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__has_attribute
: <code>__has_attribute</code>__has_builtin
: <code>__has_builtin</code>__has_c_attribute
: <code>__has_c_attribute</code>__has_cpp_attribute
: <code>__has_cpp_attribute</code>__has_include
: <code>__has_include</code>_Pragma
: Pragmasdefined
: Defined#ifndef
: Once-Only Headers