dictionary - Search all keys with a prefix in map of C++ -


this question has answer here:

i'm using map store data. map has big data. want find keys has prefix, limit number of result items 50. want use fastest way search, not iterate through whole map , check, since map structured key-value container already.

for example, if have pairs: 

<"foo123", value>  <"foo234", value>  <"bar12", value>  <"foo456", value>   <"bar200", value>

if search "foo", suggest me 

foo123, foo234, foo456.

there 2 approaches come mind:

  • the first special container called trie, there no equivalent in c++ standard library, should able locate working versions easily.

  • the second approach uses fact in std::map, key "foo" sorts before "foo123". using upper_bound or lower_bound functions find starting range , there on use linear search.


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