What's the name of the characteristic that defines if a function argument is IN, OUT, OPTional, etc?












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I'm modeling FFI formal arguments such as the ones that appear in a declaration like this one:



BOOL WINAPI CreatePipe(
_Out_ PHANDLE hReadPipe,
_Out_ PHANDLE hWritePipe,
_In_opt_ LPSECURITY_ATTRIBUTES lpPipeAttributes,
_In_ DWORD nSize
);


In principle an Argument is an object with a type, a name and this other characteristic of being out, in, etc. My question is: what's the name of this feature? direction, passing-mode, what?










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    0















    I'm modeling FFI formal arguments such as the ones that appear in a declaration like this one:



    BOOL WINAPI CreatePipe(
    _Out_ PHANDLE hReadPipe,
    _Out_ PHANDLE hWritePipe,
    _In_opt_ LPSECURITY_ATTRIBUTES lpPipeAttributes,
    _In_ DWORD nSize
    );


    In principle an Argument is an object with a type, a name and this other characteristic of being out, in, etc. My question is: what's the name of this feature? direction, passing-mode, what?










    share|improve this question



























      0












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      I'm modeling FFI formal arguments such as the ones that appear in a declaration like this one:



      BOOL WINAPI CreatePipe(
      _Out_ PHANDLE hReadPipe,
      _Out_ PHANDLE hWritePipe,
      _In_opt_ LPSECURITY_ATTRIBUTES lpPipeAttributes,
      _In_ DWORD nSize
      );


      In principle an Argument is an object with a type, a name and this other characteristic of being out, in, etc. My question is: what's the name of this feature? direction, passing-mode, what?










      share|improve this question
















      I'm modeling FFI formal arguments such as the ones that appear in a declaration like this one:



      BOOL WINAPI CreatePipe(
      _Out_ PHANDLE hReadPipe,
      _Out_ PHANDLE hWritePipe,
      _In_opt_ LPSECURITY_ATTRIBUTES lpPipeAttributes,
      _In_ DWORD nSize
      );


      In principle an Argument is an object with a type, a name and this other characteristic of being out, in, etc. My question is: what's the name of this feature? direction, passing-mode, what?







      naming-conventions






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      share|improve this question













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      share|improve this question








      edited Nov 24 '18 at 14:31







      Leandro Caniglia

















      asked Nov 24 '18 at 14:26









      Leandro CanigliaLeandro Caniglia

      8,85122035




      8,85122035
























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