Map with string key and wstring[] value

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  • campesr
    #1

    Map with string key and wstring[] value

    Hi!

    I'd like to have a map with string keys, and wstring[] (arrays) values
    in c++.

    I thought map<string, wstring[]would work out, but it doesn't (at
    least I think so).

    Additionally I'd like to know what's the easiest way to populate such
    a map.

    Would - mymap["somekey"] = {L"My Unicode value one", L"My other
    unicode value"}; - work?

    Many thanks in advance.
    Tags: None
    • Victor Bazarov
      #2
      Re: Map with string key and wstring[] value

      campesr wrote:
      I'd like to have a map with string keys, and wstring[] (arrays) values
      in c++.
      You can't do that. The stored value has to satisfy certain requirements
      (be copy-constructible and assignable), and arrays don't.
      I thought map<string, wstring[]would work out, but it doesn't (at
      least I think so).
      >
      Additionally I'd like to know what's the easiest way to populate such
      a map.
      >
      Would - mymap["somekey"] = {L"My Unicode value one", L"My other
      unicode value"}; - work?
      No. The closest you can get to what you want is to have

      std::map<string , std::vector<wst ring

      ..

      V
      --
      Please remove capital 'A's when replying by e-mail
      I do not respond to top-posted replies, please don't ask

        Comment

        • campesr
          #3
          Re: Map with string key and wstring[] value

          On 23 Mai, 17:25, Victor Bazarov <v.Abaza...@com Acast.netwrote:
          campesr wrote:
          I'd like to have a map with string keys, and wstring[] (arrays) values
          in c++.
          >
          You can't do that. The stored value has to satisfy certain requirements
          (be copy-constructible and assignable), and arrays don't.
          >
          I thought map<string, wstring[]would work out, but it doesn't (at
          least I think so).
          >
          Additionally I'd like to know what's the easiest way to populate such
          a map.
          >
          Would - mymap["somekey"] = {L"My Unicode value one", L"My other
          unicode value"}; - work?
          >
          No. The closest you can get to what you want is to have
          >
          std::map<string , std::vector<wst ring
          >
          .
          >
          V
          --
          Please remove capital 'A's when replying by e-mail
          I do not respond to top-posted replies, please don't ask
          Thanks.

            Comment

            • Frank Birbacher
              #4
              Re: Map with string key and wstring[] value

              Hi!

              Victor Bazarov schrieb:
              No. The closest you can get to what you want is to have
              >
              std::map<string , std::vector<wst ring
              I suggest to try a deque because it offers better or equally good time
              complexity for all operations:

              map<string, deque<wstring

              :)

              Regards,
              Frank

                Comment

                • Victor Bazarov
                  #5
                  Re: Map with string key and wstring[] value

                  Frank Birbacher wrote:
                  Hi!
                  >
                  Victor Bazarov schrieb:
                  >No. The closest you can get to what you want is to have
                  >>
                  > std::map<string , std::vector<wst ring
                  >
                  I suggest to try a deque because it offers better or equally good time
                  complexity for all operations:
                  >
                  map<string, deque<wstring
                  >
                  :)
                  Except that std::deque does not have the same property that may be
                  important to the OP -- the data are not stored contiguously. The
                  storage of a vector can be easily used where an array can be used (like
                  passing it to a third-party library that expects an array via a pointer
                  to the first element).

                  V
                  --
                  Please remove capital 'A's when replying by e-mail
                  I do not respond to top-posted replies, please don't ask

                    Comment

                    • Frank Birbacher
                      #6
                      Re: Map with string key and wstring[] value

                      Hi!

                      Victor Bazarov schrieb:
                      Except that std::deque does not have the same property that may be
                      important to the OP -- the data are not stored contiguously.
                      Yes, right. I should have mentioned it. I'm sorry.

                      Frank

                        Comment

                        • campesr
                          #7
                          Re: Map with string key and wstring[] value

                          On 23 Mai, 22:33, Frank Birbacher <bloodymir.c... @gmx.netwrote:
                          Hi!
                          >
                          Victor Bazarov schrieb:
                          >
                          Except that std::deque does not have the same property that may be
                          important to the OP -- the data are not stored contiguously.
                          >
                          Yes, right. I should have mentioned it. I'm sorry.
                          >
                          Frank
                          OK. Many thanks to all of you.

                            Comment

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