using a member const int to initialize a char array

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  • abubakarm@gmail.com
    #1

    using a member const int to initialize a char array

    Hi,

    If i have the following struct:

    struct t
    {
    const int x;// = 0;
    char name [ x ];

    };

    its gives an error saying that x is undefined. So I want to initialize
    x and use it to initalize other members. How do I do this? Or should I
    use some other way?

    Thanks,

    ...ab
    Tags: None
    • Leandro Melo
      #2
      Re: using a member const int to initialize a char array

      On 14 ago, 11:45, abubak...@gmail .com wrote:
      Hi,
      >
      If i have the following struct:
      >
      struct t
      {
        const int x;// = 0;
        char name [ x ];
      >
      };
      >
      its gives an error saying that x is undefined. So I want to initialize
      x and use it to initalize other members. How do I do this? Or should I
      use some other way?
      >
      Thanks,
      >
      ..ab
      Hi.

      You can use the following (don't use 0 however):

      struct A
      {
      static const int x = 10;
      char name [ x ];

      };

      --
      Leandro Melo

        Comment

        • Victor Bazarov
          #3
          Re: using a member const int to initialize a char array

          Leandro Melo wrote:
          On 14 ago, 11:45, abubak...@gmail .com wrote:
          >Hi,
          >>
          >If i have the following struct:
          >>
          >struct t
          >{
          > const int x;// = 0;
          > char name [ x ];
          >>
          >};
          >>
          >its gives an error saying that x is undefined. So I want to initialize
          >x and use it to initalize other members. How do I do this? Or should I
          >use some other way?
          >>
          >Thanks,
          >>
          >..ab
          >
          Hi.
          >
          You can use the following (don't use 0 however):
          >
          struct A
          {
          static const int x = 10;
          char name [ x ];
          >
          };
          If the value of 'x' is dynamic (determined only in run-time), then you
          can't use this. You need to either use a dynamic array or a std::vector
          for your 'name':

          struct A
          {
          const int x;
          std::vector<cha rname;
          A(int x) : x(x), name(x) {}
          };

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

            Comment

            • abubakarm@gmail.com
              #4
              Re: using a member const int to initialize a char array

              On Aug 14, 8:33 pm, Victor Bazarov <v.Abaza...@com Acast.netwrote:
              Leandro Melo wrote:
              On 14 ago, 11:45, abubak...@gmail .com wrote:
              Hi,
              >
              If i have the following struct:
              >
              struct t
              {
                const int x;// = 0;
                char name [ x ];
              >
              };
              >
              its gives an error saying that x is undefined. So I want to initialize
              x and use it to initalize other members. How do I do this? Or should I
              use some other way?
              >
              Thanks,
              >
              ..ab
              >
              Hi.
              >
              You can use the following (don't use 0 however):
              >
              struct A
              {
                static const int x = 10;
                char name [ x ];
              >
              };
              >
              If the value of 'x' is dynamic (determined only in run-time), then you
              can't use this.  You need to either use a dynamic array or a std::vector
              for your 'name':
              >
                   struct A
                   {
                       const int x;
                       std::vector<cha rname;
                       A(int x) : x(x), name(x) {}
                   };
              >
              V
              --
              Please remove capital 'A's when replying by e-mail
              I do not respond to top-posted replies, please don't ask
              Thank you guys !

              ..ab

                Comment

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