Preprocessor Directives Index

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This section contains C++ Preprocessor Directive topics.

Preprocessor directives are usually placed at the beginning of your source code, but they can legally appear at any point in a program. The preprocessor detects preprocessor directives (also known as control lines) and parses the tokens embedded in them.

Any line with a leading # is taken as a preprocessing directive, unless the # is within a string literal, in a character constant, or embedded in a comment. The initial # can be preceded or followed by whitespace (excluding new lines).

The preprocessor supports these directives: