Hi,

typesaft_cb_cast() is defined in typesaft_cb.h as:

    #define typesafe_cb_cast(desttype, oktype, expr)                  \
        __builtin_choose_expr(                                        \
                __builtin_types_compatible_p(__typeof__(0?(expr):(expr)), \
                                             oktype),                           
      \
                (desttype)(expr), (expr))

what is the point of that "0?(expr):(expr)" ?

Yubin
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