iphone - Invalid conversion from const void* error -

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i running following code in .mm file , error: 

invalid conversion 'const void*' 'const __cfdata*'

i need run code in .mm. if change .m doesn't complain. why behaving this? compile iphone

  cfsocketnativehandle native; cfdataref nativeprop = cfreadstreamcopyproperty(thereadstream, kcfstreampropertysocketnativehandle);    if(nativeprop == null) {     if (errptr) *errptr = [self getstreamerror];     return no; }  cfindex nativeproplen = cfdatagetlength(nativeprop); cfindex nativelen = (cfindex)sizeof(native);  cfindex len = min(nativeproplen, nativelen);  cfdatagetbytes(nativeprop, cfrangemake(0, len), (uint8 *)&native); cfrelease(nativeprop);  cfsocketref thesocket = cfsocketcreatewithnative(kcfallocatordefault, native, 0, null, null); if(thesocket == null) {     if (errptr) *errptr = [self getsocketerror];     return no; }

cfreadstreamcopyproperty() returns cftyperef, typedef const void*, , c++ stricter conversions c (or objective-c). need cast explicitly here:

cfdataref nativeprop = (cfdataref)cfreadstreamcopyproperty(...);

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