the matlab way of preprocessor macros

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Andreas Lobinger
Andreas Lobinger 2012-6-5
评论： Bruno Luong 2018-9-21
To make my code more readable i'd like to move some hard coded values like b_index = find(all_user_state == 24); to something like b_index = find(all_user_state == UNCONNECTED); which i would do in C-style with #define.
What would you recommend in Matlab. I already thought about enum and collect the definitions in a def. struct, but would have then the problem to propagate this in all scopes.
  1 个评论
Bruno Luong
Bruno Luong 2018-9-21
The lack of preprocessing is to me a serious drawback in MATLAB. Define static, persistent variable(s) or in function will slow down greatly when one to access to it compared to a direct hard-code value.

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回答（2 个）

Wil Koenen
Wil Koenen 2018-9-21
Define a class containing the definitions, either using constant properties (1) or enumeration values (2).
Example (1)
classdef MyDef
properties(Constant)
UNCONNECTED = 24
CONNECTED = 25
% more definitions
end
end
Use as follows:
b_index = find(all_user_state == MyDef.UNCONNECTED)
Example (2)
classdef MyEnum < int32
enumeration
UNCONNECTED(24)
CONNECTED(25)
% more definitions
end
end
Use similarly:
b_index = find(all_user_state == MyEnum.UNCONNECTED)
Walter Roberson
Walter Roberson 2012-6-5
You can use static methods of a class.
You can define UNCONNECTED as a function that returns 24 .

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