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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_include: |