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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 the C++ programming language, argument-dependent lookup (ADL), or argument-dependent name lookup, [1] applies to the lookup of an unqualified function name depending on the types of the arguments given to the function call. This behavior is also known as Koenig lookup, as it is often attributed to Andrew Koenig, though he is not its inventor ...
Some can issue warnings when they encounter trigraphs in source files. Borland supplied a separate program, the trigraph preprocessor ( TRIGRAPH.EXE ), to be used only when trigraph processing is desired (the rationale was to maximise speed of compilation).
Both the C99 and C++11 standards require at least one argument, but since C++20 this limitation has been lifted through the __VA_OPT__ functional macro. The __VA_OPT__ macro is replaced by its argument when arguments are present, and omitted otherwise. Common compilers also permit passing zero arguments before this addition, however.
Microsoft supports SEH as a programming technique at the compiler level only. MS Visual C++ compiler features three non-standard keywords: __try, __except and __finally — for this purpose. Other exception handling aspects are backed by a number of Win32 API functions, [2] for example, RaiseException to raise SEH exceptions manually.
For instance, the GNU C preprocessor can be made more standards compliant by supplying certain command-line flags. [2] Features of the preprocessor are encoded in source code as directives that start with #. Although C++ source files are often named with a .cpp extension, that is an abbreviation for "C plus plus"; not C preprocessor.
For example, C, C++ and their many derivatives support block comments delimited by /* and */ and line comments delimited by //. Other languages support only one type of comment. Other languages support only one type of comment.
PC-lint is a command-line tool for performing static code analysis, indicating suspicious or plain wrong issues in source code. PC-lint can be integrated into IDEs as an external tool, and the format of the warning messages can be adapted to the form the IDE is able to recognize and process.