<ciso646>
The <ciso646> header (from the C standard <iso646.h> header) does nothing in C++.
The C header defines a small number of macros, such as and for &&, but these macros are all reserved
keywords in C++. The <ciso646>
header exists only for the sake of completeness: every header in the C
standard has an equivalent in C++.
Not all C++ compilers correctly implement the alternative tokens
such as and. These compilers might
use <ciso646> to declare these
keywords as macros. For maximum portability to these nonconforming
compilers, include the <ciso646> header when you want to use
any alternative token keywords. See Chapter 1 for more information about the
alternative tokens.
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