[gnutls-devel] GnuTLS | Mark arguments of function gnutls_x509_crt_equals2 as const (!1000)
Development of GNU's TLS library
gnutls-devel at lists.gnutls.org
Tue May 21 15:26:06 CEST 2019
> But I have some concerns about change to asn1_find_node function signature in the linked MR.
'const' is a promise to the caller that the callee doesn't change it's contents (resp. the memory region a pointer points to) via this pointer. And in this it is absolutely fine to take a const argument and return a non-const, even if they both have identical values. The caller knows 'callee didn't change my data', but also the caller should be able to decide on it's own if the returning pointer is const or not. To avoid forcing the caller to use a cast, `asn1_find_node` returns a non-const value. The promise has been fullfilled by callee and after returning there is no promise any more.
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