Gcc/10.2.0/cpp/ 005f 005fhas 005fcpp 005fattribute
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4.2.7 __has_cpp_attribute
The special operator __has_cpp_attribute (operand)
may be used
in ‘#if
’ and ‘#elif
’ expressions in C++ code to test whether
the attribute referenced by its operand
is recognized by GCC.
__has_cpp_attribute (operand)
is equivalent to
__has_attribute (operand)
except that when operand
designates a supported standard attribute it evaluates to an integer
constant of the form YYYYMM
indicating the year and month when
the attribute was first introduced into the C++ standard. For additional
information including the dates of the introduction of current standard
attributes, see SD-6: SG10 Feature Test Recommendations.