It can still be a GOOD or recommended hash function. But a bad seed of 0 leading to collisions is considered a bug, a bad hash function. We test for internal secrets, if they will be multiplied with 0. This is
/*Declare the PTHash function.*/typedefsingle_phf<murmurhash2_64,//base hasherdictionary_dictionary,//encoder typetrue//minimal> pthash_type; pthash_type f;/*Build the function in internal memory.*/std::cout <<"building the function..."<< std::endl; f.build_in_internal_memory(keys....
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For any valuekey1of typeKeythat precedeskey2in the sequence and has the same hash value (value returned by the hash function),hash_comp(key2,key1) is false. The function must impose a total ordering on values of typeKey. The function supplied by hash_compare returnscomp(key2,key1),whe...
// hash_map_begin.cpp // compile with: /EHsc #include <hash_map> #include <iostream> int main( ) { using namespace std; using namespace stdext; hash_map <int, int> hm1; hash_map <int, int> :: iterator hm1_Iter; hash_map <int, int> :: const_iterator hm1_cIter; typedef pai...
// hash_set_begin.cpp // compile with: /EHsc #include <hash_set> #include <iostream> int main( ) { using namespace std; using namespace stdext; hash_set <int> hs1; hash_set <int>::iterator hs1_Iter; hash_set <int>::const_iterator hs1_cIter; hs1.insert( 1 ); hs1.insert(...
> RTE_HASH_MAX_PUSHES) return -ENOSPC; /* Set flag to indicate that this entry is going to be pushed */ bkt->flag[i] = 1; /* Need room in alternative bucket to insert the pushed entry */ ret = make_space_bucket(h, next_bkt[i], nr_pushes); /* * After recursive function. ...
operators (std::function) operators (std::optional) operators (std::pair) operators (std::time_point) operators (std::time_point) operators (std::tuple) operators (std::unique_ptr) operators (std::variant) Program support utilities setjmp SIGABRT SIGFPE SIGILL SIGINT SIGSEGV SIGTERM SIG_DFL ...
cpp คัดลอก NTSYSAPI NTSTATUS RtlHashUnicodeString( [in] PCUNICODE_STRING String, [in] BOOLEAN CaseInSensitive, [in] ULONG HashAlgorithm, [out] PULONG HashValue ); Parameters[in] StringA pointer to a UNICODE_STRING structure that contains the Unicode string to be converted to...
function Resize(uint i){ stateVar.length = i; } function Rewrite(uint i){ stateVar[i] = 0x10adbeef; } } 上面的代码就存在类似的 hash 碰撞问题。查看合约源代码可以看到balances字段只能通过Reslove接口进行访问,正常情况下balance中存放的值是无法被修改的。但是在这个合约中,调...