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Using #pragma once allows the C preprocessor to include a header file when it is needed and to ignore an #include directive otherwise. This has the effect of altering the behavior of the C preprocessor itself, and allows programmers to express file dependencies in a simple fashion, obviating the need for manual management.
In other words, C++ does not have "submodules", meaning the . symbol which may be included in a module name bears no syntactic meaning and is used only to suggest the association of a module. As an example, std.compat is not a submodule of std, but is named so to indicate the association the module bears to the std module (as a "compatibility ...
Clang can compile a working HotSpot Java virtual machine. [26] 19 January 2012: Clang becomes an optional component in NetBSD cross-platform build system, but GCC is still default. [42] 29 February 2012: Clang 3.0 can rebuild 91.2% of the Debian archive. [43] 29 February 2012: Clang becomes default compiler in MINIX 3 [44] 12 May 2012
The assert macro implements runtime assertion. If the expression within it is false, the macro will print a message to stderr and call abort(), defined in stdlib.h.The message includes the source filename and the source line number from the macros __FILE__ and __LINE__, respectively. [2]
The inclusion may be logical in the sense that the resulting content may not be stored on disk and certainly is not overwritten to the source file. In the following example code, the preprocessor replaces the line #include <stdio.h> with the content of the standard library header file named 'stdio.h' in which the function printf() and other ...
C's offsetof() macro is an ANSI C library feature found in stddef.h. It evaluates to the offset (in bytes) of a given member within a struct or union type, an expression of type size_t . The offsetof() macro takes two parameters , the first being a structure or union name, and the second being the name of a subobject of the structure/union that ...
As many consider that including file content has significant drawbacks, newer languages have been designed without an include directive. Languages such as Java and C# support modularization via an import concept that allows a module to use the assets of another module at a conceptual level; not by including text.
In computer programming, a precompiled header (PCH) is a (C or C++) header file that is compiled into an intermediate form that is faster to process for the compiler.Usage of precompiled headers may significantly reduce compilation time, especially when applied to large header files, header files that include many other header files, or header files that are included in many translation units.