Function xmlXPathCompiledEvalToBoolean 

#[unsafe(no_mangle)]
pub unsafe extern "C" fn xmlXPathCompiledEvalToBoolean(
    comp: *mut c_void,
    ctxt: *mut _xmlXPathContext,
) -> c_int

int xmlXPathCompiledEvalToBoolean(xmlXPathCompExpr *comp, xmlXPathContext *ctxt).

Returns 1 / 0 for the boolean result, -1 on error.

SAFETY

• comp must be a compiled expression or NULL; ctxt a valid context.