c++ - How to work with stl with functor wrap of function pointer? -


i need use unordered_map function pointer passing in, there workaround can make following code work?

struct eq_fun {     bool operator()(void* s1, const void* s2) const     {         return ( _cmp_fn((void*)s1,(void*)s2) == 0 );     }     int (*_cmp_fn)(void*, void*);     eq_fun(int (*fn)(void*, void*)):_cmp_fn(fn){} };  struct hash_fun {     size_t operator()(const void *p) const     {         return _hash_fn(p);     }     int (*_hash_fn)(const void*);     hash_fun(int (*fn)(const void*)):_hash_fn(fn){} };  unordered_map<void*,void*> *create(int (*h)(const void*),int (*cmp)(void*,void*)) {     return new unordered_map<void*,void*,hash_fun(h),eq_fun(cmp)>; }

sure

unordered_map<void*,void*,hash_fun, eq_fun> *create(int (*h)(const void*),int (*cmp)(void*,void*)) {     return new unordered_map<void*,void*,hash_fun,eq_fun>(0, hash_fun(h), eq_fun(cmp)); }

seems unordered_map not have constructor takes hash function , equaility function, i've added minimum number of buckets parameter value of zero. in case important point construct function objects separately , pass objects unordered_map constructor.


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