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A conditional in the C preprocessor begins with a conditional directive: ‘#if’, ‘#ifdef’ or ‘#ifndef’.
| • Ifdef | ||
| • If | ||
| • Defined | ||
| • Else | ||
| • Elif | ||
• __has_attribute | ||
• __has_cpp_attribute | ||
• __has_c_attribute | ||
• __has_builtin | ||
• __has_feature | ||
• __has_extension | ||
• __has_include |