have side effects, e.g., setting variables that other macros can access. Frame technology's frame macros have their own command syntax but can also contain text in any language. Each frame is both a generic component in a hierarchy of nested subassemblies, and a procedure for integrating itself ...
Variable-argument macros were introduced in 1999 in the ISO/IEC 9899:1999 revision of the C language standard, and in 2011 in ISO/IEC 14882:2011 revision of the C++ language standard. [1] Support for variadic macros with no arguments was added in C++20 and will be added in C23. [2] [3]
Python's is operator may be used to compare object identities (comparison by reference), and comparisons may be chained—for example, a <= b <= c. Python uses and, or, and not as Boolean operators. Python has a type of expression named a list comprehension, and a more general expression named a generator expression. [78]
X macros are an idiomatic usage of programming language macros for generating list-like structures of data or code. They are most useful when at least some of the lists cannot be composed by indexing, such as compile time. They provide reliable maintenance of parallel lists whose corresponding items must be declared or executed in the same order.
It is not to be confused with macros, the mechanism often found in programming languages (like C or Scala) to express substitution rules for program pieces. Macroprogramming originated in the context of wireless sensor network programming [ 3 ] [ 4 ] [ 5 ] and found renewed interest in the context of the Internet of Things [ 6 ] and swarm ...
The C preprocessor (CPP) is a text file processor that is used with C, C++ and other programming tools. The preprocessor provides for file inclusion (often header files), macro expansion, conditional compilation, and line control. Although named in association with C and used with C, the preprocessor capabilities are not inherently tied to the ...
Macros in C simply search through code and make textual replacements. In comparison, macros in lisp act like functions which work on expressions passed to them as if they were data. In this way, entirely new constructs can be created with macros. Examples include CLOS and the setf system which allows for any read function to work, essentially ...