Token pastingsuggest change
Token pasting allows one to glue together two macro arguments. For example,
frontback. A famous example is Win32’s
<TCHAR.H> header. In standard C, one can write
L"string" to declare a wide character string. However, Windows API allows one to convert between wide character strings and narrow character strings simply by
UNICODE. In order to implement the string literals,
TCHAR.H uses this
#ifdef UNICODE #define TEXT(x) L##x #endif
Whenever a user writes
TEXT("hello, world"), and UNICODE is defined, the C preprocessor concatenates
L and the macro argument.
L concatenated with
"hello, world" gives
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