Does "#if 1 func1 #else func2 #endif execute func1 during executation?

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  • Mr. Ken
    #1

    Does "#if 1 func1 #else func2 #endif execute func1 during executation?

    In the file I received, it defines two versions of same function with such
    statement.
    Is it during compilation, func1 will be used?

    #if 1
    func1.....
    #else
    func1.....
    #endif

    Sorry for the silly question but I am a little confused now.



    Tags: None
    • Bart
      #2
      Re: Does "#if 1 func1 #else func2 #endif execute func1 during executation?

      Mr. Ken wrote:
      In the file I received, it defines two versions of same function with such
      statement.
      Is it during compilation, func1 will be used?
      >
      #if 1
      func1.....
      #else
      func1.....
      #endif
      >
      Sorry for the silly question but I am a little confused now.
      Here the first version (#if 1) will be compiled and the second version
      (#else) will be ignored. The function will not be used at compile time.
      This is just a way to compile a different version of the function.

      Regards,
      Bart.

        Comment

        • Mr. Ken
          #3
          Re: Does "#if 1 func1 #else func2 #endif execute func1 during executation?


          "Bart" <bart.kowalski@ gmail.comwrote in message
          news:1157533929 .795501.57050@b 28g2000cwb.goog legroups.com...
          Mr. Ken wrote:
          In the file I received, it defines two versions of same function with
          such
          statement.
          Is it during compilation, func1 will be used?

          #if 1
          func1.....
          #else
          func1.....
          #endif

          Sorry for the silly question but I am a little confused now.
          >
          Here the first version (#if 1) will be compiled and the second version
          (#else) will be ignored. The function will not be used at compile time.
          This is just a way to compile a different version of the function.
          >
          Regards,
          Bart.
          >
          Thank you Bart.



            Comment

            • bharath.donnipad@gmail.com
              #4
              Re: Does &quot;#if 1 func1 #else func2 #endif execute func1 during executation?


              Mr. Ken wrote:
              "Bart" <bart.kowalski@ gmail.comwrote in message
              news:1157533929 .795501.57050@b 28g2000cwb.goog legroups.com...
              Mr. Ken wrote:
              In the file I received, it defines two versions of same function with
              such
              statement.
              Is it during compilation, func1 will be used?
              >
              #if 1
              func1.....
              #else
              func1.....
              #endif
              >
              Sorry for the silly question but I am a little confused now.
              Here the first version (#if 1) will be compiled and the second version
              (#else) will be ignored. The function will not be used at compile time.
              This is just a way to compile a different version of the function.

              Regards,
              Bart.
              >
              Thank you Bart.
              Code under #if 1 always compiles and gets embedded in to object file.
              You may find #if 0 in some code where in the code under it will not
              compile.

              - Bharath

                Comment

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