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A similar lexical scanner for C++ is flex++, which is included as part of the flex package. At the moment, flex supports generating code only for C and C++. The generated code does not depend on any runtime or external library except for a memory allocator (malloc or a user-supplied alternative) unless the input also depends on it. This can be useful in embedded and similar situations where traditional operating system or C runtime facilities may not be available.
The flex++ classes and code require a C++ compiler to create lexical and pattern-matching programs. The flex++ generated C++ scanner includes the header file FlexLexer.h, which defines the interfaces of the two C++ generated classes.
Read more about this topic: Flex Lexical Analyser