I would like to see a hash map example in C

Question

I don t know how to use the hash function in C    but I know that we can use hash map  Does g   support that by simply including  include  lt hash map gt   What is a simple example using hash map

User · Answer

hash map is a non-standard extension  unordered map is part of std  tr1  and will be moved into the std namespace for C  0x  http   en wikipedia org wiki Unordered map  28C 2B 2B 29

User · Answer

include  lt tr1 unordered map gt  will get you next-standard C   unique hash container  Usage   std  tr1  unordered map lt std  string int gt  my map  my map  answer     42  printf   The answer to life and everything is   d n   my map  answer

User · Answer

Wikipedia never lets down   http   en wikipedia org wiki Hash map  C 2B 2B

User · Answer

The current C   standard does not have  hash maps  but the coming C  0x standard does  and these are already supported  by g   in the shape of  unordered maps     include  lt unordered map gt   include  lt iostream gt   include  lt string gt  using namespace std   int main         unordered map  lt string  int gt  m      m  foo     42      cout  lt  lt  m  foo    lt  lt  endl      In order to get this compile  you need to tell g   that you are using C  0x   g   -std c  0x main cpp   These maps work pretty much as std  map does  except that instead of providing a custom operator lt    for your own types  you need to provide  a custom hash function - suitable functions are provided for types like integers and strings

User · Answer

The name accepted into TR1  and the draft for the next standard  is std  unordered map  so if you have that available  it s probably the one you want to use   Other than that  using it is a lot like using std  map  with the proviso that when if you traverse the items in an std  map  they come out in the order specified by operator lt   but for an unordered map  the order is generally meaningless

[c++] I would like to see a hash_map example in C++

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